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Ø1/2" Post Holders


  • Extra Wide Relief Cut Provides a Highly Stable Two-Line Contact with the Mating Post
  • Each Post Holder Includes One Spring-Loaded or Solid Hex-Locking Thumbscrew
  • Vacuum-Compatible Versions Available

Standard and Vacuum-Compatible Post Holders

Magnets in Pedestal Post Holders Provide Holding Force Before Lockdown

CF175

Pedestal Post Holders

Thumbscrews

PH2E

PH6E

PH4E

PH3E

PH2E

PH1.5E

PH1E

PH082E

BE1

Pedestal Adapter

PH6

PH4

PH3V

PH2

PH1.5V

PH1

TS25HV

TS25H

Post Holder Secured by Clamping Fork

Related Items


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Post Holder Relief Cut
Post Holders Have an Extra Wide Relief Cut for Two-Line Contact with Ø1/2" Posts

Features

  • Precision-Machined Extra Wide Relief Cut Provides Stable Two-Line Contact with Ø1/2" Posts
  • Variety of Mounting Mechanisms Include Bottom-Located 1/4"-20 (M6) Tapped Hole or Magnetic Base
  • Extra Thumbscrews Also Available Below

Thorlabs' Ø1/2" optical post holders are the ideal solution for mounting optical components when a specific height for a setup has not been determined. These post holders come in several styles: standard, vacuum compatible, and pedestal.

Standard Post Holders
Standard post holders can be mounted to any one of our Mounting Bases via a 1/4"-20 (M6) cap screw. Each includes a spring-loaded thumbscrew that holds the post in place before tightening.

Vacuum-Compatible Post Holders
Vacuum-compatible post holders are constructed from 6061-T6 and 2024-T3 aluminum and are compatible with our Vacuum-Compatible Mounting Bases. They are similar to our standard post holders but have a chemically cleaned finish instead of the standard black anodization. This allows them to be used directly out of the packaging at pressures as low as 10-6 Torr, or at even lower pressures with additional cleaning and processing. They also incorporate a one-piece thumbscrew instead of the standard spring-loaded design found on our other post holders.

Pedestal Post Holders
Pedestal post holders have a base that works in conjunction with the clamping forks featured below for flexible mounting options on an optical table. They incorporate high-strength magnets in the base to provide holding force while performing rough alignments. Standard post holders can also be converted to pedestal post holders using the BE1(/M) or BE1R(/M) base adapters, which are also available below.

In addition to the post holder options presented here, Thorlabs also offers swivel post holders, which have an attached swivel base, and other specialty post holders.

Key Features
Type Standard Post Holders Vacuum-Compatible Post Holders Pedestal Post Holders
Post Contact Precision-Machined Extra Wide Relief Cut for Stability
Optical Table Mounting Bottom-Located 1/4"-20 (M6) Tapped Hole Compatible with CF038-P5, CF125, CF175,
CF038C(/M)-P5, CF125C(/M), and CF175C(/M) Clamping Forks
(Sold Below)
Thumbscrew Spring Loaded with 3/16" (5 mm) Hex One Piece with 3/16" (5 mm) Hex Spring Loaded with 3/16" (5 mm) Hex
Vacuum Compatibility N/A >10-6 Torr (Lower Pressures with Additional Cleaning) N/A
Construction Black Anodized Aluminum 6061-T6 and 2024-T3 Aluminum Black Anodized Aluminum

