End Caps and Plugs


  • End Caps with SM05, SM1, SM2, SM3, RMS, M25 x 0.75, or C-Mount Threading
  • Plugs with SM05, SM1, or SM2 Threading
  • Snap-On Plastic End Caps for C-Mount, SM1-, or SM2-Threaded Lens Tubes
  • Cover for D1N Dovetails

SM1CP2M

Externally SM1-Threaded
End Cap

SM1EC2B

Snap-On Cap for
Ø1" Lens Tubes

CMCP1

Internally C-Mount-Threaded End Cap

SM2PL

Externally
SM2-Threaded Plug

SM05CP2

Externally SM05-Threaded End Cap

RMSCP1

Internally RMS-Threaded
End Cap

D1NEC2

D1N Dovetail Cover

SM05EC2

Soft Dust Cap for SM05 Lens Tubes

Related Items


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Lens Tube Cap, End Cap
Click to Enlarge

SM1EC2B Lens Tube Cap Seals Off the End of a Ø1" Lens Tube

Thorlabs offers a selection of anodized aluminum SM-threaded end caps and plugs for use with Ø1/2", Ø1", Ø2", and Ø3" lens tubes. Additionally, there are anodized aluminum caps for use with RMS, M25 x 0.75, and C-mount-threaded components available. We also offer plastic snap-on caps for C-mount, Ø1", and Ø2" lens tubes, as well as a plastic cover for D1N dovetails.

The end caps are useful for sealing off the end of imaging components for protecting the optics during transport or storage. The plugs can be threaded deep into a lens tube to produce a seal closer to the optic and feature two dimples that accept our spanner wrenches. The D1N cover protects against unwanted light and dust. Additionally, a selection of these caps and plugs are marked at their center with a dimple to facilitate custom-sized bores centered on the optical axis of the lens tube, making them useful for machining custom inserts.

Selection Guide
SM05
Threaded
RMS
Threaded
M25 x 0.75
Threaded
C-Mount
Threaded
C-Mount
Snap-On
SM1
Threaded
Ø1"
Snap-On
SM2
Threaded
Ø2"
Snap-On
D1N 
Dovetail
SM3
Threaded

Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location Loose Optimal Strict
Internal 1B 2B 3B
External 1A 2A 3A
Metric Thread Tolerance Positions
Location Loose Optimal Strict
Internal - G H
External e or f g h
Metric Thread Tolerance Grades
Dimension Location Tolerance Gradesa
Minor Diameter Internal 4, 5, 6, 7, 8
Major Diameter External 4, 6, 8
Pitch Diameter Internal 4, 5, 6, 7, 8
External 3, 4, 5, 6, 7, 8, 9
  • The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0 UNS-2A Internal Thread, 0.535"-40.0 UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of Thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of Thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0 UNS-2A Internal Thread, 0.800"-36.0 UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of Thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of Thread) 0.777"
C-Mount Threading: Machine Vision Lenses, CCD/CMOS Cameras
External Thread, 1.000"-32.0 UN-2A Internal Thread, 1.000"-32.0 UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of Thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of Thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0 UNS-2A Internal Thread, 1.035"-40.0 UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of Thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of Thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5 x 0.5 – 6H/6g Internal Thread, M30.5 x 0.5 – 6H/6g
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of Thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of Thread) 30.094 mm
SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40 UNS-2A Internal Thread, 1.535"-40 UNS-2B
Max Major Diameter 1.5339" Min Major Diameter 1.535"
Min Major Diameter 1.5288" Min Pitch Diameter 1.5188"
Max Pitch Diameter 1.5177" Max Pitch Diameter 1.5236"
Min Pitch Diameter 1.5140" Min Minor Diameter (and 83.3% of Thread) 1.508"
Max Minor Diameter 1.5068" Max Minor Diameter (and 64.9% of Thread) 1.514"
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0 UNS-2A Internal Thread, 2.035"-40.0 UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of Thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of Thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0 UNS-2A Internal Thread, 3.035"-40.0 UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of Thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of Thread) 3.014"
SM4 Threading: Ø4" Lens Tubes
External Thread, 4.035"-40 UNS-2A Internal Thread, 4.035"-40.0 UNS-2B
Max Major Diameter 4.0337" Min Major Diameter 4.0350"
Min Major Diameter 4.0286" Min Pitch Diameter 4.0188"
Max Pitch Diameter 4.0175" Max Pitch Diameter 4.0245"
Min Pitch Diameter 4.0131" Min Minor Diameter (and 83.3% of Thread) 4.008"
Max Minor Diameter 4.0066" Max Minor Diameter (and 64.9% of Thread) 4.014"

