Standard 30 mm Cage Plates


  • Compatible with 30 mm Cage Systems
  • Designed for use with ER Construction Rods
  • Mount Optics from Ø5 mm to Ø1" and Lens Tubes

CP35

Double Bore for
Ø1" Optics

CP36

Ø1.2" Double Bore for
SM1 Lens Tubes

CP32

Internal SM05 Threads

CP02F

SM1-Threaded
Dual Flexure Cage Plate

The CP02F Cage Plate’s flexure arm automatically compensates for cage rod misalignment to prevent cage plate binding.

Related Items


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Alternative Size Options
16 mm Cage Plates
30 mm Cage Plates
60 mm Cage Plates

The Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision-machined building blocks designed for high flexibility and quick, accurate alignment. The 30 mm cage plates featured below provide a means for mounting optical components with diameters ranging from 5 mm to 1" within a cage system. Many of the components are post mountable via an 8-32 (M4) tap in the cage plate (see below for details).

Cage System Compatibility: Thorlabs offers 16 mm, 30 mm, and 60 mm cage systems primarily designed for Ø1/2", Ø1", and Ø2" optical components, respectively. The parts on this page are compatible with our 30 mm cage system and utilize Ø6 mm ER cage rods.

Lens Tube with Cage Plate
Click to Enlarge
Many of Our Cage Plates Have Internal SM1 Threads
Cage Plate with HKTS-050 Thumbscrews
Click for Details

CP33 Cage Plate shown with HKTS-5/64 Hex Key Thumbscrews for Easy Adjustment
CP16 Cage Plate Application IdeaClick to Enlarge
CP42 Cage Plate Mounting an RMS-Threaded Objective in a 30 mm Cage System
Selection Guide
Item # Inner Bore Plate Thickness Post Mounting Cage Rod Locking Mechanisma
CP32(/M) SM05 Threadedb 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP33(/M) SM1 Threadedb 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP33T(/M) SM1 Threadedb 0.50" (12.7 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP02F(/M) SM1 Threadedb 0.35" (8.9 mm) 8-32 (M4)
1/4"-20 (M6)
Cap Screw Flexure, 5/64" (2.0 mm) Hex
CP08(/M) SM1 Threadedb 0.35" (8.9 mm) 8-32 (M4) Cap Screw Flexure, 3/32" (2.5 mm) Hex
CP4S SM1 Threadedb 0.16" (4.0 mm) N/A Setscrew, 0.05" (1.3 mm) Hex
CP6T SM1 Threadedb 0.24" (6.0 mm) N/A Setscrew, 5/64" (2.0 mm) Hex
CP8T SM1 Threadedb 0.31" (8.0 mm) N/A
CP42(/M) RMS (0.800"-36) Threaded 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP13(/M) C-Mount (1.00"-32) Threaded 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP14(/M) Ø1/2" Double Bore with Setscrew 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP35(/M) Ø1" Double Bore with Setscrew 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP06F(/M) Ø1" Double Bore with Setscrew 0.35" (8.9 mm) 8-32 (M4) Cap Screw Flexure, 5/64" (2.0 mm) Hex
DTCP1(/M) Ø1.2" Borec with Setscrew 0.41" (10.4 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP36 Ø1.2" Double Bored with Setscrew 0.35" (8.9 mm) N/A Setscrew, 5/64" (2.0 mm) Hex
CP37(/M) Ø35 mm Double Boree with Setscrew 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CP38
SM1 Threadedb 0.35" (8.9 mm) N/A Setscrew, 5/64" (2.0 mm) Hex
CP38T SM1 Threadedb 0.35" (8.9 mm) N/A Setscrew, 5/64" (2.0 mm) Hex
CP1Mxx
M6, M8, M9, M10, or M12 Threadedf 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CPNxx
M5.5, M6.5, M8.5, M9.5, M15.5,
0.750"-40, or M20.5 Threadedg
0.23" - 0.40"
(5.7 mm - 10.2 mm)
N/A Setscrew, 5/64" (2.0 mm) Hex
CP31(/M) None 0.35" (8.9 mm) 8-32 (M4) Setscrew, 5/64" (2.0 mm) Hex
CPG3 Cage Plate Gasket for Light-Tight Applications
ERCPS Cage Plate Stops for Precise Alignment
CPA1
CPA2
VRC4CPT
VRC6SCPT
Alignment Guides for the 30 mm Cage System
  • Replacement 0.05" (1.3 mm) hex screws (Item # SS4S025) are available for cage plates that use setscrews that have 4-40 threads.
  • In addition to being able to secure components with complementary threads, our SM05 (0.535"-40) and SM1 (1.035"-40) thread standards are designed to hold Ø1/2" and Ø1" optics, respectively.
  • This bore accepts male D4T dovetails.
  • This double bore diameter is matched to the outer diameter of our SM1 lens tubes.
  • This double bore diameter is matched to the outer diameter of our SM30 lens tubes and select free-space isolators.
  • Thread standard for a premounted aspheric or achromatic lens.
  • Thread standard for holding an unmounted aspheric, achromatic, or other small-diameter (≤Ø20 mm) optic.

Cage System Overview

The Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision-machined building blocks designed for high flexibility and accurate alignment.

16 mm, 30 mm, and 60 mm Cage System Standards

Thorlabs offers three standards defined by the center-to-center spacing of the cage assembly rods (see image below). The 16 mm cage, 30 mm cage, and 60 mm cage standards are designed to accommodate Ø1/2", Ø1", and Ø2" optics, respectively. Specialized cage plates that allow smaller optics to be directly inserted into our larger cage systems are also available.

Standard Threads

The flexibility of our Cage Assembly System stems from well-defined mounting and thread standards designed to directly interface with a wide range of specialized products. The three most prevalent thread standards are our SM05 Series (0.535"-40 thread), SM1 Series (1.035"-40 thread), and SM2 Series (2.035"-40 thread), all of which were defined to house the industry's most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards.


An example of the standard cage plate measurements determining cage system compatibility.
Standard Cage System Measurements
Cage System 16 mm 30 mm 60 mm
Thread Series SM05 SM1 SM2
Rod to Rod Spacing 16 mm (0.63") 30 mm (1.18") 60 mm (2.36")
Total Length 25 mm (0.98") 41 mm (1.60") 71.1 mm (2.80")
Cage Components
Cage Rods 16 mm These rods are used to connect cage plates, optic mounts, and other components in the cage system. The SR Series Cage Rods are compatible with our 16 mm cage systems, while the 30 mm and 60 mm cage systems use ER Series Cage Rods.
30 mm
60 mm
Cage Plates 16 mm These serve as the basic building blocks for a cage system. They may have SM-threaded central bores, smooth bores sized for industry standard optics or to accommodate the outer profile of our SM Series Lens Tubes, or specialized bores for other components such as our FiberPorts.
30 mm
60 mm
Optic Mounts 16 mm Thorlabs offers fixed, kinematic, rotation, and translation mounts specifically designed for our Cage Systems.
30 mm
60 mm
Cage Cubes 16 mm These cubes are useful for housing larger optical components, such as prisms or mirrors, or optics that need to sit at an angle to the beam path, such as beamsplitters. Our cage cubes are available empty or with pre-mounted optics.
30 mm
60 mm
Replacement Setscrews Replacement setscrews are offered for our 16 mm (SS4B013, SS4B025, and SS4B038) and 30 mm (SS4MS5 and SS4MS4) cage systems products.
Post and Breadboard Mounts and Adapters Mounting options for cage systems can be found on our Cage System Construction pages. Cage Systems can be mounted either parallel or perpendicular to the table surface.
Size Adapters Cage System Size Adapters can be used to integrate components from different cage system and threading standards.
Specialized Components Thorlabs also produces specialized cage components, such as Filter Wheels, a HeNe Laser Mount, and a FiberPort Cage Plate Adapter, allowing a wide range of our products to be integrated into cage-mounted optical systems. Explore our Cage Systems Visual Navigation Guide to see the full range of Thorlabs' cage components.

