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Vacuum-Compatible Ø1" Post System


  • Ø1" Post System Components for Vacuum Use
  • All Components are Shipped Double Vacuum Bagged
  • Constructed of 316, 303, and A4 Stainless Steel and
    6061-T6 Aluminum

SH25S063V

Vented Cap Screws

BA1V

Ø1/2" Post Holder Base

POLARIS-MA45

45° Mounting Adapter

POLARIS-CA1

Clamping Arm

PLS-P150

Ø1" Post

PLS-P1

Ø1" Post

Related Items


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Vacuum Post Holder Packaging
Click to Enlarge

Vacuum-Compatible Ø1" Post System: POLARIS-K05, PLS-P150, and POLARIS-CA1

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" Post System Includes Posts, Clamping Arms, Post Holder Bases, Cap Screws, and 45° Mounting Adapter
  • 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
Vacuum Post Holder Packaging
Click to Enlarge

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

This page features vacuum-compatible versions of our most popular Ø1" 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. We also offer Ø1/2" vacuum-compatible optomechanical components.

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

Item Ø1" Posts Clamping Arms Post Holder Bases Vented Cap Screws and Washers 45° Mounting Adapters
Vacuum
Compatibility
as Packageda
>10-6 Torr
Materials 303 Stainless Steel Arm: 303 Stainless Steel
Screw: 316 Stainless Steel (Imperial),
A4 Stainless Steel (Metric)
6061-T6 Aluminum 316 Stainless Steel (Imperial)
A4 Stainless Steel (Metric)
303 Stainless Steel
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 1.8 x 10-8 Torr-Liters/s/cm2 7.6 x 10-9 Torr-Liters/s/cm2 1.8 x 10-8 Torr-Liters/s/cm2 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.

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Vacuum-Compatible Ø1" (Ø25 mm) Posts

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 303 Stainless Steel
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.

Click for Details

No adapter is required for attaching optic mounts to these posts.
Volume Pricing Discount

OEM Solutions and Volume Orders

Thorlabs manufactures custom and high-volume Polaris™ products for use in custom and OEM systems. For pricing information on high-volume orders of our standard posts, please contact Technical Support.

  • Vacuum Compatible to 10-9 Torr at 25 °C with Proper Bake Out
  • Top-Located 8-32 (M4) Tap and Bottom-Located 1/4"-20 (M6) Tap
  • Two Ø2 mm Alignment Pin Holes Around Each Tap for Precision Mounting (Dowel Pins Not Included)
  • 303 Stainless Steel Heat-Treated to Remove Internal Stresses for Increased System Stability
  • Large-Diameter Relief Cut on Top and Bottom for Mounting Stability
  • Custom Lengths, Taps, and Usage Features are Available by Contacting Tech Support

  These posts are constructed from 303 stainless steel and heat-treated to remove internal stresses. Imperial posts are 1" in diameter and metric posts are 25 mm in diameter.

Each of these posts contains a top-located 8-32 (M4) tap and a bottom-located 1/4”-20 (M6) tap. The 8-32 (M4) tap allows a mirror mount to be directly attached with a cap screw. Consequently, these posts provide a one-piece post solution, thereby removing all instabilities traditionally present when combining multiple optomechanical components (e.g., a thread adapter, height spacer, and post) to create a system at a specific optical axis height.

Created with OEM and custom systems in mind, two Ø2 mm alignment pin holes are located around each tap, which will allow for dowel pins to be used. Securing posts and accessories within a system using dowel pins, as shown in the photo to the left, prevents them coming loose due to vibrations, shipping, or incidental contact. To maintain vacuum compatibility, only vented screws and dowel pins should be used.

Alignment Bore
A Ø6 mm alignment bore is located 20 mm from the base and is drilled towards the vertical center line of the post. Strategically located so that it will not be covered when these posts are secured with a POLARIS-CA1 or POLARIS-CA25/M Clamping Arm (sold below), this bore can be used in combination with our cage rods for the alignment of multiple mounts along a common optical axis or for fine angle tuning.

Please note that this bore does not go completely through the PLS-P1 and PLS-P246/M posts; these posts contain two bores on opposite sides, within ±0.3°, that are 0.20" (5.1 mm) deep. 