Posted Comments:
Nathan Bramall  (posted 2022-08-03 11:54:47.92)
Hi, The solid models for SM05PL (both SolidWorks and STEP) were exported using only surfaces. This makes it impossible for SolidWorks to work with-- can't modify this part to incorporate into optical designs. I don't remember this being the case in the past... Best, Nathan
cdolbashian  (posted 2022-08-16 09:41:16.0)
Thank you for finding this Nathan! We have updated the part so that it is a solid body, rather than an assembly of surfaces.
Paul Carpenter  (posted 2022-07-26 14:10:25.01)
The SM05PL (Externally SM05 Threaded Plugs) that arrived do not have spanner wrench holes on both sides as shown in the drawing and solid model. The spanner wrench holes are only on the side with the drill point center mark & company/part # markings.
jdelia  (posted 2022-07-29 02:17:33.0)
Thank you for contacting Thorlabs. The parts are only meant to come with the holes on one side. We are currently looking into updating the website to better reflect this. In the meantime, I have reached out to you regarding options on how to proceed with the parts you currently have.
Andrey Kuznetsov  (posted 2019-07-13 16:39:39.45)
SM1CP1 PDF states the thread is 4.0mm deep, based on other dimensions and solidworks file, the thread depth is 2.0mm and cavity depth is 3.6mm. Please update the PDF.
llamb  (posted 2019-07-16 01:38:23.0)
Thank you for bringing this to our attention. We will correct the PDF drawing.
akuznetsov  (posted 2018-10-25 23:07:47.41)
For 2" end caps, there is an LCP01 cage plate that you can mount the end cap into and then place the cage mount into a vise on a mill and make holes in the end cap without damaging the threads, etc. But I cannot find a suitable equivalent to do the same thing with the 3" lens cap. If I try to hold the lens cap by the sides, I will damage the threads. I could try using double stick tape to hold the part down but I'm afraid that the milling force might be too big and rip the part off the tape.
llamb  (posted 2018-10-26 09:28:54.0)
Thank you for your feedback. While we do not have a larger cage plate with SM3 thread to ideally mimic your setup, you may consider using another SM3-threaded product to work with, such as our SM3A95 adapter (which has 60 mm cage compatibility) or our LMR3 lens mount.
cbrideau  (posted 2017-10-30 16:41:41.333)
I found these useful for capping ports on equipment that had to be shipped. They were easy to put on and take off and stayed secure in transit.
tfrisch  (posted 2017-11-15 01:26:52.0)
Hello, thank you for the feedback. I'm glad these were able to protect your optical surfaces in transit!
gdovillaire  (posted 2016-08-31 14:11:25.697)
Hi, Do you manufacture these caps without any mark on the front ? Thanks, Guillaume
bjorn.lenormand  (posted 2015-12-03 13:50:46.967)
A step file for the SM1PL is missing, could you please provide this as well?
besembeson  (posted 2015-12-03 10:37:45.0)
Response from Bweh at Thorlabs USA: Thanks for bringing this to our attention. I will share this with you and we will add to the web.
cdaly  (posted 2012-11-30 22:19:47.32)
Response from Chris at Thorlabs: Thank you for using our feedback feature. These lens tube caps/plugs are all made from black anodized aluminum.
farrell  (posted 2012-11-29 10:56:24.843)
Are these end caps machined from metal or are they made of plastic?
Thorlabs  (posted 2010-09-14 15:35:26.0)
Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. I will bring this to the attention of our design engineers and we will possibly add it to our list of upcoming products.
user  (posted 2010-09-14 13:52:14.0)
I would like to see plastic end cap covers that would slip over the 1" lens tubes to protect optics from dust when not in use.
klee  (posted 2009-11-13 18:19:52.0)
A response from Ken at Thorlabs to d.sproles: We did have some internal discussions about this but there is no definite plan to bring a SM05 plug to the market yet. In the meantime, we can make this as a special. If you are interested, please let us know the quantity and we can send you a quotation.
d.sproles  (posted 2009-11-13 12:57:42.0)
Still no SM05 plug? :(
ghegenbart  (posted 2008-11-28 08:56:06.0)
Response from Gerald (Tech Support Thorlabs GmbH Germany) to M. Zimmermann: Thank you very much for your product idea. We already got several requests about a SM05 plug similar to the SM1PL and are planning on adding this product to our offering.
m.zimmmermann  (posted 2008-11-28 06:07:02.0)
SM1PL - SM1 Plug: It would be useful to have such a plug for SM 0.5. Best regards.
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Ø1/2" Lens Tube End Caps and Plugs