Posted Comments:
Basilio Javier Garcia  (posted 2021-05-21 06:58:09.243)
One possible response to myself: insert a CML05 5mm c-mount spacer This is about the space deficit I have seen.
Basilio Javier Garcia  (posted 2021-05-20 09:56:54.97)
I'm interested in the idea suggested by thorlabs: - Coupling of a C-mount camera body to 30mm cage system using CMT2, CP13(/M), SM1A9 and AC254-045-A-ML (see CP13 page) Taking into account the standard back flange distance (focal plane/sensor to lens mount distance) of 17.526 mm and the pdf drawings of the above components, I have found the whole set can not be focused to infinity without compromising its stability (threads nearly loosened). Please could you confirm the ability to focus to infinity or do I have to reduce the achromat focal length for that purpose? Thanks
cdolbashian  (posted 2021-06-04 11:10:36.0)
Thank you for reaching out to us with your inquiry! I have contacted you directly regarding your design-specific concerns.
Tom Dzelzainis  (posted 2021-02-01 16:11:32.87)
Hi, The description of the CP36 says that it is not post mountable as the threaded hole would interfere with the central bore. How come the CP37 can be made post mountable? This part has the same outer dimensions as the CP36, but has a larger bore. The alternatives for post mounting of an SM1 tube are not cage compatible and therefore not suitable for most cage set-ups. The absence of a post mountable cage plate that can hold an SM1 tube without using the threading is a major problem with this range. Many thanks, Tom.
YLohia  (posted 2021-03-18 02:27:46.0)
Hello, thank you for your feedback. The CP37 can be used as a cage support, but the tap is not functional when mounting a 30mm lens tube. The stud length on the TR posts ranges between 0.180" and 0.210". If at the 0.210" long dimension, it would crash into the lens tube and cause damage so the mounting option was not added. This same issue exists on the CP37 when mounting a 30mm lens tube, but this was not the initial intent of product. Our engineering team will look at a way to modify the design of the CP36 to accommodate a mounting hole.
user  (posted 2021-01-08 14:23:42.857)
It would be great to have a common SM1 threaded cage plate like CP33/M available with a fine thread adjuster, similar to CP1LM9.
llamb  (posted 2021-01-09 10:08:16.0)
Thank you for your feedback. We will consider your suggestion further. For the time being, perhaps our SM1Z or CT1 cage translators could also be of interest to you for your application.
Rowan MacQueen  (posted 2020-10-27 16:17:13.35)
Hi, This item (and the metric version of it) isn't showing up on the e.biss system at my institution, Helmholtz-Zentrum Berlin. I'd quite like to buy it otherwise.
YLohia  (posted 2020-10-28 09:26:41.0)
Hello, stock items can be purchased by contacting our German Sales Team at sales.de@thorlabs.com or +49 (0) 8131-5956-0.
Fang Xian  (posted 2020-10-26 20:15:22.29)
Hi,I want to know the diameter of the hole in the middle of CP32 in millimeters.
YLohia  (posted 2020-10-26 11:26:31.0)
The SM05 threaded hole in the middle of the CP32 has a min minor diameter for 0.508", which is 12.9032 mm. The clear aperture is 10.9mm with the retaining ring installed. More specs for this internal thread can be found here: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1535&tabname=Threading%20Specs
Wance Wang  (posted 2020-01-08 12:29:43.213)
Hi, I am building parallel 30mm cages (2 30mm cages sharing 2 common rods). I wonder if you have 30mm plate which has 6 holes for this parallel cages? Of course one can build it with 2 CP33 plates (for example), but I feel an integrated plate is better. In addition, vertical mount UBP2 also only has 4 holes so it can't mount those parallel cages, and I can't make 2 of them parallel with a 30mm spacing. If there is a vertical plate with 6 30mm hole, it would be great. Thank you!
YLohia  (posted 2020-01-08 03:20:22.0)
Hello, thank you for contacting Thorlabs. I have reached out to you directly to discuss the possibility of offering this.
John Bragg  (posted 2019-12-16 11:31:12.52)
I need the RoHS Compliance Certificate for CP33. It is not downloadable from the website. Thank you, John Bragg jbragg@cytonome.com
YLohia  (posted 2019-12-16 04:19:07.0)
Thank you for contacting Thorlabs. I have reached out to you with this information.
Bolin Liao  (posted 2019-07-29 21:35:23.807)
Hi, I'm wondering what kind of anodization was used for the surface finish of the cage plates? Is it high-vacuum (1e-6 torr level) compatible? If not, could you custom-fabricate the cage plates with stainless steel? Thanks! Best, Bolin
YLohia  (posted 2019-07-30 11:52:55.0)
Hello Bolin, thank you for contacting Thorlabs. The cage plates are 6061-T6 aluminum anodized and are not rated for high-vacuum use. For custom item quotes, please email techsupport@thorlabs.com.
user  (posted 2019-04-02 11:21:49.95)
Hello, I imported the step file for this item into Autocad and am trying now to export it as a different file type. Autocad says that this model is not "water tight." The CP02T worked fine. Do you have a model that is water tight? Best, Jon
llamb  (posted 2019-04-11 09:58:45.0)
Hi Jon, thank you for your feedback. I have reached out to you directly to troubleshoot, and we will look into updating the web files accordingly.
Cedric Hurth  (posted 2019-04-02 04:47:02.66)
I would like to submit a customer-inspired design for a modified CP4S, how do I proceed? Thank you!
llamb  (posted 2019-04-03 09:42:46.0)
Thank you for your interest! For any product suggestions or improvements, you can email techsupport@thorlabs.com. We are always happy to receive product feedback and new product ideas. I have reached out to you by email in this case to discuss your design further.
pszwaykowski  (posted 2017-08-17 14:26:40.89)
What are the chances to get a CP01 with clamping features like CP08? I need to modify CP01 plate to accommodate our own creations but can not use the set screws to lock the plate in place. Tightening these screws causes small translation of the plate that can not be easily controlled.
tfrisch  (posted 2017-08-28 11:08:53.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly about details to quote this custom plate.
ludoangot  (posted 2017-04-10 10:40:26.51)
I have a suggestion for new cage plate: one plate able to receive rods from either (or both) of your 30mm and 60mm cage system (e.g. as the CP06 for 30mm, LCP01 for 60mm, LCP02 for both) and offering threaded mounting holes (as several of your surface mounting plate, ex. as the detachable mounting plate of your C1001). This would allow to mount, for example, an industrial or scientific camera at the end or in the middle of a cage. The plate would look like your LCP03 (case of your 60mm cage) but thinner and with many threaded (and unthreaded) holes.
tfrisch  (posted 2017-04-27 02:19:41.0)
Hello, thank you for contacting Thorlabs. I will reach out to you directly about your application. It would be helpful if you could send a sketch that we could use in our discussion.
ludoangot  (posted 2016-09-30 15:05:23.23)
I have several of your cage plates, but today I am looking for one with a 30mm inner bore, and you don't seem to offer any. Could you consider making such dimension, or, as an alternative, offer a mounting adapter (sleeve) so a 30mm diameter element (many 3rd party lenses are 30mm in diameter) could fit in one of your cage plate (e.g. the one with 1.2" bore)?
jlow  (posted 2016-10-03 01:39:35.0)
Response from Jeremy at Thorlabs: Yes we can make this. I will contact you directly about quoting this.
eddy.porter  (posted 2015-04-21 08:32:23.963)
What is the material and finish of CP01/M Cage Plate? We intend to machine and re-finish the part. Thanks Eddy Porter
jlow  (posted 2015-04-22 04:08:23.0)
Response from Jeremy at Thorlabs: The cage plate is made from 6061 aluminum that is anodized with a Type 2 anodization.
gir  (posted 2013-05-14 21:54:02.91)
FYI: the #8-32 threaded hole on the CP06 is shown in the AutoCAD PDF file, but not in the SolidWorks model.
tcohen  (posted 2013-05-15 12:45:00.0)
Response from Tim at Thorlabs: Thank you for pointing this out! We will fix this shortly.
david.baddeley  (posted 2013-05-14 13:17:16.063)
Would you consider offering cage plates with 4-40 threaded holes (to accommodate screws on the ends of cage rods) the drilled and tapped on the sides to allow a second cage system to be attached at right angles. I've previously had this done on existing plates in a local machine shop, and have found it to be a very efficient way of making 3D cage structures. I now have less access to machining facilities, and though it might be worth suggesting as a product variation. Ideally this would also involve a slight increase (~ 1-2 mm in the width of the plate) as the length of the rod threads is such that they will often engage the rod running through the plate before the end of the rod at right angles is flush with the cage plate surface. Cage cubes and right angle rods (ER90C) don't work for my application as the position of the right angle needs to be adjustable. Cross couplers (C1A) won't work as they are too large (I'm putting a KC45D gimbal mirror at the intersection of the two cage systems to deflect the beam from one to the other and it won't fit with the C1As there). many thanks, David
cdaly  (posted 2013-05-16 15:37:00.0)
Response from Chris at Thorlabs: Thank you for your suggestion. I will suggest this within our internal discussions. As a quick solution though, would it be possible for you to use C1A, C2A, or ER90C to achieve this as well?
cdaly  (posted 2013-03-06 17:59:00.0)
Response from Chris at Thorlabs: We haven't specifically tested the gasket in vacuum, but I was able to find another resource that tested the material. The CPG3 is made of Buna-N, which at an exposure to 10^-6 Torr for 336 hours, experienced a weight loss ratio was 1.06, which is a pretty large value as far as outgassing is concerned. At the moment, we do not make a delrin version. These are intended for light tight purposes in a non-vacuum environment. For general purposes the compressiblity of the material is ideal as it allows it to conform to the objects it is between.
jlow  (posted 2012-08-09 09:33:00.0)
Response from Jeremy at Thorlabs: Thank you for your feedback. The CPG3 is designed with a large aperture in mind. It is unfortunate that it does not work with the CP08 because of the slits of the side. I have submitted this feedback to our engineering group and we will look into improving this.
matthias.sauer  (posted 2012-08-07 13:48:39.0)
The gasket is not covering the slits of a CP08 cage plate. To fulfill its intended use, it would be helpful if it optically sealed one side of the cage plate from the other.
tcohen  (posted 2012-05-01 12:23:00.0)
Response from Tim at Thorlabs: Both the cage system and traditional posts have their uses. The cage system provides an easy way to quickly align along a common optical axis. Posts and post holders allow the flexibility to quickly drop in and adjust the height of a component. Different setups may benefit from one over the other but they are also subject to personal preference. If there is ever a question of which would be preferred, please contact us at techsupport@thorlabs.com where an Applications Engineer will be able to discuss your application and the suitability of the products to fit into your ideal setup.
Carlos.Gulien  (posted 2012-04-26 22:33:16.0)
Yes, can you provide your professional opinion on using a cage system vs. using standard posts, post holders, pedestals and so on...can you comment on when I should use each system and what are the pros and cons of each, like ease of use vs. stability vs cost vs anything else you have experienced as a scientist. What system are most people using these days? I tend to trust the "herd" if you know what I mean.
apalmentieri  (posted 2010-02-08 08:55:52.0)
A response from Adam at Thorlabs to Dan: Thank you for your feedback. This does count as customer inspired and I have informed our mechanics division of your feedback. I agree that this would make a good addition to the product line. If it is added, we would offer you a prototype to test out the new design. In the meantime, we can offer this item as a custom.
flickingerd  (posted 2010-02-04 18:19:11.0)
I wish you had a product like CP06, but for a 2in optic in the 60mm cage system. I can use the FMP2 for my design, but it seems like it will be relatively very wobbly since it doesnt look beefy enough. Does this count as "customer inspiration"?
Laurie  (posted 2008-08-07 09:25:07.0)
Response from Laurie at Thorlabs to xavier.schwab: The new metric indicator (i.e., the dot) is a very recent addition to our metric mounts. Unfortunately, this new information must have been added to our website prior to stock depletion of the ones without a metric indicator. There is no difference in the physical functionality of the product. We are merely trying to make it easier/quicker for our customers to look at our parts and know whether they are imperial or metric. That being said, if you would like to return your CP02/M and receive one with a metric indicator, please feel free to speak to our RMA department. We apologize for any confusion or inconvenience we may have caused.
xavier.schwab  (posted 2008-08-07 07:17:31.0)
Dear Mr., dear Madam, I will purchase new cage system products. I have a question about the dot near a thread which may signified "Metric". In our actual CP02, we have no dot near the thread but it is a Metric thread. As we would like to keep the same standard, could tell me if its normal? Best regards, X. Schwab
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SM05-Threaded Cage Plate

