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Post-Mountable V-Clamps


  • V-Clamp Models Accommodate Wide Range of Mounting Applications
  • Solid One-Piece V-Clamp Body Provides Excellent Stability
  • Vertical Clamping Arm Provides Stable, 3-Point Contact

6-32 (M4)
Tapped
Holes
3 Places

PM4

(One Included
with Each Mount)

VC3

VC1

8-32 (M4)
Nylon-Tipped
Setscrew

PM3

(One Included
with Each Mount)

Application Idea

A PCM Clamp with PCMV
V-Groove Adapter Mounting
a GRIN Collimator

VH1

Related Items

Features

  • Clamp Clylindrical Objects Ranging from Ø0.02" (Ø0.5 mm) to Ø2.04" (Ø51.8 mm)
  • V-Clamp Lengths from 0.42" (10.7 mm) to 6.0" (152.4 mm)
  • Clamping Arm Provides Stable, 3-Point Contact with the V-Clamp
  • Ø1/2" Post Mountable

These post-mountable V-Clamps are available in five distinct models, each designed for different cylindrical mounting requirements. Each model offers a solid, one-piece V-clamp body accompanied by a clamping arm whose contact area is positioned directly in-line with the center of the 'V'.

While most commonly used to hold cylindrical objects such as GRIN Lenses (VH1 and PCM with PCMV), Fiber Collimation Packages (VC1 and PCM with PCMV), Laser Diode Modules (VC3 and PCM with PCMV), and HeNe Lasers (VC6), these mounts are excellent general-purpose mounts capable of holding even unusually shaped objects. The V-shaped body and vertical clamping arm offers a stable, three-point contact resulting in stable component mounting. The V-clamps can all be mounted to Ø1/2" posts.

Documents Tab to be Discontinued...
Please note that this tab will be removed at the end of 2015. The same information displayed here can be found by clicking on the red Docs Icon (Support Documentation icon) next to the item of interest in the pricing area below.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
PCM Support Documentation PCM:Post Clamp Mount for Ø1/2” (12.7 mm) Posts
PCM/M Support Documentation PCM/M:Post Clamp Mount for Ø1/2” (12.7 mm) Posts
PCMP Support Documentation PCMP:Flat Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
PCMP/M Support Documentation PCMP/M:Flat Base Adapter for PCM(/M) Mount, M6 Threaded Stud
PCMV Support Documentation PCMV:V-Groove Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
PCMV/M Support Documentation PCMV/M:V-Groove Base Adapter for PCM(/M) Mount, M6 Threaded Stud
PM3 Support Documentation PM3:Small Adjustable Clamping Arm, 6-32 Threaded Post
PM3/M Support Documentation PM3/M:Small Adjustable Clamping Arm, M4 Threaded Post
PM3SP Support Documentation PM3SP:Extension Post for PM3 Clamping Arm, 6-32 Threaded
PM3SP/M Support Documentation PM3SP/M:Extension Post for PM3/M Clamping Arm, M4 Threaded
PM4 Support Documentation PM4:Large Adjustable Clamping Arm, 6-32 Threaded Post
Part NumberProduct Description
PM4/M Support Documentation PM4/M:Large Adjustable Clamping Arm, M4 Threaded Post
PM4SP Support Documentation PM4SP:Extension Post for PM4 Clamping Arm, 6-32 Threaded
PM4SP/M Support Documentation PM4SP/M:Extension Post for PM4/M Clamping Arm, M4 Threaded
VC1 Support Documentation VC1:Small V-Clamp with PM3 Clamping Arm, 0.75" Long
VC1/M Support Documentation VC1/M:Small V-Clamp with PM3/M Clamping Arm, 0.75" Long, Metric
VC3 Support Documentation VC3:Large V-Clamp with PM4 Clamping Arm, 2.5" Long
VC3/M Support Documentation VC3/M:Large V-Clamp with PM4/M Clamping Arm, 2.5" Long, Metric
VC6 Support Documentation VC6:Large V-Clamp with PM4 Clamping Arm, 6" Long
VC6/M Support Documentation VC6/M:Large V-Clamp with PM4/M Clamping Arm, 6" Long, Metric
VH1 Support Documentation VH1:Miniature V-Clamp, 0.42" Long, 8-32 Tapped Hole
VH1/M Support Documentation VH1/M:Miniature V-Clamp, 0.42" Long, M4 Tapped Hole

