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Vacuum-Compatible Ø1/2" Post System


  • Ø1/2" Post System Components for Vacuum Use
  • All Components are Shipped Double Vacuum Bagged
  • Constructed of 316, 304L, and A4 Stainless Steel and
    6061-T6 and 2024-T3 Aluminum

Ø1/2" Posts

TR3V

TR2V

TR1V

BA1V

Ø1/2" Post Holder Base

Vacuum-Compatible Ø1/2"
Post System: TR3V, PH3V, and BA2V

PH2V

Ø1/2" Post Holder

SH25S063V

Vented Cap Screws

Related Items


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Vacuum Post Holder Packaging
Click to Enlarge

All vacuum-compatible components are packaged inside a double vacuum bag.

Additional Vacuum-Compatible Components

Many of our other Optomechanical Components can be special ordered for vacuum use. Contact techsupport@thorlabs.com for details.

Features

  • Vacuum-Compatible Versions of Popular Optomechanical Components
  • Ø1/2" Post System Includes Posts, Post Holders, Post Holder Bases, Thumbscrews, and Cap Screws
  • All Components Compatible with 10-6 Torr Environments Directly Out of the Packaging
  • Compatible with Lower Pressures with Additional User Processing
  • All Components are Shipped Double Vacuum Bagged for Cleanroom Use

This page features vacuum-compatible versions of our most popular optomechanical components. These components are fabricated from specially-selected grades of stainless steel and aluminum for vacuum and cleanroom use. As shown in the photo to the right, all components are packaged in double airtight bags for cleanroom and vacuum chamber applications.

Vacuum Compatibility Information
Our vacuum-compatible optomechanics 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 or stainless steel (see the Vacuum Specs tab or the Specs tables below). The material properties of the aluminum or stainless steel and the cleaning methods completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system.

We also offer other optomechanical components which may be used in vacuum applications. Many of our Polaris Mirror Mounts are vacuum-compatible. We also offer Unanodized Aluminum Breadboards, which may be used in vacuum applications after undergoing cleaning and processing by the end user.

Vacuum Compatibility Specs

ItemØ1/2" PostsØ1/2" Post HoldersPost Holder BasesThumbscrewsVented Cap Screws & Washers
Vacuum
Compatibility
as Packageda
>10-6 Torr
Materials 304L Stainless Steel (Post)
316 Stainless Steel (Setscrew)
6061-T6 Aluminum (Post Holder)
2024-T3 Aluminum (Thumbscrew)
353NDPK Epoxyb
Low Vacuum Pressure Grease
6061-T6 Aluminum 2024-T3 Aluminum 316 Stainless Steel (Imperial)
A4 Stainless Steel (Metric)
Preparation and
Packaging
Chemically Cleaned and Double Vacuum Bagged
Aluminum / Stainless
Steel Outgassing
Rate at 20 °C
1.8 x 10-8 Torr-Liters/s/cm2 7.6 x 10-9 Torr-Liters/s/cm2 7.6 x 10-9 Torr-Liters/s/cm2 1.8 x 10-8 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.

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Vacuum-Compatible Ø1/2" Posts

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 304L Stainless Steel (Post)
316 Stainless Steel (Setscrew)
Preparation and
Packaging
Chemically Cleaned and
Double Vacuum Bagged
Stainless Steel
Outgassing Rate at 20 °C
1.8 x 10-8 Torr-Liters/s/cm2
  • 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.
  • Constructed of 304L and 316 Stainless Steel for Vacuum Applications
  • One 8-32 (M4) Tapped Hole on Top and One 1/4"-20 (M6) Tapped Hole at Base
  • Removable 8-32 (M4) Threaded Setscrew
  • Available in Lengths Ranging from 3/4" to 3" (20 mm to 75 mm)
  • We Also Offer a Complete Line of Standard Ø1/2" Posts