Cage System SM05 Lens Tube
Click to Enlarge

The CP32 cage plate allows for
Ø1/2" lens tubes to be integrated
in 30 mm cage systems.
  • Directly Mounts Ø1/2" Optical Components Within a 30 mm Cage System Assembly
  • 0.35" (8.9 mm) Thick
  • Tapped with Our Standard SM05 Thread (0.535"-40)
  • Post Mountable via 8-32 (M4) Tapped Hole

The CP32(/M) SM05-threaded cage plate is 0.35" (8.9 mm) thick with a center-located SM05 (0.535"-40) threaded bore that is compatible with our popular Ø1/2" lens tubes. The bore can also directly accept a Ø1/2" optic up to 0.2" (5 mm) thick. Two SM05RR retaining rings are included.

Each cage rod through hole is accompanied by a side-located M4 locking setscrew, which can be secured using a 5/64" (2.0 mm) hex key. For additional convenience, an 8-32 (M4) tapped hole is provided for post mounting applications.

For those looking to convert from the 30 mm to the 16 mm cage system standard, Thorlabs offers a similar product, the SP15(/M) cage plate.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CP32 Support Documentation
CP32SM05-Threaded 30 mm Cage Plate, 0.35" Thick, Two Retaining Rings, 8-32 Tap
$20.66
Today
+1 Qty Docs Part Number - Metric Price Available
CP32/M Support Documentation
CP32/MSM05-Threaded 30 mm Cage Plate, 0.35" Thick, Two Retaining Rings, M4 Tap
$20.66
Today
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SM1-Threaded Standard Cage Plates


Click to Enlarge

An 8-32 mounting hole allows the CP33T Cage Plate to be mounted to a Ø1/2" post.
  • Directly Mounts Optical Components Within a 30 mm Cage System Assembly
  • 2 Thicknesses Available: 0.35" (8.9 mm) and 0.50" (12.7 mm)
  • Tapped with Our Standard SM1 Thread (1.035"-40)
  • Post Mountable via 8-32 (M4) Tapped Hole

The CP33(/M) cage plate is 0.35" (8.9 mm) thick and provides a center-located SM1 (1.035"-40) threaded bore that is compatible with our popular Ø1" lens tubes. The SM1-threaded bore can also directly accept a Ø1" optic up to 0.2" (5 mm) thick. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured using a 5/64" (2.0 mm) hex key or balldriver.