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Posted Comments:
Poster:jlow
Posted Date:2015-08-25 03:06:14.0
Response from Jeremy at Thorlabs: We can sell the parts separately. To request a quote for this, please contact us at techsupport@thorlabs.com
Poster:purchasing
Posted Date:2015-07-13 14:03:55.407
DO YOU SELL SEPARATE - VEE BLOCK, PM4, OR ARM (HOLDS THE PM4)
Poster:myanakas
Posted Date:2014-10-01 08:29:06.0
Response from Mike at Thorlabs: Thank you for your feedback. The supporting documentation, which includes the auto cad drawing, has been updated to include the information that you were looking for. The maximum and minimum rod diameters have been included along with the maximum and minimum clamping heights. The height of the resulting optical axis for each configuration can be calculated by subtracting half of the rod diameter from the clamping height. I have contacted you directly to provide the new drawing pdf and dxf.
Poster:swaldman
Posted Date:2014-08-14 19:11:57.25
The Auto Cad drawing does not include the information required. The minimum and maximum clamping height does not show the height of the resulting optical axis, and there is no other information on the drawing either. Please update.
Poster:cdaly
Posted Date:2014-05-29 03:18:00.0
Response from Chris at Thorlabs: Thank you for your feedback. I'll see if we can have this implemented into the current design. In the meantime, if you have room in your setup, the larger VC6 does currently feature 1/4"-20 counter bore holes on a 1" spacing for this purpose.
Poster:mchen
Posted Date:2014-05-22 17:14:41.803
Can you make VC3 equipped with two 1/4"-20 (M6) counterbores, so that it can be directly mounted on a translation stage? Thanks, Mike
Poster:tor
Posted Date:2011-01-19 17:54:53.0
Response from Tor at Thorlabs to anonymous poster: Thank you for your feedback. We apologize for any inconvenience you’ve had while using the PM1. We are aware of the shortfalls of the current design and are releasing an improved design in the next week. We would love to give you the opportunity to try the new design; please contact us at techsupport@thorlabs.com if you would like us to send you some samples.
Poster:
Posted Date:2011-01-18 15:09:09.0
The brass screws break too easily in this design!

Miniature V-Clamp, 0.42" (10.7 mm) Long

Miniature V-Clamp,
Click to Enlarge
VH1 V-Clamp Holding a GRIN Lens
  • Clamps Cylindrical Objects Ranging from Ø1/32" (0.8 mm) to Ø3/8" (9.5 mm)
  • Compact Design Ideal for Small Optomechanical and OEM Assemblies
  • Post Mountable via #8-32 (M4) Tapped Hole

This miniature V-clamp is ideal for applications that require the positioning of short, small diameter cylindrical components, such as our GRIN Lenses, ranging from Ø1/32" (0.8 mm) to Ø3/8" (9.5 mm). The VH1 measures just 0.42" (10.7 mm) from front to back, a compact design that allows close access to both ends of a cylindrically shaped optic fastened within the mount. Cylindrical objects are clamped in place via a nylon-tipped setscrew, using a 5/64" (2.0 mm) hex key, housed in an adjustable height arm. One bottom-located 8-32 (M4) tapped hole makes this V-clamp directly compatible with our Ø1/2" posts.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
VH1 Support Documentation
VH1Miniature V-Clamp, 0.42" Long, 8-32 Tapped Hole
$36.80
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
VH1/M Support Documentation
VH1/MMiniature V-Clamp, 0.42" Long, M4 Tapped Hole
$36.80
Today

Compact V-Mount and Platform Mount, 0.49" (12.4 mm) Long


Click for Details

PCM Clamp Used with PCMP Prism Base to Mount a Dove Prism Over the 1/4"-20 Tap of a Ø1/2" Post

Click to Enlarge

PCM Post Clamp Mounting a GRIN Fiber Collimator Using the PCMV V-Groove
Base Adapter
  • Post-Mount Prisms or Cylindrical Objects
  • PCM(/M) Ø1/2" Post Clamp Secures Objects Mounted on Base Adapters
  • PCMV(/M) V-Groove Adapter Holds Cylindrical Objects
    • Minimum Object Diameter: 0.02" (0.6 mm)
    • Maximum Object Diameter: 0.52" (13.2 mm)
  • PCMP(/M) Flat Adapter Holds Prisms or Beamsplitter Cubes
    • Maximum Optic Height: 0.82" (20.8 mm)
  • Adapters Mount to 1/4"-20 (M6) End of our Ø1/2" Optical Posts

Thorlabs' Compact Platform Mount is ideal for mounting cylindrical objects from 0.02" (0.6 mm) to 0.52" (13.2 mm) in diameter or prisms up to 0.82" (20.8 mm) tall onto a Ø1/2" Optical PostIts thin 0.65" (16.5 mm) profile allows the mount to easily fit into a space-constrained setup, where a larger mount could not. Please note that a complete post clamp mount will require a PCM(/M) Ø1/2" Post Clamp and either a PCMP(/M) Flat or PCMV(/M) V-Groove Base Adapter, all of which are sold separately.