These nonmagnetic, vacuum-compatible stainless steel posts are precision ground to Ø1/2" (Ø12.7 mm). One end has a 1/4"-20 (M6) tapped hole, while the other end has a removable, 8-32 (M4) threaded setscrew [5/46" (2 mm) hex]. A side-located Ø0.13" (Ø3.1 mm) hole is bored straight through the post; a balldriver can be inserted through the hole to provide extra leverage when tightening mounted components. This hole also serves to vent the 8-32 (M4) threaded hole. The 1/4"-20 (M6) hole in the bottom of the post is not vented, so we recommend using a vented capscrew (sold below).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
TR075V Support Documentation
TR075VØ1/2" Vacuum-Compatible Optical Post, 8-32 Setscrew, 1/4"-20 Tap, L = 0.75"
$10.45
Today
TR1V Support Documentation
TR1VØ1/2" Vacuum-Compatible Optical Post, 8-32 Setscrew, 1/4"-20 Tap, L = 1"
$11.03
Today
TR1.5V Support Documentation
TR1.5VØ1/2" Vacuum-Compatible Optical Post, 8-32 Setscrew, 1/4"-20 Tap, L = 1.5"
$13.03
Today
TR2V Support Documentation
TR2VØ1/2" Vacuum-Compatible Optical Post, 8-32 Setscrew, 1/4"-20 Tap, L = 2"
$13.34
Today
TR3V Support Documentation
TR3VØ1/2" Vacuum-Compatible Optical Post, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
$13.86
Today
+1 Qty Docs Part Number - Metric Price Available
TR20V/M Support Documentation
TR20V/MØ12.7 mm Vacuum-Compatible Optical Post, M4 Setscrew, M6 Tap, L = 20 mm
$10.45
Today
TR30V/M Support Documentation
TR30V/MØ12.7 mm Vacuum-Compatible Optical Post, M4 Setscrew, M6 Tap, L = 30 mm
$11.03
5-8 Days
TR40V/M Support Documentation
TR40V/MØ12.7 mm Vacuum-Compatible Optical Post, M4 Setscrew, M6 Tap, L = 40 mm
$13.03
Today
TR50V/M Support Documentation
TR50V/MØ12.7 mm Vacuum-Compatible Optical Post, M4 Setscrew, M6 Tap, L = 50 mm
$13.34
Today
TR75V/M Support Documentation
TR75V/MØ12.7 mm Vacuum-Compatible Optical Post, M4 Setscrew, M6 Tap, L = 75 mm
$13.86
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
Aluminum
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
  • Extra Wide Relief Cut Provides a Two-Line Stable Contact for Post
  • 1/4"-20 (M6) Tapped Hole on Bottom
  • We Also Offer a Complete Line of Standard Ø1/2" Post Holders

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. 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 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).

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
$31.83
Today
PH1.5V Support Documentation
PH1.5VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 1.5", Vacuum Compatible
$33.16
Today
PH2V Support Documentation
PH2VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 2", Vacuum Compatible
$33.95
Today
PH3V Support Documentation
PH3VØ1/2" Post Holder with Hex-Locking Thumbscrew, L = 3", Vacuum Compatible
$36.61
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
$31.83
Today
PH30V/M Support Documentation
PH30V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 30 mm, Vacuum Compatible
$32.09
Today
PH40V/M Support Documentation
PH40V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 40 mm, Vacuum Compatible
$33.16
Today
PH50V/M Support Documentation
PH50V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 50 mm, Vacuum Compatible
$33.95
Today
PH75V/M Support Documentation
PH75V/MØ12.7 mm Post Holder with Hex-Locking Thumbscrew, L = 75 mm, Vacuum Compatible
$36.61
Today

Vacuum-Compatible Bases

Item #BA1SV(/M)BA1V(/M)BA2V(/M)
Image
(Click to Enlarge)
BA1SVBA1VBA2V
Slots122
Slot TypeStraightStraightStraight
Slot Length1.10" (27.9 mm)0.81" (20.1 mm)
1.25" (31.8 mm)
Mounting Holes113
Dimensions (W x L x H)1" x 2.3" x 3/8"
(25 mm x 58 mm x 10 mm)
1" x 3" x 3/8"
(25 mm x 75 mm x 10 mm)
2" x 3" x 3/8"
(50 mm x 75 mm x 10 mm)
Vacuum Compatibility>10-6 Torra
Material6061-T6 Aluminum
Outgassing Rate at 20 °C 7.6 x 10-9 Torr-Liters/s/cm2
PackagingDouble Vacuum Bagged
  • This is the pressure at which these components can be used directly out of the packaging with no additional processing. They can be used at even lower pressures with additional cleaning and processing.
  • Mount Ø1/2" Post Holders and Other Components to an Optical Table or Breadboard
  • Vacuum-Compatible Design (>10-6 Torr)
  • Double Vacuum Bagged for Cleanroom Environments
  • Same Stability and Footprint as Our Standard Mounting Bases

These vacuum-compatible bases are similar to our standard mounting bases, which allow post holders to be secured to an optical table in a variety of position. A 3/8" (10 mm) long 1/4"-20 (M6) vented cap screw (SH25S038V or SH6MS10V, respectively, sold below) is recommended for attaching post holders to our mounting bases.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
BA1SV Support Documentation
BA1SVMounting Base, 1" x 2.3" x 3/8", Vacuum Compatible
$13.13
Today
BA1V Support Documentation
BA1VMounting Base, 1" x 3" x 3/8", Vacuum Compatible
$13.13
Lead Time
BA2V Support Documentation
BA2VMounting Base, 2" x 3" x 3/8", Vacuum Compatible
$18.49
Today
+1 Qty Docs Part Number - Metric Price Available
BA1SV/M Support Documentation
BA1SV/MMounting Base, 25 mm x 58 mm x 10 mm, Vacuum Compatible
$13.13
Today
BA1V/M Support Documentation
BA1V/MMounting Base, 25 mm x 75 mm x 10 mm, Vacuum Compatible
$13.13
Today
BA2V/M Support Documentation
BA2V/MMounting Base, 50 mm x 75 mm x 10 mm, Vacuum Compatible
$18.49
Today