The CP33T(/M) cage plate is 0.50" (12.7 mm) thick and has a center-located SM1-threaded hole that directly accepts optics up to 0.35" (8.9 mm) thick. It features an extra-thick design with double locking setscrews that enables two extension rods to be inserted end-to-end and firmly locked into place, providing a rigid connection between two cage system subassemblies. The cage rod locking setscrews can be tightened using a 5/64" (2.0 mm) hex key or balldriver.

Each cage plate includes two SM1RR retaining rings and has an 8-32 (M4) tapped hole for post mounting.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CP33 Support Documentation
CP33SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
$19.09
Today
CP33T Support Documentation
CP33TSM1-Threaded 30 mm Cage Plate, 0.50" Thick, 2 Retaining Rings, 8-32 Tap
$26.29
Today
+1 Qty Docs Part Number - Metric Price Available
CP33/M Support Documentation
CP33/MSM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
$19.09
Today
CP33T/M Support Documentation
CP33T/MSM1-Threaded 30 mm Cage Plate, 0.50" Thick, 2 Retaining Rings, M4 Tap
$26.29
Today
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SM1-Threaded Dual Flexure Cage Plate


Click to Enlarge
The CP02F(/M) Cage Plate offers a 1/4"-20 (M6) tap for mounting on our Ø1" Posts.

Click to Enlarge

Cage rod arms can flex to compensate for cage rod misalignment due to tolerance stacking.
  • Self-Aligning Cage Rod Arms Eliminate Cage Plate Binding
  • Tapped with Our Standard SM1 Thread (1.035"-40)
  • Directly Mounts Optical Components Within a 30 mm Cage System Assembly
  • Post Mountable via 8-32 (M4) and 1/4"-20 (M6) Tapped Holes

The CP02F(/M) Flexure Cage Plate features a flexure arm design for locking onto 30 mm cage rods. This design compensates for the tolerance stacking effects common in cage systems, ensuring that the cage plate never binds or sticks within a constructed cage segment. The cage plate's orthogonal flexure arms remain rigid when handled, but will flex slightly to provide compensation for rod misalignment when installed within a constructed cage segment. This unique feature is illustrated in the diagram to the right. In contrast with the standard setscrew retention method of the CP33 Cage Plate, each CP02F arm clamps onto cage rods using a separate flexure clamp that increases holding force and cage plate rigidity.

Like our CP33(/M) cage plate, it is 0.35" (8.9 mm) thick and provides a center-located SM1 (1.035"-40) threaded bore that is compatible with our popular Ø1" lens tubes. The center-threaded bore of the CP02F(/M) can also directly accept a Ø1" optic up to 0.19" (4.8 mm) thick. Two SM1RR retaining rings are included. The cap screw on each flexure cage rod through hole can be tightened using a 5/64" (2.0 mm) hex key or Thorlabs' HKTS-5/64 Hex Key Thumbscrews.

For additional convenience, 8-32 (M4) and 1/4"-20 (M6) tapped holes are provided on opposite sides of the cage plate for post mounting applications. For Ø1" optics thicker than 0.125" (3.2 mm), we offer the CP06F(/M) Cage Plate with a Ø1" Double Bore.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP02F Support Documentation
CP02FSM1-Threaded 30 mm Flexure Cage Plate, 0.35" Thick, 2 Retaining Rings, Imperial
$25.60
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CP02F/M Support Documentation
CP02F/MSM1-Threaded 30 mm Flexure Cage Plate, 0.35" Thick, 2 Retaining Rings, Metric
$25.60
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SM1-Threaded Cage Plate with Flexure Clamps

  • Directly Mounts Bulk Optics Within a 30 mm Cage System Assembly
  • Tapped with Our Standard SM1 Thread (1.035"-40)
  • Post Mountable Via 8-32 (M4) Tapped Hole
  • Thickness: 0.35" (8.9 mm)

The CP08(/M) Cage Plate provides a more stable clamping mechanism for cage rods than our popular CP33(/M) Cage Plate. It also offers a center-located SM1 (1.035"-40) threaded bore and 8-32 (M4) mounting hole. This cage plate uses a flexure clamping mechanism that increases the surface area in contact with the ER rods. The CP08(/M) uses four side-located 3/32" (2.5 mm) hex cap screws with for securing the cage rods. The central bore of the CP08(/M) can also directly accept a Ø1" optic up to 0.2" (5 mm) thick using two SM1RR retaining rings. One SM1RR retaining ring is included.

Thorlabs also offers the CP02F(/M) Flexure Cage Plate (sold above) with self-aligning cage rod arms that eliminate cage plate binding.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP08 Support Documentation
CP08SM1-Threaded 30 mm Cage Plate with Flexure Clamping, 1 Retaining Ring, 8-32 Tap
$23.04
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CP08/M Support Documentation
CP08/MSM1-Threaded 30 mm Cage Plate with Flexure Clamping, 1 Retaining Ring, M4 Tap
$23.04
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SM1-Threaded 30 mm Cage Plate, Not Post Mountable

Optical Cage Plate
Click to Enlarge
The CP4S cage plate mounting an SM1FC FC/PC Fiber Adapter Plate within a cage system.
  • Directly Mount Optical Components Within a 30 mm Cage System Assembly
  • 3 Thicknesses Available: 4.0 mm (0.16"), 6.0 mm (0.24"), and 8.0 mm (0.31")
  • Tapped with Our Standard SM1 Thread (1.035"-40)
  • Not Post Mountable

At 4.0 mm (0.16"), 6.0 mm (0.24"), and 8.0 mm (0.31") thick, respectively, the CP4S, CP6T, and CP8T are the thinnest cage plates we offer. They have a center-located SM1 (1.035"-40) threaded bore that is compatible with our SM1 threaded optomechanical components. These plates allow the close spacing of optical components within a cage system. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured using a 0.05" (1.3 mm) hex key for the CP4S cage plate or a 5/64" (2.0 mm) hex key for the CP6T and CP8T cage plates. Unlike the standard cage plates sold above, these cage plates do not offer an 8-32 (M4) tapped hole for post mounting.

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CP4S Support Documentation
CP4SCustomer Inspired! SM1-Threaded 30 mm Cage Plate, 4.0 mm Thick
$21.71
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CP6T Support Documentation
CP6TSM1-Threaded 30 mm Cage Plate, 6.0 mm Thick
$22.31
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CP8T Support Documentation
CP8TSM1-Threaded 30 mm Cage Plate, 8.0 mm Thick
$22.67
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RMS-Threaded Cage Plate

CP16 Cage Plate Application Idea
Click to Enlarge

CP42 Cage Plate Mounting an RMS-Threaded Objective in a 30 mm Cage System
  • Integrates RMS Components with a 30 mm Cage System Assembly
  • Tapped with RMS Threading (0.800"-36)
  • Post Mountable via 8-32 (M4) Tap
  • Thickness: 0.35" (8.9 mm)

The CP42(/M) Cage Plate allows for RMS-threaded components, including many of our microscope objectives, to be incorporated with our 30 mm cage systemEach cage rod through hole is accompanied by a side-located locking M4 setscrew, which can be secured using a 5/64" (2.0 mm) balldriver or hex key. The CP42(/M) can also be post mounted using the 8-32 (M4) threaded hole on the bottom.