The PCMP(/M) and PCMV(/M) Base Adapters thread onto the 1/4"-20 (M6) end of a Ø1/2" post to provide a stable mounting surface for prisms or cylindrical objects, respectively. To secure the mounted component, the PCM(/M) Post Clamp fits over the post and includes a PM3 or PM3/M Clamping Arm with nylon-tipped setscrew that can be adjusted using a 5/64" (2 mm) hex key. The post clamp is locked in place on the Ø1/2" post using a side-located thumbscrew that can also be secured using a 3/16" (5 mm) hex key. See the photo to the right for a mounting example.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PCM Support Documentation
PCMNEW!Post Clamp Mount for Ø1/2” (12.7 mm) Posts
$37.50
Today
PCMV Support Documentation
PCMVNEW!V-Groove Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
$16.00
Today
PCMP Support Documentation
PCMPNEW!Flat Base Adapter for PCM(/M) Mount, 1/4"-20 Threaded Stud
$16.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PCM/M Support Documentation
PCM/MNEW!Post Clamp Mount for Ø1/2” (12.7 mm) Posts
$37.50
Today
PCMV/M Support Documentation
PCMV/MNEW!V-Groove Base Adapter for PCM(/M) Mount, M6 Threaded Stud
$16.00
Today
PCMP/M Support Documentation
PCMP/MNEW!Flat Base Adapter for PCM(/M) Mount, M6 Threaded Stud
$16.00
Today

Small V-Clamp, 0.75" (19.1 mm) Long

0.75in long, Large V-Clamp
Click to Enlarge

Post-Mounted VC1 V-Clamp Holding a Fiber Collimation Package
  • Clamps Cylindrical Objects Ranging from Ø0.02" (0.5 mm) to Ø0.82" (20.8 mm)
  • Post Mountable via Two 8-32 (M4) Tapped Holes
  • One PM3(/M) Clamping Arm Included with Each Mount

The VC1(/M) Small, 0.75" (19.1 mm) Long V-Clamp is ideally suited for holding small cylindrical objects such as our Fiber Collimation Packages. Cylindrical objects are clamped in place using the nylon-tipped setscrew on the included PM3(/M) Clamping Arm (one included with each mount; additional arms are available below). This setscrew can be tightened with a 5/64" (2 mm) balldriver or hex key.

The PM3(/M) clamping arm is held to a post using a flexure locking mechanism that locks with the same 5/64" (2 mm) hex key. The post of the PM3(/M) includes a Ø0.09" (Ø2.3 mm) through hole that allows for extra torque to be applied when tightening.

This V-Clamp is equipped with one bottom-located and one side-located 8-32 (M4) tapped hole for post mounting. The side-located hole is opposite the clamping arm.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
VC1 Support Documentation
VC1Small V-Clamp with PM3 Clamping Arm, 0.75" Long
$38.90
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
VC1/M Support Documentation
VC1/MSmall V-Clamp with PM3/M Clamping Arm, 0.75" Long, Metric
$38.90
Today

Large V-Clamp, 2.5" (63.5 mm) Long

3in long, Large V-Clamp
Click to Enlarge

Post-Mounted VC3 V-Clamp Holding a Laser Diode Module
  • Clamps Cylindrical Objects Ranging from Ø0.26" (6.6 mm) to Ø2.04" (51.8 mm)
  • Post Mountable via Three 8-32 (M4) Tapped Holes
  • One PM4(/M) Clamping Arm Included with Each Mount

This 2.5" (63.5 mm) Long, Large V-Clamp is designed to hold large cylindrical objects such as our Laser Diode Modules. Cylindrical objects are clamped in place using the nylon-tipped setscrew on the included PM4(/M) Clamping Arm (one included with each mount; additional arms are available below). This setscrew can be tightened with a  5/64" (2 mm) balldriver or hex key.

The PM4(/M) clamping arm is held to a post using a flexure mechanism that locks with the same 5/64" (2 mm) hex key. The post of the PM4 includes a Ø0.09" (Ø2.3 mm) through hole that enables the use of added torque when tightening.