Posted Comments:
user  (posted 2015-09-30 12:53:55.707)
Could you please sell 25mm metric post holders (PH25/M). You used to sell metric versions of the 1" high posts, which were really convenient. Often the 20mm are too short to provide any height adjustment and the 30mm are too high for many of our applications.
besembeson  (posted 2015-10-08 02:58:30.0)
Response from Bweh at Thorlabs USA: Thanks for the feedback. We offer the 20mm and 30mm versions with the hope that the various TR series post lengths (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_ID=1266) will add flexibility to cover several height requirements for most applications.
user  (posted 2014-02-24 17:46:10.957)
Do you have a vacuum compatible post? Wondered how we can use the vacuum compatible post holder?
cdaly  (posted 2014-02-25 05:58:33.0)
Response from Chris at Thorlabs: Thank you for your inquiry. The TR series of posts are somewhat vacuum compatible as they are now as they are made of 303 stainless steel. The only issue is that a small amount of gas may become trapped when the stud is threaded into the top of the post. Ideally, the tapped hole and stud should have a way to vent. These are on our list of standard optomechanics which we will be adding vacuum compatible versions of in the near future.
cdaly  (posted 2012-11-30 16:23:48.81)
Response from Chris at Thorlabs: Thank you for using our feedback feature. We are unable to provide 2010 SolidWorks files directly as the version we use for design (2012) restricts us from creating backwards compatible files, but we do have Step files available for download as well. These files can be opened in SolidWorks 2010 and then saved as an .sldprt file, which will give you the format you require.
xiaoqiang026403  (posted 2012-11-29 01:43:38.617)
I use SolidWorks 2010,but some of your products' Drawing and Documents (SolidWorks) are opened by SolidWorks 2012. Could you send the SolidWorks Documents in version 2010?
bdada  (posted 2012-02-02 19:08:00.0)
Response from Buki at Thorlabs: The post holder is made from aluminum, which is non magnetic. This information is included in the overview of the product on the web page. Please contact TechSupport@thorlabs.com if you want to discuss your application further.
shane  (posted 2012-02-02 17:13:49.0)
Could you tell me what materials are used in these post holders? We have an application for which we need non-magnetic parts. Could you suggest another product if these wouldn't work? Thanks.
Tyler  (posted 2008-07-02 08:06:32.0)
A response from Tyler at Thorlabs to aidi: The PH1E and other post holders in that series can be secured to an optical breadboard using either a CF125 or a CF175 clamping fork. Thank you for your feedback; your comment allows us to improve our web presentation so that all of the future viewers of this page will have a clearer understanding of our product line.
aidi  (posted 2008-07-01 22:05:12.0)
Please suggest me what item should I have to fix this post holder to the breadboard. Thank you.

Standard Ø1/2" Post Holders

TS25 Spring Loaded Thumbscrew
Click to Enlarge

Standard Post Holders Include a Spring-Loaded Thumbscrew that Holds Posts in Place Before Tightening
  • Aluminum, Spring-Loaded, Hex-Locking Thumbscrew (3/16" or 5 mm) for Positioning Ease
  • Extra Wide Relief Cut Provides a Two-Line Stable Contact for Post
  • 1/4"-20 (M6) Tapped Hole on Bottom
  • Packs of 5 Also Available for 1" to 4" Lengths (20 mm to 100 mm)

These standard post holders are designed with a wide, square relief cut that provides two lines of contact for highly stable post mounting. A spring-loaded plunger within the aluminum thumbscrew holds a steel post firmly within the post holder prior to final tightening. This design allows one-handed positioning of post-mounted devices. Thorlabs' imperial and metric post holders are equipped with our 3/16" (TS25H) and 5 mm (TS6H/M) spring-loaded hex-locking thumbscrews, respectively (also available separately below). These thumbscrews should not be tightened beyond the maximum torque of 28 in·lbs (3.2 N·m). The post holders are compatible with our entire line of table bases and the BE1(/M) and BE1R(/M) base adapters (sold separately below).