We also offer the RMSRR RMS Retaining Ring (not included) for positioning components within the cage plate.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP42 Support Documentation
CP42RMS-Threaded 30 mm Cage Plate, 0.35" Thick, 8-32 Tap
$35.99
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CP42/M Support Documentation
CP42/MRMS-Threaded 30 mm Cage Plate, 0.35" Thick, M4 Tap
$35.99
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C-Mount-Threaded Cage Plate

CP13 Cage Plate Application IdeaClick to Enlarge
View Imperial Product List
Item #QtyDescription
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
CMT21C-Mount (1.00"-32) Coupler, External Threads, 0.5" Long
CP131C-Mount-Threaded 30 mm Cage Plate, 0.35" Thick, 8-32 Tap
SM1A91Adapter with External C-Mount Threads and Internal SM1 Threads, 4.4 mm Spacer
AC254-045-A-ML1f=45 mm, Ø1" Achromatic Doublet, SM1-Threaded Mount, ARC: 400-700 nm
ER8-P41Cage Assembly Rod, 8" Long, Ø6 mm, 4 Pack

View Metric Product List
Item #QtyDescription
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
CMT21C-Mount (1.00"-32) Coupler, External Threads, 0.5" Long
CP13/M1C-Mount-Threaded 30 mm Cage Plate, 0.35" Thick, M4 Tap
SM1A91Adapter with External C-Mount Threads and Internal SM1 Threads, 4.4 mm Spacer
AC254-045-A-ML1f=45 mm, Ø1" Achromatic Doublet, SM1-Threaded Mount, ARC: 400-700 nm
ER8-P41Cage Assembly Rod, 8" Long, Ø6 mm, 4 Pack

The CP13(/M) Cage Plate can integrate cameras into a 30 mm cage system.
  • Integrates C-Mount Components with a 30 mm Cage System Assembly
  • Tapped with C-Mount Threading (1.00"-32)
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Thickness: 0.35" (8.9 mm)

The CP13(/M) Cage Plate allows for C-Mount-threaded components to be incorporated with our 30 mm cage system. Possible components include our line of C-Mount extension tubesCMOS/CCD cameras, and camera lensesEach cage rod through hole is accompanied by a side-located locking M4 setscrew, which can be secured using a 5/64" (2.0 mm) balldriver or hex key. The CP13(/M) can also be post mounted via an 8-32 (M4) tapped mounting hole.

We also offer the CMRR C-Mount Retaining Ring (not included) for positioning components within the cage plate. This cage plate has an inner diameter that is too small to accept Ø1" (Ø25.4 mm) or Ø25 mm (Ø0.98") optics. Optics of thickness less than 0.18" (4.5 mm) with diameters between 0.87" and 0.97" can be secured inside this cage plate using two retaining rings.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP13 Support Documentation
CP13Customer Inspired! C-Mount-Threaded 30 mm Cage Plate, 0.35" Thick, 8-32 Tap
$35.99
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CP13/M Support Documentation
CP13/MCustomer Inspired! C-Mount-Threaded 30 mm Cage Plate, 0.35" Thick, M4 Tap
$35.99
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Standard Cage Plate for Ø1/2" Optics

30 mm Cage Plate
Click to Enlarge

CP14 mounting a Ø1/2" mirror in a cage system.
  • Double Bore for Ø1/2" Optics
  • Directly Mounts Optical Components Within a 30 mm Cage System Assembly
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Nylon-Tipped Locking Setscrew

This CP14(/M) Cage Plate allows a Ø1/2" mirror or other optical component to be aligned in our 30 mm cage system. The double-bored mounting area provides two lines of stable contact to hold the optic. It features a top-located, nylon-tipped setscrew, which can be fastened with a 5/64" (2.0 mm) balldriver or hex key to secure the optic in place. The optic must be at least 0.15" (3.8 mm) thick in order to be properly mounted in the cage plate. The cage plate also has a bottom-located 8-32 (M4) tap for post mounting. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured using a 5/64" (2.0 mm) balldriver or hex key.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP14 Support Documentation
CP14Customer Inspired! 30 mm Cage Plate with Ø1/2" Double Bore, 8-32 Tap
$25.62
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CP14/M Support Documentation
CP14/MCustomer Inspired! 30 mm Cage Plate with Ø1/2" Double Bore, M4 Tap
$25.62
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Standard Cage Plate for Ø1" Optics

Fiber Collimation
Click to Enlarge

CP35 Cage Plate Mounting a Ø1" Lens in Fiber Focusing Application
  • Double Bore for Ø1" Optics
  • Directly Mounts Optical Components Within a 30 mm Cage System Assembly
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Nylon-Tipped Locking Setscrew

This CP35(/M) Cage Plate allows a Ø1" mirror or other optical component to be aligned in our 30 mm cage system. The double-bored mounting area provides two lines of stable contact to hold the optic. It features a top-located, nylon-tipped setscrew, which can be fastened with a 5/64" (2.0 mm) balldriver or hex key to secure the optic in place. The optic must be at least 0.15" (3.8 mm) thick in order to be properly mounted in the cage plate. The cage plate also has a bottom-located 8-32 (M4) tap for post mounting. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured using a 5/64" (2.0 mm) balldriver or hex key.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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CP35 Support Documentation
CP3530 mm Cage Plate with Ø1" Double Bore, 8-32 Tap
$21.53
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CP35/M Support Documentation
CP35/M30 mm Cage Plate with Ø1" Double Bore, M4 Tap
$21.53
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Dual Flexure Cage Plate for Ø1" Optics

Flexure Cage Plates
Click to Enlarge
Two Flexure Cage Plates in a 30 mm Cage System
Flexure Cage Plate Diagram
Click to Enlarge

Cage rod arms can flex to compensate for cage rod misalignment due to tolerance stacking.
  • Self-Aligning Cage Rod Arms Eliminate Cage Plate Binding
  • Double Bore for Ø1" Optics
  • Directly Mounts Optical Components Within a 30 mm Cage System Assembly
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Nylon-Tipped Locking Setscrew

The CP06F(/M) Flexure Cage Plate features a flexure arm design for locking onto 30 mm cage rods. This design compensates for the tolerance stacking effects common in cage systems, ensuring that the cage plate never binds or sticks within a constructed cage segment. The cage plate's orthogonal flexure arms remain rigid when handled, but will flex slightly to provide compensation for rod misalignment when installed within a constructed cage segment. This unique feature is illustrated in the diagram to the right. In contrast with the standard setscrew retention method of the CP35 Cage Plate, each CP06F arm clamps onto cage rods using a separate flexure clamp that increases holding force and cage plate rigidity.

This cage plate is 0.35" (8.9 mm) thick and provides a center-located Ø1" double bore for mounting a Ø1" optic at least 0.125" (3.2 mm) thick. The optic is retained by a nylon-tipped setscrew with a 5/64" (2.0 mm) hex. The cap screw on each flexure cage rod through hole can be tightened using a 5/64" (2.0 mm) hex key or Thorlabs' HKTS-5/64 Hex Key Thumbscrews.

The CP06F(/M) cage plate can be post-mounted via the 8-32 (M4) tapped hole on the bottom. We also offer the CP02F(/M) Cage Plate with Internal SM1 Threads.

