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Post Bases


  • Rigid One-Piece Construction for Superior Stability
  • Convert Our Ø1" and Ø1.5" Posts into "Pedestal Style" Mounts

BE1/M

Adapter with M6 
Stud for Ø25.0 mm Posts

CF125

Shown with
PH2 Post Holder

Application Idea

Ideal for Ø1.5" Posts

PB1

1/4" (M6) Counterbores
(4 Top, 1 Bottom)

PB2

1/4" (M6) Counterbored Slots
1/4"-20 Center Tap
(M6 Center Tap in PB2/M)

PB4

Adapter with 1/4"-20
Stud for Ø1.5" Posts

PF175

Shown with P2 Post

Related Items


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1" and 1.5" Bases and Clamps
Click to Enlarge

Ø1" and Ø1.5" Posts can be Secured to an Optical Table Using Post Base Adapters and Clamping Forks

Features

  • Convert Ø1" Post Extensions and Ø1.5" Posts into Pedestal-Style Posts
  • All Bases Provide Large Bottom Relief Cuts for Exceptional Stability
  • Clamping Forks Offer Exceptional Positional Mounting Flexibility

Ø1" Post Bases
The BE1(/M) and BE1R(/M) fasten directly to a Ø1" post extension or a Ø1/2" post holder via the provided 1/4"-20 (M6) stud, converting a standard post or post holder into a pedestal-style mount. For additional stability in temporary setups, the BE1R(/M) base provides a high-strength magnet in the base. Ø1" pedestal configurations are directly compatible with our CF038-P5, CF038C(/M)-P5, CF125, CF125C(/M), CF175, and CF175C(/M) solid stainless steel clamping forks, which provide for the greatest overall positional flexibility when mounting to an optical table.

Ø1.5" Post Bases
The PB1 and PB2(/M) fasten directly to a Ø1.5" post via 1/4"-20 (M6) cap screws placed through the bottom-located counterbores in the base. The PB1 offers four top-located 1/4" (M6) counterbores located on 1" centers for compatibility with both imperial and metric optical tables and breadboards. The PB2 provides four 1/4" (M6) counterbored slots for additional positional freedom where alignment on an optical table does not conform to standard table mounting hole spacing.

The PB4 provides even greater positional flexibility by fastening directly to a Ø1.5" post via the provided 1/4"-20 (M6) stud, converting a standard post into a pedestal-style post. This pedestal configuration is directly compatible with the PF175 clamping fork which provides high positional flexibility when mounting to an optical table.


Posted Comments:
ludoangot  (posted 2016-11-11 16:01:40.59)
Hello, I have a suggestion: a counterbored version of your magnetic pedestal base (BE1R) so that it could be used for both M6 and 1/4"-20 by the user providing the appropriate screw.
tfrisch  (posted 2016-11-14 09:06:59.0)
Hello, thank you for this suggestion. I have posted it in our internal engineering forum.
Thorlabs  (posted 2010-09-08 21:33:45.0)
Response from Javier at Thorlabs to last poster: Thank you very much for pointing this typo out. The correct threads are 1/4"-20 (M6). We have corrected the information on the webpage.
user  (posted 2010-09-08 14:10:00.0)
[misprint?] Overview>Ø1" Post Bases The BE1 fastens directly to a Ø1" RS-Series Post via the provided ?#8-32 (M4)? stud, ====> M4? or M6?

Base Adapters and Clamping Forks for Ø1/2" Post Holders and Ø1" Posts


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
A CF125 fork is used to secure a Ø1/2" post holder to an optical table with a BE1 base.