For extra clamping support, this V-clamp has two additional (three total) 6-32 (M4) tapped holes for use with extra PM4(/M) clamping arms. Three bottom-located 8-32 (M4) tapped holes are provided 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 / Ships
VC3 Support Documentation
VC3Large V-Clamp with PM4 Clamping Arm, 2.5" Long
$37.10
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
VC3/M Support Documentation
VC3/MLarge V-Clamp with PM4/M Clamping Arm, 2.5" Long, Metric
$37.10
Today

Large V-Clamp, 6" (152.4 mm) Long

6in long, Large V-Clamp
Click to Enlarge
Post-Mounted VC6 V-Clamp with an Additional PM4 Clamping Arm Holding a Ø1.74" (Ø44.2 mm) HeNe Tube Laser
  • Clamps Cylindrical Objects Ranging from Ø0.26" (6.6 mm) to Ø2.04" (Ø51.8 mm)
  • Post Mountable via Three 8-32 (M4) Tapped Holes or Six 1/4"-20 Counterbores
  • One PM4(/M) Clamping Arm Included with Each Mount

This 6" (152.4 mm) Long, Large V-Clamp is designed to secure long cylindrical objects, such as our HeNe Tube Lasers. Cylindrical objects are held in place using the nylon-tipped setscrew on the included PM4(/M) Clamping Arm (one included with each mount). This setscrew can be tightened with a  5/64" (2 mm) balldriver or hex key.

The PM4(/M) clamping arm is held to a post using a flexure mechanism that locks with the same 5/64" (2 mm) hex key. The post of the PM4 includes a Ø0.09" (Ø2.3 mm) through hole that enables the use of added torque when tightening.

For extra clamping support, seven additional (eight total) 6-32 (M4) tapped holes have been added for extra PM4 clamping arms (available below). This mount is equipped with six 1/4"-20 (M6) counterbores and three bottom-located 8-32 (M4) tapped holes for directly mounting the V-clamp to an optical breadboard or a post.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
VC6 Support Documentation
VC6Large V-Clamp with PM4 Clamping Arm, 6" Long
$61.80
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
VC6/M Support Documentation
VC6/MLarge V-Clamp with PM4/M Clamping Arm, 6" Long, Metric
$61.80
Today

Clamping Arms


Click to Enlarge

Clamping Arm Extension Posts with Metric Indicator Groove

Click for Details

Mechanical Drawings
  • Provide Clamping Force for Our Platform Mounts
  • 6-32 (M4) Threads on Top and Bottom of Post
  • PM3(/M): Holds Optics up to 0.97" (24.6 mm) Tall
  • PM4(/M): Holds Optics up to 1.61" (40.9 mm) Tall
  • Extension Posts Available to Increase Max Optic Height
    • PM3SP(/M) with PM3(/M): Hold Optics up to 2.21" (56.1 mm) Tall
    • PM4SP(/M) with PM4(/M): Hold Optics up to 3.61" (91.7 mm) Tall

Thorlabs' PM3(/M) and PM4(/M) Clamping Arms use a nylon-tipped setscrew with a 5/64" (2.0 mm) hex to secure optics to our kinematic platform mounts and V-clamps. The PM3(/M) accommodates optics up to 0.97" (24.6 mm) tall and features a 0.69" (17.5 mm) center-to-center distance between the post and the nylon-tipped setscrew. In contrast, the PM4(/M) accommodates optics up to 1.61" (40.9 mm) and features a 1.16" (29.3 mm) center-to-center distance between the post and the nylon-tipped setscrew. The maximum optic height of the PM3(/M) or PM4(/M) Clamping Arms can be extended using our PM3SP(/M) or PM4SP(/M) Extension Posts, respectively. These extension posts are identical to the posts included in each complete clamping arm.

The clamping arm for all items is held to the post using a flexure mechanism that locks with a 5/64" (2.0 mm) balldriver or hex key. The post also offers a through hole for added torque when tightening down the post. Please see the diagram above for additional information.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PM3 Support Documentation
PM3Small Adjustable Clamping Arm, 6-32 Threaded Post
$18.00
Today
PM3SP Support Documentation
PM3SPCustomer Inspired!Extension Post for PM3 Clamping Arm, 6-32 Threaded
$5.00
Today
PM4 Support Documentation
PM4Large Adjustable Clamping Arm, 6-32 Threaded Post
$22.00
Today
PM4SP Support Documentation
PM4SPCustomer Inspired!Extension Post for PM4 Clamping Arm, 6-32 Threaded
$5.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PM3/M Support Documentation
PM3/MSmall Adjustable Clamping Arm, M4 Threaded Post
$18.00
Today
PM3SP/M Support Documentation
PM3SP/MCustomer Inspired!Extension Post for PM3/M Clamping Arm, M4 Threaded
$5.00
Today
PM4/M Support Documentation
PM4/MLarge Adjustable Clamping Arm, M4 Threaded Post
$22.00
Today
PM4SP/M Support Documentation
PM4SP/MCustomer Inspired!Extension Post for PM4/M Clamping Arm, M4 Threaded
$5.00
Today
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