Popular post holders are also available in packages of five for ease of ordering.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PH1 Support Documentation
PH1Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 1"
$7.03
Today
PH1-P5 Support Documentation
PH1-P5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 1", 5 Pack
$35.15
Today
PH1.5 Support Documentation
PH1.5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 1.5"
$7.22
Today
PH1.5-P5 Support Documentation
PH1.5-P5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=1.5", 5 Pack
$36.10
Today
PH2 Support Documentation
PH2Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
$7.70
Today
PH2-P5 Support Documentation
PH2-P5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2", 5 Pack
$38.50
Today
PH3 Support Documentation
PH3Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
$8.27
Today
PH3-P5 Support Documentation
PH3-P5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3", 5 Pack
$41.35
Today
PH4 Support Documentation
PH4Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4"
$9.17
Today
PH4-P5 Support Documentation
PH4-P5Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 4", 5 Pack
$45.85
Today
PH6 Support Documentation
PH6Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 6"
$12.64
Today
+1 Qty Docs Part Number - Metric Price Available
PH20/M Support Documentation
PH20/MCustomer Inspired! Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=20 mm
$7.03
Today
PH20/M-P5 Support Documentation
PH20/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=20 mm, 5 Pack
$35.15
Today
PH30/M Support Documentation
PH30/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=30 mm
$7.03
Today
PH30/M-P5 Support Documentation
PH30/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=30 mm, 5 Pack
$35.15
Today
PH40/M Support Documentation
PH40/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=40 mm
$7.22
Today
PH40/M-P5 Support Documentation
PH40/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=40 mm, 5 Pack
$36.10
Today
PH50/M Support Documentation
PH50/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
$7.70
Today
PH50/M-P5 Support Documentation
PH50/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm, 5 Pack
$38.50
Today
PH75/M Support Documentation
PH75/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm
$8.27
Today
PH75/M-P5 Support Documentation
PH75/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm, 5 Pack
$41.35
Today
PH100/M Support Documentation
PH100/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm
$9.17
5-8 Days
PH100/M-P5 Support Documentation
PH100/M-P5Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=100 mm, 5 Pack
$45.85
Today
PH150/M Support Documentation
PH150/MØ12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=150 mm
$12.64
Today

Vacuum-Compatible Ø1/2" Post Holders

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 6061-T6 and 2024-T3 Aluminum
353NDPK Epoxyb
Low Vacuum Pressure Grease
Preparation and
Packaging
Chemically Cleaned and
Double Vacuum Bagged
Stainless Steel
Outgassing Rate
at 20 °C
7.6 x 10-9 Torr-Liters/s/cm2
Additional
Vacuum
Compatibility
Information
Grease Vapor Pressure: 10-13 Torr at 20 °C ,10-5 Torr at 200 °C
Epoxy Meets Low Outgassing Standards NASA ASTM E595
and Telcordia GR-1221
  • This is the pressure at which these components can be used with no additional processing. They can be used at even lower pressures with additional cleaning and processing.
  • Click here to view the 353NDPK datasheet.
  • Vacuum-Compatible, Unanodized Design (>10-6 Torr)
  • Double Vacuum Bagged for Cleanroom Environments
  • One-Piece Thumbscrew for Reduced Outgassing
  • Extra Wide Relief Cut Provides a Two-Line Stable Contact for Post
  • 1/4"-20 (M6) Tapped Hole on Bottom

These vacuum-compatible post holders are constructed from 6061-T6 and 2024-T3 aluminum and are designed with a wide, square relief cut that provides two lines of contact for highly stable post mounting. They are compatible with our vacuum-compatible post holder bases.

Vacuum Post Holder Packaging
Click to Enlarge

These post holders are packaged inside a double vacuum bag.

Our vacuum-compatible post holders are chemically cleaned and prepared for vacuum applications before packaging. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the aluminum, epoxy, and grease (see the table to the right). The material properties of the 6061-T6 and 2024-T3 aluminum and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr.

Our vacuum-compatible post holders are packaged in double airtight bags for cleanroom and vacuum chamber applications. The imperial and metric post holders are equipped with our 3/16" (TS25HV) and 5 mm (TS6HV/M) vacuum-compatible hex-locking thumbscrews, respectively (also available separately below).

Please note that we do not recommend using an L wrench hex key to tighten the thumbscrews included with these post holders, as this may break off the screw head. The recommended maximum torque is 28 in·lbs (3.2 N·m).