  • SM05CP1: Internally SM05-Threaded End Cap
  • SM05CP2: Externally SM05-Threaded End Cap
  • SM05PL: Externally SM05-Threaded Plug
  • SM05A7: Externally SM05-Threaded Alignment Target

The SM05CP1 and SM05CP2 are black-anodized aluminum end caps used to seal off a Ø1/2" lens tube. The SM05CP1 has internal SM05 (0.535"-40) threads to seal the end of an externally SM05-threaded lens tube, while the SM05CP2 has external SM05 threads to seal the end of an internally SM05-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened.

The SM05PL lens tube plug has external SM05 (0.535"-40) threads along its entire length and is designed to seal off our Ø1/2" lens tubes. It can be threaded into an SM05 lens tube using an SPW801 spanner wrench that can be adjusted so that the tips of the prongs on the SPW801 fit into the two shallow holes, each of which is located 0.20" from the center dimple. The center dimple of the SM05PL allows it to be customized in a machine shop with excellent centration.

The SM05A7 alignment disk provides useful aids for aligning visible beams to the center of optical mounts. To enable accurate alignment, the disk has clear markings with graduations on both the X and Y axes. The back of the alignment disk features our standard SM05 (0.535"-40) threading for compatibility with Ø1/2" lens tubes and fixed optic mounts.
 
 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM05CP1 Support Documentation
SM05CP1Internally SM05-Threaded End Cap
$16.99
Today
SM05CP2 Support Documentation
SM05CP2Externally SM05-Threaded End Cap
$16.99
Today
SM05PL Support Documentation
SM05PLExternally SM05-Threaded Plug
$14.62
Today
SM05A7 Support Documentation
SM05A7SM05 Series Alignment Disk
$20.86
Today
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Ø1/2" Lens Tube Soft Dust Cap

Lens Tube Cap, End Cap
Click to Enlarge
Back View of the SM05EC2 Soft Dust Cap
  • SM05EC2: Externally SM05-Threaded Plastic Soft Dust Caps for Ø1/2" Lens Tubes
  • Ideal for Temporary Protection of Components
  • Sold in Packs of Five

    The SM05EC2 Soft Dust Cap has external SM05 (0.535"-40) threads and can be used to seal off our Ø1/2" lens tubes. This cap helps to protect optics against dust and debris while not in active use. The SM05EC2 cap is 24.6 mm (0.97") across its widest point where two fins extend from the Ø17.8 mm (Ø0.70") central part of the cap.

    To remove the cap, either unscrew it or pinch the cap via the fins on either side and pull off the tube. If the cap is on a flat surface without room to pinch the side fins, pull on the longer fin to remove the cap. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    SM05EC2 Support Documentation
    SM05EC2Soft Dust Cap for SM05 Lens Tubes, 5 Pack
    $9.18
    Today
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    RMS Caps

    Objective Lens Turret Protected by RMSCP2 Dust Cap
    Click to Enlarge

    RMSCP2 Protecting Turret Ports
    Microscope Objective Covered by RMSCP1 Dust Cap
    Click to Enlarge

    RMSCP1 Covering an Objective
    • RMSCP1: Internally RMS-Threaded Cap
    • RMSCP2: Externally RMS-Threaded Cap