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CP06F Support Documentation
CP06F30 mm Flexure Cage Plate with Ø1" Double Bore, 8-32 Tap
$26.64
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CP06F/M Support Documentation
CP06F/M30 mm Flexure Cage Plate with Ø1" Double Bore, M4 Tap
$26.64
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30 mm Cage Plate for Male D4T Dovetails

Cage-Mounted PMT1002
Click to Enlarge

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Item #QtyDescription
PMT10021Multialkali Amplified PMT, 230 - 920 nm, C-Mount Threads
DTC051Male D4T Dovetail Adapter, External C-Mount Threads, Internal SM05 Threads
DTCP1130 mm Cage Plate, Female D4T Dovetail, 8-32 Mounting Hole
RS3P8E1Ø1" Pedestal Pillar Post, 8-32 Taps, L = 3"
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
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Item #QtyDescription
PMT10021Multialkali Amplified PMT, 230 - 920 nm, C-Mount Threads
DTC051Male D4T Dovetail Adapter, External C-Mount Threads, Internal SM05 Threads
DTCP1/M130 mm Cage Plate, Female D4T Dovetail, M4 x 0.7 Mounting Hole
RS3P4M1Ø25.0 mm Pedestal Pillar Post, M4 Taps, L = 75 mm
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
DTCP1(/M) Cage Plate Used to Mount a PMT in a 30 mm Cage System
  • Central Bore Accepts Male D4T Dovetails
  • Cone-Tip Brass Setscrew to Secure Dovetail in Cage Plate
  • Four Ø6 mm Through Holes for ER Cage Rods
  • 8-32 (M4 x 0.7) Threaded Hole for Post Mounting

The DTCP1(/M) 30 mm Cage Plate has a Ø1.20" (30.5 mm) central bore that accepts male D4T dovetails, such as our C-Mount and SM1-Threaded Dovetail Adapters. A side-located 5/64" (2 mm) brass setscrew with a cone tip is used to lock the dovetail in place. A dovetail mounted in this cage plate can be rotated 360° to adjust the alignment of a mounted component. Additionally, the dovetail allows components to be quickly mounted without the need to rotate them, as would be case for a threaded connection, simplifying the assembly of a system that has cables attached.

Four Ø6 mm through holes for ER cage rods allow for integration into a 30 mm cage system. The plate can be slid along the cage rods to the desired position and locked in place using four side-located, 5/64" (2.0 mm) hex setscrews. An 8-32 (M4 x 0.7) threaded hole in the bottom of the cage plate can be used for post mounting.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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DTCP1 Support Documentation
DTCP130 mm Cage Plate, Female D4T Dovetail, 8-32 Mounting Hole
$40.60
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DTCP1/M Support Documentation
DTCP1/M30 mm Cage Plate, Female D4T Dovetail, M4 x 0.7 Mounting Hole
$40.60
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30 mm Cage Plate with Ø1.2" Bore


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Item #QtyDescription
Imperial Product List
PH31Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
TR1.51Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
CP36130 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
CP331SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
SM1L301SM1 Lens Tube, 3.00" Thread Depth, One Retaining Ring Included
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
View Metric Product List
Item #QtyDescription
Metric Product List
PH75/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm
TR40/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
CP36130 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
CP33/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
SM1L301SM1 Lens Tube, 3.00" Thread Depth, One Retaining Ring Included
ER4-P41Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
  • Ø1.2" Bore Supports Outside Diameter of SM1 Lens Tubes and C-Mount Extension Tubes
  • Compatible with 30 mm Cage Systems
  • Nylon-Tipped Setscrew and Double Bore Securely Hold Lens Tubes
  • Not Post Mountable

The CP36 cage plate is designed to allow our SM1 Lens Tubes or C-Mount Extension Tubes to slide into the cage plate and be locked in position with a nylon-tipped 8-32 setscrew. This is ideal for situations where it is not desirable to thread the lens tube into one of our threaded cage plates. It will also allow our Ø1.2" free-space isolator packages to be integrated into a 30 mm cage system. A double-bore design gives three points of contact for stable and secure mounting. Each cage rod through hole is accompanied by a side-located locking M4 setscrew, which can be secured using a 5/64" (2 mm) hex key or balldriver.

Please note that this cage plate does not feature a tapped mounting hole, unlike many of our other cage plates. Due to the bore size, there would be interference between the threaded stud on our Ø1/2" posts and the clear aperture of the bore. Therefore, this cage plate cannot be used directly with Ø1/2" Posts, and a cage system utilizing this plate must be supported using a different method. For a post-mountable solution, consider our SM1RC or SM1TC lens tube clamps, but note that these parts are not cage compatible.

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CP36 Support Documentation
CP3630 mm Cage Plate, Ø1.2" Double Bore for SM1 and C-Mount Lens Tubes
$24.23
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30 mm Cage Plate with 35 mm Clear Aperture

  • 35 mm Bore Supports Outer Diameter of SM30 Lens Tubes and Ø1.38" Free-Space Isolators
  • Designed with the Largest Possible Clear Aperture (Ø35 mm)
  • Compatible with 30 mm Cage Systems
  • Nylon-Tipped Setscrew and Double Bore Securely Hold Lens Tubes
  • Post Mountable with an 8-32 (M4) Tapped Hole

The CP37(/M) cage plate is designed to allow our SM30 Lens Tubes or Ø1.38" Free-Space Isolators to be mounted in our 30 mm cage system. A lens tube or isolator is held in place against an inner double bore by fastening an 8-32 nylon tipped setscrew with a 5/64" (2.0 mm) hex wrench. This cage plate offers the largest clear aperture (Ø35 mm) possible within a 30 mm cage system assembly and is also suited for supporting long cage assemblies, providing a greater degree of structural rigidity without interfering with the optical path.

The Ø35 mm hole is large enough to allow an SM1-series lens tube to pass through completely unobstructed. Each cage rod through hole is accompanied by a side-located locking setscrew; these screws have a 5/64" (2.0 mm) hex head and M4 x 0.7 threading. 

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CP37 Support Documentation
CP37Ø35 mm Aperture, 30 mm Cage Plate, 0.35" Thick, 8-32 Tap
$22.95
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CP37/M Support Documentation
CP37/MØ35 mm Aperture, 30 mm Cage Plate, 0.35" Thick, M4 Tap
$22.95
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Ø2" Round Cage Plates (30 mm Cage and SM1 Compatible)


Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
CP38T1SM2-Threaded Round Cage Plate with SM1 Internal Thread and SM2 External Thread, 1 SM1RR Retaining Ring
KS2T1SM2-Threaded Precision Kinematic Mirror Mount for Ø2" Optics, 3 Adjusters
CXY1A130 mm Cage System, XY Translating Lens Mount for Ø1" Optics
LA7542-E31Ø1" ZnSe Plano-Convex Lens, f = 25.4 mm, AR-Coated: 7-12 µm
RS2P8E1Ø1" Pedestal Pillar Post, 8-32 Taps, L = 2"
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
View Metric Product List
Item #QtyDescription
Metric Product List
CP38T1SM2-Threaded Round Cage Plate with SM1 Internal Thread and SM2 External Thread, 1 SM1RR Retaining Ring
KS2T1SM2-Threaded Precision Kinematic Mirror Mount for Ø2" Optics, 3 Adjusters
CXY1A130 mm Cage System, XY Translating Lens Mount for Ø1" Optics
LA7542-E31Ø1" ZnSe Plano-Convex Lens, f = 25.4 mm, AR-Coated: 7-12 µm
RS2P4M1Ø25.0 mm Pedestal Pillar Post, M4 Taps, L = 50 mm
ER2-P41Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
CP38T Cage Plate Used to Mount a CXY1A XY Translating Lens Mount and Create a 4-Axis Alignment System
  • Compatible with 30 mm Cage Systems
  • CP38: SM1 (1.035"-40) Internal Threading and Smooth Ø2" Outer Diameter
  • CP38T: SM1 (1.035"-40) Internal Threading and SM2 (2.035"-40) External Threads
  • Ideal for Mounting Cage Assemblies in Optomechanical Mounts Designed for Ø2" Optics
  • Not Post Mountable

The CP38 and CP38T are ideal for mounting small cage subassemblies into optomechanical mounts designed for Ø2" optics (such as our KS2 Ø2" kinematic mirror mount) or SM2 threads (such as our SM2-threaded lens tubes). Both plates feature an SM1-threaded (1.035"-40) hole for mounting Ø1" optics up to 0.2" (5 mm) thick. Cage rods can be secured in each cage rod through hole by a side-located 5/64" (2.0 mm) hex setscrew. One SM1RR retaining ring is included. Please note that in order to mount a Ø1" optic in the SM1-threaded hole, two SM1RR retaining rings will be needed.