We also offer additional vacuum-compatible Ø1/2" post system components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PH1V Support Documentation
PH1VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 1", Vacuum Compatible
$30.90
Today
PH1.5V Support Documentation
PH1.5VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 1.5", Vacuum Compatible
$32.19
Today
PH2V Support Documentation
PH2VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 2", Vacuum Compatible
$32.96
Today
PH3V Support Documentation
PH3VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 3", Vacuum Compatible
$35.54
Today
+1 Qty Docs Part Number - Metric Price Available
PH20V/M Support Documentation
PH20V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 20 mm, Vacuum Compatible
$30.90
Today
PH30V/M Support Documentation
PH30V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 30 mm, Vacuum Compatible
$31.16
5-8 Days
PH40V/M Support Documentation
PH40V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 40 mm, Vacuum Compatible
$32.19
Today
PH50V/M Support Documentation
PH50V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 50 mm, Vacuum Compatible
$32.96
5-8 Days
PH75V/M Support Documentation
PH75V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 75 mm, Vacuum Compatible
$35.54
5-8 Days

Ø1/2" Pedestal Post Holders

TS25 Spring Loaded Thumbscrew
Click to Enlarge

Pedestal Post Holders Include a Spring-Loaded Thumbscrew that Holds Posts in Place Before Tightening
  • Aluminum, Spring-Loaded, Hex-Locking Thumbscrew (3/16" or 5 mm) for Positioning Ease
  • Three High Strength Magnets in Base Provide Holding Force Prior to Fastening
  • Extra Wide Relief Cut Provides a Two-Line Stable Contact for Post
  • Post can Pass Through Base Allowing Minimal Beam Height

Thorlabs' pedestal-style post holders combine the versatility of our standard post holders with the small footprint of the pedestal and fork design. The post holder can be locked down to an optical breadboard using a CF series clamping fork (see below). The fork can be swiveled 360° to pick the most convenient mounting hole. To further enhance this mounting system, magnets have been added to allow temporary positioning of the post holder prior to lockdown. The through hole design allows the maximum range of post height adjustment. Thorlabs' imperial and metric Pedestal-Style Post Holders are equipped with our 3/16" (TS25H) and 5 mm (TS6H/M) spring-loaded-hex locking thumbscrews, respectively (available below). These thumbscrews should not be tightened beyond the maximum torque of 28 in·lbs (3.2 N·m).

To order these pedestal post holders without magnets, please contact Tech Support.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PH082E Support Documentation
PH082EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=1.00"
$23.46
Today
PH1E Support Documentation
PH1EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=1.19"
$23.46
Today
PH1.5E Support Documentation
PH1.5EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=1.69"
$23.97
Today
PH2E Support Documentation
PH2EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=2.19"
$24.48
Today
PH3E Support Documentation
PH3EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=3.19"
$24.99
Today
PH4E Support Documentation
PH4EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=4.19"
$25.50
Today
PH6E Support Documentation
PH6EØ1/2" Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=6.19"
$27.80
Today
+1 Qty Docs Part Number - Metric Price Available
PH20E/M Support Documentation
PH20E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=25 mm
$23.46
Today
PH30E/M Support Documentation
PH30E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex Locking Thumbscrew, L=34.7 mm
$23.46
Today
PH40E/M Support Documentation
PH40E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=44.7 mm
$23.97
Today
PH50E/M Support Documentation
PH50E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=54.7 mm
$24.48
Today
PH75E/M Support Documentation
PH75E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=79.7 mm
$24.99
Today
PH100E/M Support Documentation
PH100E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=104.7 mm
$25.50
Today
PH150E/M Support Documentation
PH150E/MØ12.7 mm Pedestal Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=154.7 mm
$27.80
Today

Clamping Forks and Base Adapters


Click to Enlarge

The BE1R has a magnet in the base for stability in temporary setups.
BE1 Includes a Hex Key for Mounting
Click to Enlarge
These base adapters feature a 1/8" (3 mm) hex socket on the bottom for tightening.