    These RMS-Threaded Caps are designed to protect microscope objectives lenses, objective lens ports, and other RMS (0.800"-36) threaded components. The RMSCP1 features internal RMS threading, which enables them to be used with standard RMS-threaded microscope objectives. The RMSCP2 features external RMS threading to cover unused objective lens ports (see image on the far right). Each of these caps is made from anodized aluminum and has a knurled edge for secure hand tightening.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    RMSCP1 Support Documentation
    RMSCP1Internally RMS-Threaded Cap for Microscope Objective Lenses
    $18.89
    Today
    RMSCP2 Support Documentation
    RMSCP2Externally RMS-Threaded Cap for Objective Lens Ports
    $18.89
    Today
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    M25 x 0.75 Caps

    Lens Tube Cap, End Cap
    Click to Enlarge

    Each Cap is Engraved with
    Part Number and Alignment Marker
    • M25CP1: Internally M25 x 0.75-Threaded Cap
    • M25CP2: Externally M25 x 0.75-Threaded Cap

    These M25 x 0.75-Threaded Caps are designed to protect microscope objectives, objective lens ports, and other M25 x 0.75-threaded components. The M25CP1 cap features internal M25 x 0.75 threading, which enables it to be used with a standard M25 x 0.75-threaded microscope objective. The M25CP2 cap features external M25 x 0.75 threading to cover unused objective lens ports. Both M25CP1 and M25CP2 caps feature an alignment engraving to aid in the alignment of visible beams. Each of these caps is made from anodized aluminum and has a knurled edge for secure hand tightening.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    M25CP1 Support Documentation
    M25CP1Internally M25 x 0.75-Threaded Cap for Microscope Objective Lenses
    $21.42
    Today
    M25CP2 Support Documentation
    M25CP2Externally M25 x 0.75-Threaded Cap for Objective Lens Ports
    $21.42
    Today
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    C-Mount Caps

    Lens Tube Cap, End Cap
    Click to Enlarge

    Each Cap is Engraved with
    Part Number
    • CMCP1: Internally C-Mount-Threaded Cap
    • CMCP2: Externally C-Mount-Threaded Cap

    These C-Mount Caps are designed to be used with our CCD/CMOS camerasC-mount extension tubes, camera lenses, and other C-mount-threaded (1.00" -32) components. The CMCP1 features internal C-mount threading while the CMCP2 features external C-mount threading. Each of these caps is made from black-anodized aluminum and has a knurled edge for secure hand tightening.

    To use one of these caps with a C-mount-threaded CCD or CMOS camera, please choose the externally threaded CMCP2 cap.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    CMCP1 Support Documentation
    CMCP1Customer Inspired! Internally C-Mount-Threaded Cap
    $20.68
    Today
    CMCP2 Support Documentation
    CMCP2Customer Inspired! Externally C-Mount-Threaded Cap
    $20.68
    Today
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    C-Mount Snap-On Cap

    Lens Tube Cap, End Cap
    Click to Enlarge
    Back View of CMEC2 Snap-On End Cap
    • CMEC2: Plastic Snap-On Dust Caps for C-Mount Cameras and Accessories
    • Ideal for Temporary Protection of Components
    • Sold in Packs of Five

      The CMEC2 plastic dust cap snaps onto internally C-Mount-threaded (1.00"-32) components, such as our CCD/CMOS cameras and C-mount extension tubes. By sealing off the end of C-Mount camera accessory or lens tube, this cap helps to protect optics against dust and debris while not in active use. The CMEC2 cap has an outer diameter of 30.5 mm (1.2").

      The lens cap can be placed on an internally C-mount threaded component by squeezing the protruding edge of the cap, inserting the back of the cap into the threads, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results.

      Based on your currency / country selection, your order will ship from Newton, New Jersey  
      +1 Qty Docs Part Number - Universal Price Available
      CMEC2 Support Documentation
      CMEC2Snap-On Plastic Dust Cap for C-Mount Lens Tubes, 5 Pack
      $13.18
      Today
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      Ø1" Lens Tube End Caps and Plugs

      • SM1CP1: Internally SM1-Threaded End Cap
      • SM1CP2: Externally SM1-Threaded End Cap
      • SM1CP2M: Externally SM1-Threaded End Cap for Machining
      • SM1PL: Externally SM1-Threaded Plug
      • SM1A7: Externally SM1-Threaded Alignment Disk

      The SM1CP1 and SM1CP2 are black-anodized aluminum end caps used to seal off a Ø1" lens tube. The SM1CP1 has internal SM1 (1.035"-40) threads to seal the end of an externally SM1-threaded lens tube, while the SM1CP2 has external SM1 threads to seal the end of an internally SM1-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened. The SM1CP2 features engraved crosshairs on one side that can be used for quick coarse alignment. For applications that require more precise alignment, please see our full selection of alignment tools.