The CP38 has a smooth Ø2" outer diameter, which works well with Ø2" mounts with a setscrew, while the CP38T has SM2 (2.035"-40) external threads.

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CP38 Support Documentation
CP38Ø2" Outer Diameter Round Cage Plate with SM1 Internal Thread, 1 SM1RR Retaining Ring
$34.17
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CP38T Support Documentation
CP38TSM2-Threaded Round Cage Plate with SM1 Internal Thread and SM2 External Thread, 1 SM1RR Retaining Ring
$35.35
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30 mm Cage Plates for Premounted Aspheric and Achromatic Lenses

  • Internal Threads Compatible with our Premounted Aspheric and Achromatic Lenses
  • 0.35" (8.9 mm) Thick Cage Plate
  • 8-32 (M4) Tap for Post Mounting
  • Compatible with 30 mm Cage Systems

These cage plates are ideal for mounting aspheric or small achromatic lenses in a 30 mm cage system without the use of adapters. They are available with M6, M8, M9, M10, or M12 internal threads. The cage plates with M12 internal threads are ideal for mounting our singlet and triplet fiber collimators with external M12 x 0.5 threading. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured to a cage rod using a 5/64" (2.0 mm) hex key.

Alternatively, aspheric lenses can be mounted within a cage system using our aspheric lens adapters and a standard SM1-threaded cage plate.

Item # Internal
Threads
 Base Item # of Compatible Mounted Lenses Mount
Thickness
CP1M06(/M) M6 x 0.5 A414TM, C140TME, C151TMD, C392TME, C430TME, C710TME Aspheric Lenses 0.35" (8.9 mm)
CP1M08(/M) M8 x 0.5 C021TME, C170TME, C350TMD, C390TME, C440TME, C660TME Aspheric Lenses
CP1M09(/M) M9 x 0.5 A110TM, A220TM, A230TM, A375TM, A390TM, A397TM, C036TME, C037TME, C110TME, C220TME, C230TME,
C260TMD, C280TME, C330TMD, C340TMD, C560TME, C610TME, C775TMD Aspheric Lenses;
Ø5 mm, Ø6 mm, and Ø6.35 mm Mounted Achromatic Doublets
CP1M10(/M) M10 x 0.5 C028TME Aspheric Lenses
CP1M12(/M) M12 x 0.5 A240TM, C240TME Aspheric Lenses; Ø8 mm Mounted Achromatic Doublets
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CP1M06 Support Documentation
CP1M0630 mm Cage Plate with M6 x 0.5 Internal Threads, 8-32 Tap
$42.88
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CP1M08 Support Documentation
CP1M0830 mm Cage Plate with M8 x 0.5 Internal Threads, 8-32 Tap
$42.88
Today
CP1M09 Support Documentation
CP1M0930 mm Cage Plate with M9 x 0.5 Internal Threads, 8-32 Tap
$42.88
Today
CP1M10 Support Documentation
CP1M1030 mm Cage Plate with M10 x 0.5 Internal Threads, 8-32 Tap
$42.88
Today
CP1M12 Support Documentation
CP1M1230 mm Cage Plate with M12 x 0.5 Internal Threads, 8-32 Tap
$42.88
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CP1M06/M Support Documentation
CP1M06/M30 mm Cage Plate with M6 x 0.5 Internal Threads, M4 Tap
$42.88
Today
CP1M08/M Support Documentation
CP1M08/M30 mm Cage Plate with M8 x 0.5 Internal Threads, M4 Tap
$42.88
Today
CP1M09/M Support Documentation
CP1M09/M30 mm Cage Plate with M9 x 0.5 Internal Threads, M4 Tap
$42.88
Today
CP1M10/M Support Documentation
CP1M10/M30 mm Cage Plate with M10 x 0.5 Internal Threads, M4 Tap
$42.88
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CP1M12/M Support Documentation
CP1M12/M30 mm Cage Plate with M12 x 0.5 Internal Threads, M4 Tap
$42.88
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30 mm Cage Plates for Unmounted Optics from Ø5 mm to Ø20 mm

Turning Cage Cube
Click to Enlarge

CPN08 Used to Mount an AC080-020-A Unmounted Ø8 mm Achromatic Doublet in a 30 mm Cage System with a KCB1 Mount
  • Mount Ø5 mm to Ø20 mm Optics
  • Two Retaining Rings Included for Mounting Optic
  • Compatible with 30 mm Cage Systems
  • Ideal for Use with Unmounted Aspheric and Achromatic Lenses
  • Not Post Mountable

These cage plates are designed for mounting optics that have diameters up to 20 mm, such as our unmounted aspheric and achromatic lenses, into a 30 mm cage system. They have M5.5, M6.5, M8.5, M9.5, M15.5, 0.750"-40, or M20.5 internal threads and include two retaining rings of the appropriate size to secure the optic. The SPW801 spanner wrench is recommended when threading the retaining rings into place. Each cage rod through hole is accompanied by a side-located locking setscrew, which can be secured to a cage rod using a 5/64" (2.0 mm) hex key.

Thorlabs also offers internally threaded, post-mountable fixed mounts, which are not cage compatible, for mounting optics from Ø5 mm to Ø4".

Item # Optic
Diameter
CAa Optic Thickness (Max)b Internal Threads Retaining Ring Mount Thickness Spanner Wrench
CPN05 5 mm Ø0.15" (Ø3.8 mm) 0.09" (2.2 mm) M5.5 x 0.5 SM5RR 0.23" (5.7 mm) SPW205 or SPW801
CPN06 6 mm Ø0.19" (Ø4.8 mm) 0.11" (2.8 mm) M6.5 x 0.5 SM6RR 0.25" (6.4 mm) SPW206 or SPW801
CPN08 8 mm Ø0.27" (Ø6.9 mm) 0.16" (4.0 mm) M8.5 x 0.5 SM8RR 0.30" (7.6 mm) SPW208 or SPW801
CPN09 9 mm Ø0.31" (Ø7.9 mm) 0.16" (4.0 mm) M9.5 x 0.5 SM9RR 0.30" (7.6 mm) SPW209 or SPW801
CPN15 15 mm Ø0.50" (Ø12.7 mm) 0.21" (5.3 mm) M15.5 x 0.5 SM15RR 0.35" (8.9 mm) SPW801
CPN18 18 mm Ø0.62" (Ø15.7 mm) 0.24" (6.1 mm) 0.750"-40 SM18RR 0.40" (10.2 mm) SPW801
CPN20 20 mm Ø0.68" (Ø17.3 mm) 0.24" (6.1 mm) M20.5 x 0.5 SM20RR 0.40" (10.2 mm) SPW801
  • Clear Aperture of Retaining Ring
  • Maximum Optical Thickness: This specification is true for thin lenses. For lenses with small focal lengths, and hence large lens curvatures, please contact Tech Support to ensure a proper fit.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CPN05 Support Documentation
CPN0530 mm Cage Plate for Ø5 mm Optic, 2 SM5RR Retaining Rings Included
$33.60
Today
CPN06 Support Documentation
CPN0630 mm Cage Plate for Ø6 mm Optic, 2 SM6RR Retaining Rings Included
$33.60
Today
CPN08 Support Documentation
CPN0830 mm Cage Plate for Ø8 mm Optic, 2 SM8RR Retaining Rings Included
$33.60
Today
CPN09 Support Documentation
CPN0930 mm Cage Plate for Ø9 mm Optic, 2 SM9RR Retaining Rings Included
$33.60
7-10 Days
CPN15 Support Documentation
CPN1530 mm Cage Plate for Ø15 mm Optic, 2 SM15RR Retaining Rings Included
$34.95
7-10 Days
CPN18 Support Documentation
CPN1830 mm Cage Plate for Ø18 mm Optic, 2 SM18RR Retaining Rings Included
$34.95
Today
CPN20 Support Documentation
CPN2030 mm Cage Plate for Ø20 mm Optic, 2 SM20RR Retaining Rings Included
$37.27
Today
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Blank Cage Plate