Polaris™ Compatibility
These posts were designed specifically to pair with our other Polaris optomechanical components. Click here for more information on these posts, including OEM mounting options, mounting stability details, and test data. 

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PLS-P1 Support Documentation
PLS-P1Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.00"
$31.26
Today
PLS-P150 Support Documentation
PLS-P150Ø1" Post for Polaris Mirror Mounts, One 8-32 Tap, L = 1.50"
$32.31
Today
+1 Qty Docs Part Number - Metric Price Available
PLS-P246/M Support Documentation
PLS-P246/MØ25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 24.6 mm
$31.26
Today
PLS-P373/M Support Documentation
PLS-P373/MØ25 mm Post for Polaris Mirror Mounts, One M4 Tap, L = 37.3 mm
$32.31
Today

Vacuum-Compatible Non-Bridging Clamping Arm

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials Arm: 303 Stainless Steel
Screw: 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
Additional
Vacuum
Compatibility
Information
Grease Vapor Pressure:
10-13 Torr at 20 °C ,
10-5 Torr at 200 °C
  • 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.
POLARIS-CA1 Test Data
Click to Enlarge

Side-Located 1/4"-20 (M6) Screw Actuates Clamping Bore
  • Vacuum Compatible to 10-9 Torr at 25 °C with Proper Bake Out
  • 3-Point Contact Bore with Flexure Clamping Mechanism for Ø1" or Ø25 mm Post Mounting
  • Three Options Available:
    • POLARIS-CA1: Ø1" (Ø25.4 mm) Bore and 1/4"-20 Screw
    • POLARIS-CA1/M: Ø1" (Ø25.4 mm) Bore and M6 x 1.0 Screw
    • POLARIS-CA25/M: Ø25.0 mm (Ø0.98") Bore and M6 x 1.0 Screw
  • 0.60" (15.2 mm) Deep Mounting Bore for Height Adjustments and 360° Rotation
  • Heat-Treated, Stress-Relieved Stainless Steel Provides Large Clamping Force
  • Flippable Design Supports Left- and Right-Handed Orientations
    (See Image Below Right)

The Polaris Clamping Arm is the ideal solution for stably mounting any Ø1" or Ø25 mm post. Each clamping arm, which is constructed from heat-treated, stress-relieved stainless steel, provides extremely high holding forces with minimal torquing of the mounting screws.

The POLARIS-CA1 and POLARIS-CA1/M are designed to hold a Ø1" post, such as our fixed Polaris mount, while the POLARIS-CA25/M is designed to hold a Ø25 mm post or Ø1/2" post holder using a flexure clamping mechanism. The POLARIS-CA1 and POLARIS-CA1/M are not compatible with Ø25 mm posts; the bore diameter is too large and will not contact the post when clamping.

The side-located clamping mechanism, as shown in the photo to the above left, is actuated using a non-vented 1/4"-20 cap screw for the POLARIS-CA1 or a non-vented M6 x 1.0 cap screw for the POLARIS-CA1/M and POLARIS-CA25/M. Because the side-located clamp and mounting slot are tightened separately, the user can set the position of the fork and adjust the rotational alignment independently. The clamping arm has a compact 3.33" x 1.60" (84.5 mm x 40.6 mm) footprint for tight laser cavity setups, with a thickness of 0.60" (15.2 mm) for increased stability. A 1.30" (33.0 mm) long clearance slot allows for a variety of mounting solutions using a 1/4"-20 or M6 cap screw and washer. 

The flat, non-bridging (see drawing below) top and bottom allow the clamping arm to be used on either side depending on the needs of the application. This allows optical components to be placed in near contact to one another while minimizing the footprint, as shown in the image to the bottom right. A relief cut is included around the top and bottom slot; this protects the ±0.001" (±0.02 mm) flat surface that contacts the optical table from any marring due to the screw and washer. Minimizing damage to this surface of the fork allows for more stable mounting of components using the clamping arm.

Note: The POLARIS-CA1 requires a 3/16" hex key and the POLARIS-CA1/M and POLARIS-CA25/M requires a 5 mm hex key.