Click to Enlarge

The CF038C(/M)-P5, CF125C(/M), and CF175C(/M) each offer a captive screw.
PH2 on a BE1 Base
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE11Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR1.51Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
LMR11Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
SH25S05011/4"-20 Stainless Steel Cap Screw, 1/2" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
View Metric Product List
Item #QtyDescription
Metric Product List
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE1/M1Ø31.8 mm Studded Pedestal Base Adapter, M6 Thread
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR40/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 40 mm
LMR1/M1Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
SH6MS121M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
Ø1/2" Post Holder Mounted to an Optical Table Using a CF125 Clamping Fork and BE1 Base Adapter

Click to Enlarge

Clamping forks are available with three slot lengths.
  • BE1(/M) and BE1R(/M) Adapters Convert Standard Ø1/2" Post Holders and Ø1" Post Extensions into Pedestal-Style Mounts
  • Clamping Fork or CL8 Table Clamp Secures Pedestal-Style Mount to a Breadboard or Optical Table
  • Three Sizes Provide Clamping with 1/4"-20 (M6) Cap Screws
    • 0.38" (9.5 mm) Long Counterbored Slot [CF038-P5 and CF038C(/M)-P5]
    • 1.24" (31.5 mm) Long Counterbored Slot [CF125 and CF125C(/M)]
    • 1.76" (44.8 mm) Long Counterbored Slot [CF175 and CF175C(/M)]
  • Swivel Fork 360° to Select Most Convenient Mounting Hole
  • CF038C(/M)-P5, CF125C(/M), and CF175C(/M) Each Include a 1/4"-20 (M6)-Threaded Captive Screw
  • BE1(/M) and All Clamping Forks Available in Packs of Five [CF038-P5 and CF038C(/M)-P5 Not Sold Individually]

Pedestal Base Adapters
The BE1(/M) pedestal base adapter features a 1/4"-20 (M6)-threaded stud, that fits into the bottom of our standard Ø1/2" post holders or Ø1" post extensions to convert them into pedestal-style mounts for added stability. The BE1R(/M) adapter has a magnet in the base that is sufficiently strong to securely hold the base in place without clamping to an optical table (see photo at the top right). Made from solid 303 stainless steel with a 1.25" (31.8 mm) outer diameter, these adapters allow our standard Ø1/2" post holders to be used with the clamping forks sold below.

The BE1(/M) base adapter is available in a pack of five for ease of ordering.

Clamping Forks
These clamping forks are designed to provide exceptional clamping force when used with our Ø1/2" post holders and Ø1" post extensions that have been adapted using the BE1(/M) to pedestal-style mounts. They can also be used with our pedestal-style Ø1/2" post holders or Ø1" pedestal posts without any need for the BE1(/M).

Fabricated from solid 303 stainless steel, all of these clamping forks create three points of contact with the table for high stability. For flexibility in the positioning of post assemblies, the CF038-P5 and CF038C(/M)-P5 forks have 0.38" (9.5 mm) long counterbored slots, the CF125 and CF125C(/M) forks have 1.24" (31.5 mm) long counterbored slots, and the CF175 and CF175C(/M) forks have 1.76" (44.8 mm) long counterbored slots. The counterbored slots on the CF038-P5, CF125, and CF175 forks are designed for user-supplied 1/4"-20 (M6)-threaded cap screws. For further convenience, the CF038C(/M)-P5, CF125C(/M), and CF175C(/M) forks each include a 1/4"-20 (M6)-threaded captive screw. Please note that significant over tightening of clamping forks can deform the surface of an optical table, which can cause misalignment of components and decrease stability.