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" Posts 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 Clamping 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) and BE1R(/M) pedestal base adapters feature a 1/4"-20 (M6)-threaded stud that fit into the bottom of our standard Ø1/2" post holders or Ø1" posts to convert them into pedestal-style mounts for added stability. The BE1R(/M) adapter features 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 standard Ø1" posts 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" posts that have been adapted using the BE1(/M) or BE1R(/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) or BE1R(/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 offer 0.38" (9.5 mm) long counterbored slots, the CF125 and CF125C(/M) forks offer 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 / Ships
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 / Ships
CF038-P5 Support Documentation
CF038-P5Customer Inspired! Clamping Fork, 0.38" Counterbored Slot, Universal, 5 Pack
$39.02
Today
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
3-5 Days
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 / Ships
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
3-5 Days
CF175C/M-P5 Support Documentation
CF175C/M-P5Clamping Fork, 44.8 mm Counterbored Slot, M6 x 1.0 Captive Screw, 5 Pack
$57.57
Today

Ø1.5" Post Bases

PB1
This universal post base has a 1/4" (M6) counterbored hole in the center that allows the base to be attached to a Ø1.5" mounting post using a 1/4"-20 (M6) cap screw. Four 1/4" (M6) counterbored holes are provided at the proper spacing for compatibility with an imperial or metric optical table or optical breadboard that contains mounting holes on 1" or 25 mm centers.

PB2 and PB2/M
These post bases have counterbored slots that allow for additional freedom in the placement of Ø1.5" mounting posts. The PB2 has a center-tapped 1/4"-20 hole while the PB2/M has a center-tapped M6 hole. The PB2/M has an identifying ring engraved around the tapped hole on the bottom face of the base. Use a 1/4"-20 (M6) setscrew to attach the PB2 (PB2/M) base to a Ø1.5" mounting post.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PB2 Support Documentation
PB2Mounting Post Base, Ø2.40" x 0.50" Thick
$28.05
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
PB1 Support Documentation
PB1Mounting Post Base, Ø2.48" x 0.40" Thick
$24.68
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PB2/M Support Documentation
PB2/MMetric Mounting Post Base, Ø61 mm x 12.7 mm Thick
$28.05
Today

Base Adapters and Clamping Fork for Ø1" Post Holders and Ø1.5" Posts

Clamping Fork with Pedestal Post
Click to Enlarge

The PF175 fork is used to secure a Ø1.5" post to an optical table with a PB4 base.
P2 Clamping Fork with PB4
A Ø1.5" post is converted to a pedestal-style post with a PB4 base adapter.
  • PB4(/M) Adapter Converts Ø1.5" Posts to Pedestal-Style Mounts
  • Clamping Fork Secures Pedestal-Style Mount to a Breadboard or Optical Table
  • One Fork Size: 2.11" (53.6 mm) Long Counterbored Slot
  • Swivel Fork 360° to Select Most Convenient Mounting Hole

Pedestal Base Adapter
The PB4(/M) pedestal base adapter features a 1/4"-20 (M6)-threaded stud, which fits into the bottom of our Ø1.5" posts to convert them into pedestal-style mounts. Made from solid 303 stainless steel with a 1.85" (47.0 mm) outer diameter, this adapter allows these posts to be used with our PF175 clamping fork.

Clamping Fork
The PF175 clamping fork is designed to provide exceptional clamping force when used with our Ø1.5" posts that have been adapted using the PB4(/M) to pedestal-style mounts. This clamping fork can also be used with our Ø1" post holders or BLP01 adjustable-height post without any need for the PB4(/M).

Made from anodized aluminum, the PF175 clamping fork creates three points of contact with the table for high stability. The 2.11" (54 mm) long counterbored slot for 1/4"-20 (M6) cap screws allows the most convenient mounting hole to be selected and creates flexibility in the positioning of post assemblies. Please note that significant overtightening of clamping forks can deform the surface of an optical table, which can cause misalignment of components and decrease stability.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
PB4 Support Documentation
PB4Studded Pedestal Base Adapter, 1/4"-20 Thread
$12.95
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
PF175 Support Documentation
PF175Clamping Fork for Ø1.5" Pedestal Post or Post Pedestal Base Adapter, Universal
$18.26
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
PB4/M Support Documentation
PB4/MStudded Pedestal Base Adapter, M6 x 1.0 Thread
$12.95
Today