Vacuum-Compatible Thumbscrews

Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 2024-T3 Aluminum
Preparation and
Packaging
Chemically Cleaned and
Double Vacuum Bagged
Aluminum Outgassing
Rate at 20 °C
7.6 x 10-9 Torr-Liters/s/cm2
Maximum Torque 28 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.

The TS25HV and TS6HV/M are 1/4"-20 or M6 x 1.0-threaded for compatibility with our imperial or metric Vacuum-Compatible Ø1/2" Post Holders, respectively. Please note that we do not recommend using an L wrench hex key to tighten these thumbscrews, as this may break off the screw head. The recommended maximum torque is 28 in·lbs (3.2 N·m). We also offer standard spring-loaded thumbscrews.

TS25HV Mechanical Drawing
TS25HV Drawing
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
$10.95
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
$10.61
Today

Vented, Vacuum-Compatible Cap Screws and Washers

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 316 Stainless Steel (Imperial)
A4 Stainless Steel (Metric)
Preparation and
Packaging
Chemically Cleaned and
Double Vacuum Bagged
Stainless Steel
Outgassing Rate at 20 °C
1.8 x 10-8 Torr-Liters/s/cm2
  • 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.
Vented Cap Screw
Click to Enlarge

These Cap Screws Have a Central Ø0.0625" (Ø1.6 mm) Vent
  • 1/4"-20 and M6 x 1.0 Cap Screws with Vents for Vacuum Applications
  • 1/4" (M6) Vacuum-Compatible Washers
  • Constructed of 316 or A4 Stainless Steel
  • Vacuum-Compatible Design (>10-6 Torr)
  • Double Vacuum Bagged for Cleanroom Environments
  • We Also Offer Standard Cap Screws in a Variety of Sizes

These cap screws and washers are constructed from 316 or A4 stainless steel. They have a central Ø0.0625” (Ø1.6 mm) hole through the body of the screw to serve as a vent, allowing trapped gas to escape from a blind hole when a vacuum chamber is pumped down.

Item # Length Hex Material Quantity
SH25S038V 3/8" (9.5 mm) 3/16" 316 Stainless Steel 5
SH25S050V 1/2" (12.7 mm) 5
SH25S063V 5/8" (15.9 mm) 5
SH25S075V 3/4" (19.1 mm) 5
SH25S100V 1" (25.4 mm) 5
SH6MS10V 10 mm (0.39") 5 mm A4 Stainless Steel 5
SH6MS12V 12 mm (0.47") 5
SH6MS16V 16 mm (0.63") 5
SH6MS20V 20 mm (0.79") 5
SH6MS25V 25 mm (0.98") 5
W25S050V 1/4" Washer (M6 Compatible) 316 Stainless Steel 25
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
SH25S038V Support Documentation
SH25S038V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 3/8” Long, 5 Pack
$10.29
Today
SH25S050V Support Documentation
SH25S050V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 1/2” Long, 5 Pack
$11.99
Today
SH25S063V Support Documentation
SH25S063V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 5/8” Long, 5 Pack
$12.51
Today
SH25S075V Support Documentation
SH25S075V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 3/4” Long, 5 Pack
$14.64
Today
SH25S100V Support Documentation
SH25S100V1/4"-20 Vacuum-Compatible Vented Cap Screw, 316 Stainless, 1” Long, 5 Pack
$21.12
Today
+1 Qty Docs Part Number - Universal Price Available
W25S050V Support Documentation
W25S050V1/4" (M6) Vacuum-Compatible Washer, 316 Stainless, 25 Pack
$7.51
Today
+1 Qty Docs Part Number - Metric Price Available
SH6MS10V Support Documentation
SH6MS10VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 10 mm Long, 5 Pack
$7.58
Today
SH6MS12V Support Documentation
SH6MS12VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 12 mm Long, 5 Pack
$12.63
Today
SH6MS16V Support Documentation
SH6MS16VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 16 mm Long, 5 Pack
$13.58
Today
SH6MS20V Support Documentation
SH6MS20VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 20 mm Long, 5 Pack
$17.19
Today
SH6MS25V Support Documentation
SH6MS25VM6 x 1.0 Vacuum-Compatible Vented Cap Screw, A4 Stainless, 25 mm Long, 5 Pack
$24.40
Today
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