Our clamping forks are also available in packages of five for ease of ordering (note: the CF038-P5 and CF038C(/M)-P5 clamping forks are only available in packs of five).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
BE1 Support Documentation
BE1Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread
$9.49
Today
BE1-P5 Support Documentation
BE1-P5Customer Inspired! Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread, 5 Pack
$47.43
Today
BE1R Support Documentation
BE1RCustomer Inspired! Ø1.25" Magnetic Studded Pedestal Base Adapter, 1/4"-20 Thread
$16.73
Today
CF038C-P5 Support Documentation
CF038C-P5Clamping Fork, 0.38" Counterbored Slot, 1/4"-20 Captive Screw, 5 Pack
$48.20
Today
CF125C Support Documentation
CF125CCustomer Inspired! Clamping Fork, 1.24" Counterbored Slot, 1/4"-20 Captive Screw
$11.02
Today
CF125C-P5 Support Documentation
CF125C-P5Clamping Fork, 1.24" Counterbored Slot, 1/4"-20 Captive Screw, 5 Pack
$52.46
Today
CF175C Support Documentation
CF175CCustomer Inspired! Clamping Fork, 1.76" Counterbored Slot, 1/4"-20 Captive Screw
$12.04
Today
CF175C-P5 Support Documentation
CF175C-P5Clamping Fork, 1.76" Counterbored Slot, 1/4"-20 Captive Screw, 5 Pack
$57.57
Today
+1 Qty Docs Part Number - Universal Price Available
CF125 Support Documentation
CF125Clamping Fork, 1.24" Counterbored Slot, Universal
$8.95
Today
CF125-P5 Support Documentation
CF125-P5Clamping Fork, 1.24" Counterbored Slot, Universal, 5 Pack
$42.45
Today
CF175 Support Documentation
CF175Clamping Fork, 1.76" Counterbored Slot, Universal
$10.30
Today
CF175-P5 Support Documentation
CF175-P5Clamping Fork, 1.76" Counterbored Slot, Universal, 5 Pack
$48.91
Today
+1 Qty Docs Part Number - Metric Price Available
BE1/M Support Documentation
BE1/MØ31.8 mm Studded Pedestal Base Adapter, M6 Thread
$9.49
Today
BE1/M-P5 Support Documentation
BE1/M-P5Customer Inspired! Ø31.8 mm Studded Pedestal Base Adapter, M6 Thread, 5 Pack
$47.43
Today
BE1R/M Support Documentation
BE1R/MCustomer Inspired! Ø31.8 mm Magnetic Studded Pedestal Base Adapter, M6 Thread
$16.73
Today
CF038C/M-P5 Support Documentation
CF038C/M-P5Clamping Fork, 9.5 mm Counterbored Slot, M6 x 1.0 Captive Screw, 5 Pack
$48.20
Today
CF125C/M Support Documentation
CF125C/MCustomer Inspired! Clamping Fork, 31.5 mm Counterbored Slot, M6 x 1.0 Captive Screw
$11.02
Today
CF125C/M-P5 Support Documentation
CF125C/M-P5Clamping Fork, 31.5 mm Counterbored Slot, M6 x 1.0 Captive Screw, 5 Pack
$52.46
Today
CF175C/M Support Documentation
CF175C/MCustomer Inspired! Clamping Fork, 44.8 mm Counterbored Slot, M6 x 1.0 Captive Screw
$12.04
Today
CF175C/M-P5 Support Documentation
CF175C/M-P5Clamping Fork, 44.8 mm Counterbored Slot, M6 x 1.0 Captive Screw, 5 Pack
$57.57
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Swivel Base Adapter

  • Convert Your Existing Post Holders into Universal Post Holder Style Mounts
  • 360° Swiveling Base Fastens to Existing Ø1/2" Post Holders via a 1/4"-20 (M6) Cap Screw
  • Magnets in Base Hold Position of Components on Breadboard During Initial Setup
  • Also Available in Packs of Five

Our 360° swivel base adapter fits standard Ø1/2" post holders with 1/4"-20 (M6) mounting holes and minimizes the amount of time it takes to assemble an optical system. In addition, the swivel design is ideal for applications that require a large number of components to be packed into a small area. When our Ø1/2" post holders are used with this adapter, the combination is nearly that of our very popular Universal Post Holders. This anodized aluminum adapter has the benefit of compatibility with any of our existing Ø1/2" post holders but does not offer the same height flexibility of the swiveling post holders, which allow the post to be lowered all the way to the table. For ease of ordering, these base adapters are also available in packs of five.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
UPHA Support Documentation
UPHASwivel Base Adapter
$20.71
Today
UPHA-P5 Support Documentation
UPHA-P5Swivel Base Adapter, 5 Pack
$101.49
Today

Spring-Loaded 1/4"-20 and M6 x 1.0 Thumbscrews for Post Holders

Specification
Maximum Torquea 28 in·lbs (3.2 N·m)
  • Please note that we do not recommend using an L wrench to tighten the thumbscrew, as this may break off the screw head.