      The SM1CP2M is an end cap with external SM1 threading and a knurled lip, while the SM1PL is a plug (no lip) with external SM1 threading. The SM1PL plug can be threaded into an SM1 lens tube using an SPW801 or SPW909 spanner wrench, both of which will fit into the two shallow holes located 10 mm from the center. The SM1CP2M and SM1PL both have a center drilled dimple located on the optical axis to allow them to be customized in a machine shop with excellent centration.

      The SM1A7 alignment disk provides useful aids for aligning visible beams to the center of optical mounts. To enable accurate alignment, the disk has clear markings with graduations on both the X and Y axes. The back of the SM1A7 has SM1 (1.035"-40) threading for compatibility with Ø1" lens tubes and fixed optic mounts
       

      Based on your currency / country selection, your order will ship from Newton, New Jersey  
      +1 Qty Docs Part Number - Universal Price Available
      SM1CP1 Support Documentation
      SM1CP1Internally SM1-Threaded End Cap
      $20.68
      Today
      SM1CP2 Support Documentation
      SM1CP2Externally SM1-Threaded End Cap
      $20.68
      Today
      SM1CP2M Support Documentation
      SM1CP2MExternally SM1-Threaded End Cap for Machining
      $21.00
      Today
      SM1PL Support Documentation
      SM1PLExternally SM1-Threaded Plug
      $16.99
      Today
      SM1A7 Support Documentation
      SM1A7SM1 Series Alignment Disk
      $20.86
      Today
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      Ø1" Snap-On Lens Tube Dust Cap

      Lens Tube Cap, End Cap
      Click to Enlarge
      Back View of SM1EC2B Snap-On End Cap
      • SM1EC2B: Plastic Snap-On Dust Caps for Ø1" Lens Tubes
      • Ideal for Temporary Protection of Components
      • Sold in Packs of Five

        The SM1EC2B plastic dust cap snaps onto internally SM1-threaded (1.035"-40) components, such as 30 mm cage plates and cubes or the internally threaded end of a Ø1" lens tube (see photo in the Overview tab). By sealing off the end of a lens tube or cage cube, this cap helps to protect optics against dust and debris while not in active use. The SM1EC2B cap has an outer diameter of 1.20" (30.5 mm). It is not compatible with C-mount threads.

        The lens cap is placed on the lens tube by squeezing the protruding edge of the cap, inserting the back of the cap into the lens tube, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results.

        Based on your currency / country selection, your order will ship from Newton, New Jersey  
        +1 Qty Docs Part Number - Universal Price Available
        SM1EC2B Support Documentation
        SM1EC2BSnap-On Plastic Dust Cap for SM1 Lens Tubes, 5 Pack
        $11.89
        Today
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        Ø2" Lens Tube End Caps and Plugs

        • SM2CP1: Internally SM2-Threaded End Cap
        • SM2CP2: Externally SM2-Threaded End Cap
        • SM2PL: Externally SM2-Threaded Plug

        The SM2CP1 and SM2CP2 are black-anodized aluminum end caps that allow a Ø2" lens tube to be sealed off. The SM2CP1 has internal SM2 (2.035"-40) threads to seal the end of an externally SM2-threaded lens tube, while the SM2CP2 has external SM2 threads to seal the end of an internally SM2-threaded lens tube. Both caps have a knurled edge to allow them to be securely hand tightened.

        The SM2PL is a blank plug with external SM2 threading. It can be threaded into a lens tube using an SPW801 spanner wrench that can be adjusted so that the tips of the prongs on the SPW801 fit into the two shallow holes machined near the edge of the plug. The center of the SM2PL plug is dimpled to allow it to be customized in a machine shop with excellent centration.