  • Ideal for Custom Machining to Mount Non-Standard Components
  • Designed for 30 mm Cage System
  • Post-Mountable via 8-32 (M4 x 0.7) Tapped Hole
  • Black-Anodized Aluminum

Blank cage plates are ideal when standard threads and hole sizes are insufficient for custom mounting and OEM-level requirements. Custom hole sizes and threads can be machined using drill bits and taps; one surface of the cage plate has a small dimple in the center to aid in alignment when machining a bore. One side of the cage plate has an 8-32 (M4 x 0.7) tapped hole for post mounting. Each cage rod through hole is accompanied by a side-located M4 locking setscrew, which can be secured using a 5/64" (2.0 mm) hex key.

Thorlabs also offers the SP01 16 mm and LCP31(/M) 60 mm blank cage plates.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CP31 Support Documentation
CP31Blank 30 mm Cage Plate, 0.35" Thick, 8-32 Tap
$18.89
Today
+1 Qty Docs Part Number - Metric Price Available
CP31/M Support Documentation
CP31/MBlank 30 mm Cage Plate, 8.9 mm Thick, M4 x 0.7 Tap
$18.89
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Optical Cage Plate Gasket

  • Highly Compressible Material Blocks Light Between Mating Optical Mounts
  • Perfect for use with Light-Sensitive Instrumentation
  • Typically used in a 30 mm Cage Assembly

This optical gasket is used to create a light-tight interface between two mating optical mounts. The highly compressible foam, measuring 0.25" (6 mm) thick in an uncompressed state, can easily adapt to uneven surfaces to maintain a light-tight seal between mating parts.

Most commonly used in cage assemblies, these gaskets are perfect for highly sensitive instrumentation such as CCD cameras and amplified photodiodes where ambient lighting is sufficient to saturate detection equipment or degrade signal-to-noise ratios.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CPG3 Support Documentation
CPG330 mm Cage Plate Gasket
$7.54
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Cage Plate Stops for ER Rods


Click to Enlarge

ERCPS Cage Plate Stops snap onto cage rods without any disassembly of the cage system.

Click to Enlarge

ERCPS Cage Rod Stops can mark the position of cage components.
  • Marks the Position of Cage Components
  • Flexure Clamping Mechanism
  • Sold in Packs of Four

ERCPS Cage Plate Stops mark the position of a cage plate, allowing it to be reliably moved and repositioned in a cage system. These clamps are 0.14" (3.6 mm) thick and are compatible with our Ø6 mm cage rods for 30 mm and 60 mm cage systems. Utilizing a flexure design, the clamps are secured in place using a 0.05" (1.3 mm) hex key. They can be easily clamped onto the middle of a cage rod without removing other components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
ERCPS Support Documentation
ERCPSCustomer Inspired! Cage Plate Stops for ER Rods, 4 Pack
$49.01
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Alignment Plates for 30 mm Cage Systems


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Front View of VRC1CPT Drop-In Alignment Plate
  • Drop-In Beam Alignment Tools
  • Small Through Hole Aligned at Center of 30 mm Cage Assembly

The CPA1 and CPA2 Alignment Plates are convenient tools for aligning cage-based optical systems. These drop-in plates feature a small through hole at the exact center of the 30 mm cage assembly that is used for aligning visible beams. For easy alignment, the through hole is surrounded by engraved rings, which indicate Ø4 mm, Ø7 mm, Ø10 mm, and Ø13 mm. The CPA1 provides a Ø0.9 mm through hole, while the CPA2 provides a Ø5 mm through hole.

The VRC1CPT, VRC2CPT, VRC4CPT, and VRC6SCPT Alignment Plates are specifically designed to align UV to MIR beams in a cage-based optical assembly. These plates have concentric alignment ring engravings identical to the CPA1 (shown to the left) plate on the back. The fronts of the VRC1CPT, VRC2CPT, and VRC4CPT plates each include a Ø1/2" (Ø12.7 mm), non-rotating fluorescing alignment disk made of the same material used in our VRC1, VRC2, and VRC4 Viewing Cards, respectively. Alternatively, the front of the VRC6SCPT plate includes a Ø0.39" (Ø10.0 mm), non-rotating MIR alignment disk made of the same thermochromic liquid crystal material used in our VRC6S Viewing Card. The disk on the VRC1CPT, VRC2CPT, or VRC4CPT plate has a Ø1.5 mm hole centered on the plate's Ø0.9 mm hole, and the disk on the VRC6SCPT plate has a Ø2.0 mm hole centered on the plate's Ø0.9 mm hole. 

Item # Absorption Band Emission Band Sensitivity Graph Minimum Detectable Power Density Active Region Diameter Alignment Features
VRC1CPT 250 - 540 nm 450 to 750 nm VRC1 Absorption and Emission Bands N/A 1/2" (12.7 mm) Ø0.9 mm Hole in Plate
Ø1.5 mm Hole in Disk Center
VRC2CPT 400 - 640 nm,
800 - 1700 nm
~580 to 750 nm VRC2 Absorption and Emission Bands
VRC4CPT 790 - 840 nm,
870 - 1070 nm,
1500 - 1590 nm
~520 to 580 nm VRC4 Absorption and Emission Bands
VRC6SCPT 1.5 to >13.2 µm N/A N/A 0.05 mW/mm2 @ 1550 nm (22 °C)  0.39" (10.0 mm) Ø0.9 mm Hole in Plate
Ø2.0 mm Hole in Disk Center
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
CPA1 Support Documentation
CPA130 mm Cage Alignment Plate with Ø0.9 mm Hole
$14.84
Today
CPA2 Support Documentation
CPA230 mm Cage Alignment Plate with Ø5 mm Hole
$14.84
Today
VRC1CPT Support Documentation
VRC1CPT30 mm Cage System Alignment Plate with UV and Visible Disk (250 - 540 nm)
$35.94
Today
VRC2CPT Support Documentation
VRC2CPT30 mm Cage System Alignment Plate with Visible and IR Disk (400 - 640 nm, 800 - 1700 nm)
$35.94
Today
VRC4CPT Support Documentation
VRC4CPT30 mm Cage System Alignment Plate with IR Disk (790 - 840 nm, 870 - 1070 nm, 1500 - 1590 nm)
$35.94
Today
VRC6SCPT Support Documentation
VRC6SCPT30 mm Cage System Alignment Plate with MIR Disk, 1.5 to >13.2 µm
$41.92
Today