Click to Enlarge

Exploded View of the TS25H Thumbscrew
TS25H Mechanical Drawing
TS25H Drawing

These hex-locking, anodized aluminum thumbscrews have spring-loaded, completely retractable Delrin™ tips that provide sufficient force on a post to hold it in place as final positional adjustments are being made. They can then be locked into place using a 3/16" (for the TS25H) or 5 mm (for the TS6H/M) balldriver to prevent any further movement of the post. The hex size is also engraved on the face of the thumbscrew, thereby enabling easy identification in the lab.

The TS25H has 1/4"-20 threads while the TS6H/M has M6 x 1.0 threads for compatibility with our imperial and metric Ø1/2" post holders, respectively. The recommended maximum torque is 28 in·lbs (3.2 N·m). Please note that we do not recommend using an L wrench to tighten the thumbscrew, as this may break off the screw head.

If a thumbscrew without a spring-loaded tip is preferred, we recommend our vacuum-compatible thumbscrews, sold below. Alternatively, the tips can be removed from these thumbscrews by unthreading the setscrew in the front of the thumbscrew with a 1/16" (1.5 mm) balldriver. The spring and tip can then be removed from the thumbscrew, in the order shown in the image to the right. However, the resulting contact face of the thumbscrew will have a center hole, unlike the contact face of our vacuum-compatible thumbscrews.

For ease of ordering, these thumbscrews are available individually or in packages of five.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
TS25H Support Documentation
TS25HSpring-Loaded 3/16" Hex-Locking Thumbscrew, 1/4"-20 Thread
$2.50
Today
TS25H-P5 Support Documentation
TS25H-P5Spring-Loaded 3/16" Hex-Locking Thumbscrew, 1/4"-20 Thread, 5 Pack
$12.50
Today
+1 Qty Docs Part Number - Metric Price Available
TS6H/M Support Documentation
TS6H/MSpring-Loaded 5 mm Hex-Locking Thumbscrew, M6 x 1.0 Thread
$2.50
Today
TS6H/M-P5 Support Documentation
TS6H/M-P5Spring-Loaded 5 mm Hex-Locking Thumbscrew, M6 x 1.0 Thread, 5 Pack
$12.50
Today

Vacuum-Compatible 1/4"-20 and M6 x 1.0 Thumbscrews for Post Holders

Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials2024-T3 Aluminum
Preparation and PackagingChemically Cleaned and Double Vacuum Bagged
Aluminum Outgassing Rate7.6 x 10-9 Torr-Liters/s/cm2
Maximum Torqueb28 in·lbs (3.2 N·m)
  • This is the pressure at which these components can be used with no additional processing. They can be used at even lower pressures with additional cleaning and processing.
  • Please note that we do not recommend using an L wrench to tighten the thumbscrew, as this may break off the screw head.
TS25HV Mechanical Drawing
TS25HV Drawing

These hex-locking thumbscrews are constructed from 2024-T3 aluminum and chemically cleaned and prepared for vacuum applications before packaging. They are compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the aluminum, which is 7.6 x 10-9 Torr-Liters/s/cm2. The material properties of the 2024-T3 aluminum and the cleaning methods that are completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system operating at pressures under 10-6 Torr.

These unanodized thumbscrews are packaged in double airtight bags for cleanroom and vacuum chamber applications.

The thumbscrews may be adjusted using our selection of balldrivers. The TS25HV has 1/4"-20 threads while the TS6HV/M has M6 x 1.0 threads for compatibility with our imperial or metric Vacuum-Compatible Ø1/2" Post Holders, respectively. We also offer additional vacuum-compatible Ø1/2" post system components.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
TS25HV Support Documentation
TS25HV3/16" Hex-Locking Thumbscrew, 1/4"-20 Thread, Vacuum Compatible
$6.75
Today
+1 Qty Docs Part Number - Metric Price Available
TS6HV/M Support Documentation
TS6HV/M5 mm Hex-Locking Thumbscrew, M6 x 1.0 Thread, Vacuum Compatible
$6.75
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