        Based on your currency / country selection, your order will ship from Newton, New Jersey  
        +1 Qty Docs Part Number - Universal Price Available
        SM2CP1 Support Documentation
        SM2CP1Internally SM2-Threaded End Cap
        $21.86
        Today
        SM2CP2 Support Documentation
        SM2CP2Externally SM2-Threaded End Cap
        $21.86
        Today
        SM2PL Support Documentation
        SM2PLExternally SM2-Threaded Plug
        $18.18
        Today
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        Ø2" Snap-On Lens Tube Dust Cap

        Lens Tube Cap, End Cap
        Click to Enlarge
        Back View of SM2EC2 Snap-On End Cap
        • SM2EC2: Plastic Snap-On Dust Caps for Ø2" Lens Tubes
        • Ideal for Temporary Protection of Components
        • Sold in Packs of Five

          The SM2EC2 plastic dust cap snaps onto internally SM2-threaded (2.035"-40) components, such as 60 mm cage plates and cubes or the internally threaded end of a Ø2" lens tube. By sealing off the end of a lens tube or cage cube, this cap helps to protect optics against dust and debris while not in active use. The SM2EC2 cap has an outer diameter of 2.20" (55.8 mm).

          The lens cap is placed on the lens tube by squeezing the protruding edges of the cap, inserting the back of the cap into the lens tube, and then releasing the cap. To avoid deforming the cap, be sure to squeeze the protruding edge when removing it. Avoid using these caps in high heat environments as the cap can deform; use at temperatures between 0 °C to 40 °C for best results.

          Based on your currency / country selection, your order will ship from Newton, New Jersey  
          +1 Qty Docs Part Number - Universal Price Available
          SM2EC2 Support Documentation
          SM2EC2Snap-On Plastic Dust Cap for SM2 Lens Tubes, 5 Pack
          $23.30
          Today
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          D1N Dovetail Cover

          Lens Tube Cap, End Cap
          Click to Enlarge
          Back View of D1NEC2 D1N Dovetail Cover
          D1N Cover on Nikon Microscope
          Click to Enlarge
          The D1N Dovetail Cover on the CSD1002 Double Camera Port
          • D1NEC2: Plastic Cover for D1N Female Dovetails
          • Ideal for Blocking Light and Protecting Components from Dust
          • Features a Finger Grip for Easy Handling

            The D1NEC2 plastic cover is ideal for covering unused ports in order to prevent unwanted light and dust from damaging or disrupting an imaging system. It is compatible with any component that has a D1N female dovetail, such as our epi-illuminator modulesfour-channel confocal systems, and double camera ports. It can also be used to cover the trinocular port on a Nikon Eclipse Upright or Ti Microscope (click the links to view a diagram of each system with labeled ports). The cap has an outer diameter of 2.85" (72.4 mm), is made from ABS plastic, and features a finger grip on the top for easy handling.

            Based on your currency / country selection, your order will ship from Newton, New Jersey  
            +1 Qty Docs Part Number - Universal Price Available
            D1NEC2 Support Documentation
            D1NEC2D1N Dovetail Cover
            $33.78
            Today
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            Ø3" Lens Tube End Cap


            Click to Enlarge

            Each SM3 end cap is engraved with its part number and a centered crosshairs for alignment.
            • SM3CP1: Internally SM3-Threaded End Cap
            • SM3CP2: Externally SM3-Threaded End Cap

            The SM3CP1 and SM3CP2 are black-anodized aluminum end caps that allow SM3-threaded (3.035"-40) lens tubes to be sealed off. The SM3CP1 has internal SM3 (3.035"-40) threads to seal the end of an externally SM3-threaded lens tube, while the SM3CP2 has external SM3 threads to seal the end of an internally SM3-threaded lens tube.

            Both caps have a knurled edge which allows them to be securely hand tightened. Each cap also features engraved crosshairs on one side that can be used for quick coarse alignment, as shown in the image to the right. For applications that require more precise alignment, please see our full selection of alignment tools

            Based on your currency / country selection, your order will ship from Newton, New Jersey  
            +1 Qty Docs Part Number - Universal Price Available
            SM3CP1 Support Documentation
            SM3CP1Customer Inspired! Internally SM3-Threaded End Cap
            $35.35
            Today
            SM3CP2 Support Documentation
            SM3CP2Externally SM3-Threaded End Cap
            $35.35
            Today
            Last Edited: Aug 02, 2013 Author: Lori Stover