POLARIS-CA1 Test Data
Click to Enlarge

The Top and Bottom of the Fork can be Used for Mounting, Minimizing the Overall Footprint and Distance Between Components
Non-Bridging Design

Industry-standard clamping forks are designed with a bridge, as shown in the below diagram, for clamping to pedestal style posts or post holders. This design will slightly damage the laser platform during each use by pulling up the part of the platform located under the bridge. The Polaris clamping arm is designed with a flat top and bottom to eliminate this problem.

Industry Standard Clamping Fork Test Data
Click to Enlarge
A Bridge is Created When an Industry-Standard Clamping Fork is Used with a Pedestal Post
Polaris Clamping Arm Test Data
Click to Enlarge
The POLARIS-CA1 Eliminates the Bridge Created by an Industry-Standard Clamping Fork
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
POLARIS-CA1 Support Documentation
POLARIS-CA1Flexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, 1/4"-20 Clamping Screw
$80.08
Today
+1 Qty Docs Part Number - Metric Price Available
POLARIS-CA1/M Support Documentation
POLARIS-CA1/MFlexure Clamping Arm for Ø1" Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw
$80.08
Today
POLARIS-CA25/M Support Documentation
POLARIS-CA25/MFlexure Clamping Arm for Ø25 mm Posts, Non-Bridging, Stainless Steel, M6 Clamping Screw
$80.08
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
Today
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 45° Mounting Adapter for Ø1" or Ø25 mm Polaris Mirror Mounts

Vacuum Compatibility Specifications
Vacuum Compatibility
as Packageda
>10-6 Torr
Materials 303 Stainless Steel
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.

Click to Enlarge

POLARIS-MA45 Mounts Optics at a 45° Angle with Respect to the Working Surface
  • Vacuum Compatible to 10-9 Torr at 25 °C with Proper Bake Out
  • Designed for Use With All Ø1" or Ø25 mm Polaris Mirror Mounts
  • Bottom-Located 1/4"-20 (M6) Tap Allows for Attachment to Ø1" (Ø25.0 mm) Posts
  • Two Ø2 mm Alignment Pin Holes in the Base for Precision Mounting in OEM Systems
  • Heat-Treated 303 Stainless Steel

The POLARIS-MA45(/M) 45° Mounting Adapters securely mount Ø1" or Ø25 mm Polaris Mirror Mounts at a 45° angle with respect to the optical tablebreadboard, or working surface. The adapter has an 8-32 (M4) tap on the 45° face for securing the mirror mount, and a bottom-located 1/4"-20 (M6) tap for attachment to Ø1" (Ø25.0 mm) Posts. Two Ø2 mm (non-vented) alignment pin holes around each tap allow for direct, precision mounting within custom or OEM systems.

When using our standard Ø1"or Ø25 mm Polaris mounts, the height to the center of the mirror will be 2" from the base of the mounting adapter when using the POLARIS-MA45, or 50 mm if using the POLARIS-MA45/M. The optic center will also be aligned over the center axis of the mount. Please note that when using other Polaris mounts, such as our low-distortion or SM-threaded versions, these values will differ and the mirror center will not be perfectly centered over the center axis of the mount.

Cleanroom and Vacuum Compatibility
The POLARIS-MA45(/M) is designed to be compatible with cleanroom and vacuum applications. They are chemically cleaned using the Carpenter AAA passivation method to remove sulfur, iron, and contaminants from the surface. After passivation, they are assembled in a clean environment and double vacuum bagged to eliminate contamination when transported into a cleanroom. Please contact Tech Support for details.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
POLARIS-MA45 Support Documentation
POLARIS-MA45Customer Inspired! 45° Mounting Adapter for Ø1" and Ø25 mm Polaris Mounts, 8-32 and 1/4"-20 Taps
$44.39
Today
+1 Qty Docs Part Number - Metric Price Available
POLARIS-MA45/M Support Documentation
POLARIS-MA45/MCustomer Inspired! 45° Mounting Adapter for Ø1" and Ø25 mm Polaris Mounts, M4 and M6 Taps
$44.39
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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