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Ø1" Optical Post Accessories

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Ø1" (Ø25 mm) Post Clamp Accessories




  • Clamps for 16,30,and 60mm Cage Support
  • C-Clamps with Tapped or Through Holes
  • Clamps with Rotating Threaded Studs

C-Clamp Design

The RM series of Ø1" (Ø25 mm) post clamps feature a C-clamp design that allows them to be slipped on and off of a Ø1" (Ø25 mm) post. The clamp is secured using a non-marring brass tipped setscrew. The clamps come in a variety of styles, each with different mounting features, which are summarized in the table below.

Relief Cut Clamp Design

The C series of Ø1" (Ø25 mm) post clamps feature a precision bored Ø1" (Ø25 mm) hole with a relief cut. A clamping screw is used to squeeze the gap created by the relief cut, which in turn secures the clamp to the Ø1" (Ø25 mm) post with a great deal of force. The mounting features are summarized in the table below.

Imperial Metric
Item #StyleTapped Hole
for Mounting
Through Hole
for Mounting
Rotating, Threaded
Mounting Stud
Cage System
Clamp Size
RM1A C-Clamp 8-32 8-32    
RM1B C-Clamp 1/4"-20 1/4"-20    
RM1C C-Clamp     8-32  
RM1D C-Clamp with Variable Height Offset   #8    
C1026 Relief Cut Clamp       30 mm
C1060 Relief Cut Clamp       60 mm
RA90RS Right-Angle Flexure Clamp   Ø1/2"    
RM1A/M C-Clamp M4 M4    
RM1B/M C-Clamp M6 M6    
RM1C/M C-Clamp     M4  
RM1D/M C-Clamp with Variable Height Offset   M4    
C1026/M Relief Cut Clamp       30 mm
C1060/M Relief Cut Clamp       60 mm
RA90RS/M Right-Angle Flexure Clamp   Ø12.7 mm    

For alternative thread types, consider using a thread adapter or consider a solution based on Ø1.5", Ø1/2", or Ø6 mm posts.

Mounting Joists

Thorlab's Mounting Joists provide even more space-saving options. The compact joist can be used to mount multiple optical elements close together, which alleviates the need for multiple posts and posts holders. These versatile joists can also offset a post from the mounted optic in order to squeeze the optic into tight areas. The two joist designs provide adaptable laboratory solutions to crowded table problems.

 

C-Clamps for Ø1" Posts


*  RM1A: 8-32 Tapped Hole and #8 Counterbored Through Hole
*  RM1A/M: M4 Tapped Hole and M4 Counterbored Through Hole
*  RM1B: 1/4"-20 Tapped Hole and 1/4"-20 Through Hole
*  RM1B/M: M6 Tapped Hole and M6 Through Hole
*  RM1C: 8-32 Rotating Threaded Stud
*  RM1C/M: M4 Rotating Threaded Stud

RM1A (RM1A/M) and RM1B (RM1B/M) C-Clamps for Ø1" (Ø25 mm) posts each have two mounting points located 90° apart for perpendicular mounting of components. One of the mounting points has a tapped hole while the other has a counterbored through hole. Alternatively, the RM1C (RM1C/M) has one mounting point with a rotating threaded mounting stud. The C-clamp design allows the clamp to be slipped on and off the post easily. Simply loosen or tighten the brass tipped (non-marring) setscrew that locks the C-clamp to the Ø1" (Ø25 mm) post.

 

Ø1" to Ø1/2" Right-Angle Post Clamp

 

  • Mounts a Ø1/2" Post Perpendicular to a Ø1" Post
  • Flexure Mechanism Secures Right-Angle Clamp to Ø1" Post
  • Thumbscrew Secures Ø1/2" Post
  • Imperial and Metric Versions Available

The RA90RS clamp allows a Ø1/2" TR post to be mounted perpendicularly to a Ø1.0" RS post. The design, which is based off of the RA90 Right-Angle Post Clamp, combines a highly stable clamp flexure lock with a thumbscrew locking mechanism to provide a solution that enables a Ø1/2" post to be mounted perpendicular to a Ø1" post. The center-to-center distance between the Ø1.0" and Ø1/2" posts is 1" for the imperial version (25.0 mm for the metric version).

 

Variable Offset C-Clamps for Ø1" Posts

 

  • RM1D: #8 Counterbored Through Hole
  • RM1D/M: M4 Counterbored Through Hole

RM1D (RM1D/M) Variable Offset C-Clamps for Ø1" (Ø25 mm) posts have a mounting surface that can be varied in position over a range of 0.4" (10 mm) in addition to a fixed position tapped mounting hole on the backside of the clamp. The variable position mounting surface has either a tapped or counterbored through hole (model dependent) and it is locked in place using a thumbscrew. The C-clamp design allows the clamp to be slipped on and off the post easily. Simply loosen or tighten the brass tipped (non-marring) setscrew that locks the C-clamp to the Ø1" (Ø25 mm) post.

 

Ø1" (Ø25 mm) Post Cage Clamp Mount

 

  • Quick-Connect Cage Clamp
  • Easy Drop-In/Drop-Out of Cage Systems
  • Single Locking Screw Allows One-Handed Operation
  • Compatible with Ø1" (Ø25 mm) RS Series Posts

The C1026 (C1026/M) and C1060 (C1060/M) relief cut clamps for Ø1" (Ø25 mm) posts are designed to support 30 mm and 60 mm cage systems, respectively. Two parallel cage rods can be placed in the clamp and with a single screw they can be locked in place. In this way, complete sections of cage systems can be supported by a single post as can be seen in the application image at the top of the page. The clamp itself has a precision Ø1" hole bored through it with a relief cut. A 1/4"-20 (M6) caphead screw can be tightened to compress the gap created by the relief cut, which results in the C10 Series being secured to the Ø1" (Ø 25 mm) post with a great deal of force.

 

Mounting Joists

 

  • Compatible with Thorlabs' Ø1/2" and Ø1" Posts
  • Space-Saving Design Allows the Mounting of Multiple Optical Elements on One Post
  • Options for Center-Mounting or Offset-Mounting

Thorlabs’ Mounting Joists provide valuable space-saving mounting options, ideal for crowded optical tables or breadboards. These mounts are compatible with our Ø1/2” and Ø1” posts and allow multiple optics may be mounted close together on a single joist, eliminating the need for multiple posts and post holders.

The PJ301(/M) enables centered-mounting (optics may be placed on both sides of post center) and features a centered, counterbored hole for an 8-32 (M4) cap screw for post mounting and counterbored slots for an 8-32 (M4) cap screw and #8 nut (M4 nut). This joist allows an optic to be offset by 0.40" - 1.40" (10.16 - 35.56 mm) from post center.

The PJ302(/M) enables offset-mounting (optics may be offset to one side only) and features counterbored slots for an 8-32 (M4) cap screw for post mounting and a counterbored slot for an 8-32 (M4) cap screw and #8 nut (M4 nut). This joist allows an optic to be offset by 0.40" - 2.70" (10.16 - 68.58 mm) from post center.

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