Ø1" Pillar Post Mount

RB2 Mounting a Ø1
Click to Enlarge
Deep Base Allows Height Adjustment
  • RB2 Base Allows Post Extensions to be Used as a Variable Height Mounting Structure
  • Hollow Base Allows Post Extension to Pass Through for 0.5" of Height Adjustability
  • Convenient Vertically Accessed Locking Screw

The RB2(/M) pillar post base mounts Ø1" (25 mm) optical posts at a variable height (shown to the right). The hollow base allows the post to pass through, allowing 0.5" of post height adjustment. Translation is locked via a top-located clamping screw.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
RB2 Support Documentation
RB2Adjustable Height Post Base for Ø1" RS Series Post Extensions
$32.39
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
RB2/M Support Documentation
RB2/MAdjustable Height Post Base for Ø25 mm RS Series Post Extensions
$32.39
Today

Post Position Retainers

  • Mark the Position of Ø1" and Ø1.5" Posts within an Optical System
  • Realignment Based on Two Contact Points
  • Third Contact Point for Realigning Square Components
  • Swivel Head Retainer Available with 200° of Rotation

Thorlabs' Position Retainers can be used to realign posts that have been removed from an optical system. They act as markers on the breadboard or optical table in the event that you need to remove a post from your setup. The two dots near the ends of the outer arms of the retainer mark the two points of post contact. The third dot, located within the V-groove, is for retaining the position of a square base or other squared-off component. For more information on using our retainers with square components, click here.

The RSPC Fixed Retainer is a compact solution for use with Ø1" and Ø1.5" Pedestal Posts. The post should be independently clamped down before aligning the RSPC retainer. After the retainer is mounted in place, the post can be removed from the setup and then later placed back into the same position.

The RSPCS(/M) Swivel Retainer features a swivel head for 200° of rotational adjustment. This allows for access to additional mounting holes on the breadboard. The post should be independently locked before aligning RSPCS(/M) retainer. Partially loosen the tension adjuster screw and then mount the retainer to a breadboard tap while maintaining contact with the post. Lastly, tighten the tension adjuster screw. After this the component can be removed from the setup and then later placed back into the same position.

RSPC Mounted Directly to Optical Table
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
RSPC1Fixed Position Retainer
RS21Ø1" Pillar Post, 1/4"-20 Taps, L = 2", 8-32 Adapter Included
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE11Ø1.25" Studded Pedestal Base Adapter, 1/4"-20 Thread
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
RSPC1Fixed Position Retainer
RS50/M1Ø25.0 mm Pillar Post, M6 Taps, L = 50 mm, M4 Adapter Included
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
BE1/M1Ø31.8 mm Studded Pedestal Base Adapter, M6 Thread
SH6MS121M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
RSPC Position Retainer

Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
RSPCS1Position Retainer with Swivel Head, 3/16" Hex Tension Adjuster
RS2P8E1Ø1" Pedestal Pillar Post, 8-32 Taps, L = 2"
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
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
RSPCS/M1Position Retainer with Swivel Head, 5 mm Hex Tension Adjuster
RS3P4M1Ø25.0 mm Pedestal Pillar Post, M4 Taps, L = 75 mm
CF1251Clamping Fork, 1.24" Counterbored Slot, Universal
SH6MS121M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
RSPCS Swiveling Position Retainer
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
RSPCS Support Documentation
RSPCSPosition Retainer with Swivel Head, 3/16" Hex Tension Adjuster
$31.67
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
RSPC Support Documentation
RSPCCustomer Inspired! Fixed Position Retainer
$9.38
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
RSPCS/M Support Documentation
RSPCS/MPosition Retainer with Swivel Head, 5 mm Hex Tension Adjuster
$31.67
Today
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