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Ø1" (Ø25.0 mm) Post Clamp Accessories


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

RA90RS

Mounts Ø1" to Ø1/2" Posts
(Posts Sold Separately)

1/4"-20
(M6) Tap

1/4" (M6)
Counterbore

RM1B

C1026

For 30 mm
Cage Systems

C1010

Mounting Clamp

PJ301 Mounting Joist Holds Retroreflecting Mirrors (All Parts Sold Separately)

Application Idea

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Slip-On Clamps
Thorlabs' Ø1" (Ø25.0 mm) slip-on clamps feature a C-clamp design that allows them to be slipped on and off of a Ø1" (Ø25.0 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; see below for details.

Compact Mounting Clamp
Our C1010(/M) Mounting Clamp allows optic mounts with 8-32 (M4) tapped holes to be attached to a Ø1" (Ø25.0 mm) post. It features a flexure clamping design with a quick-release handle. For mounting larger systems or multiple components onto a Ø1" or Ø25 mm post, we also offer vertical mounting clamps and horizontal mounting brackets.

Right-Angle Mounts
These right-angle mounts allow a Ø1" (Ø25.0 mm) post to be mounted at a right angle to another Ø1" (Ø25.0 mm) post or to a Ø1/2" post. They each feature a flexure clamping design for the Ø1" (Ø25.0 mm) post clamps.

Cage System Clamps
Our cage system clamps are designed to support 30 mm and 60 mm cage systems and feature a quick-connect cage clamp with single-screw locking. They clamp onto our Ø1" (Ø25.0 mm) posts using a flexure mechanism.

Mounting Joists
Thorlabs' compact mounting joists can be used to mount multiple optical elements close together, alleviating 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.


Posted Comments:
Beate Knauer  (posted 2021-03-15 17:19:39.717)
It would be nice, if it would exist *fully* metric; i.e. including a metric 12 mm post clamp (instead of the 1/2"). If it already exist and I just cannot find, I'd highly appreciate a link.
YLohia  (posted 2021-03-16 12:11:42.0)
Hello, thank you for your feedback. We currently don't offer these, but we will consider adding such items to our catalog in the future.
user  (posted 2020-06-01 19:44:57.203)
For very limited space applications, it would be nice to have the same as the RSA90 and RSA90/M, but in 1/2" (so same as RA90 and RA90/M, but without the screws taking some space at the end).
YLohia  (posted 2020-06-02 10:50:36.0)
Thank you for your feedback. The RA90[/M] features 1/4"-20 [M6] taps with ~33 mm thread depth. You may use the SS25S10 [or SS6MS25] or any other 1/4"-20 [M6] tapped setscrew of the appropriate length to lock the post instead of the included thumbscrew for space-constrained applications.
jeff  (posted 2018-12-26 15:41:08.45)
Wondering if there is a way to just get the clamp part of the cage clamp assembly.
llamb  (posted 2018-12-27 09:00:52.0)
Please email techsupport@thorlabs.com for quote requests on any custom or component items. I have reached out to you by email to discuss.
user  (posted 2018-06-19 13:31:00.917)
It would be very nice to have a 0-degree version of this product, to place a 1/2" post parallel to a 1" post.
YLohia  (posted 2018-06-19 09:57:48.0)
Hello, thank you for your feedback. I have posted this idea on our internal engineering forum.
sgeiger  (posted 2016-10-25 10:42:58.223)
Hello, in the step data there is an mistake. The "CLEARANCE HOLE FOR USE WITH M4 [8-32]CAP SCREW" is from the oposite side. (see also PDF data - that's right) Can I get an correct step-file? Best regards
tfrisch  (posted 2016-10-26 10:37:23.0)
Hello, thank you for contacting Thorlabs. I have sent you a corrected STEP file, and we are working on updating the webpage as well. Thank you for pointing out this error.

Slip-On Clamps for Ø1" (Ø25.0 mm) Posts

Item # Mounting Features
Tapped
Hole
Counterbored
Hole
Mounting
Stud
Clamping
Feature
RM1A(/M) 8-32 (M4) #8 (M4) - Setscrew w/
5/64" (2.0 mm) Hex
RM1B(/M) 1/4"-20 (M6) 1/4" (M6) -
RM1C(/M) 8-32 (M4) - 8-32 (M4)

The RM1A(/M), RM1B(/M), and RM1C(/M) Slip-On Clamps for Ø1" (Ø25.0 mm) posts each have two mounting points located 90° apart for perpendicular mounting of optomechanical components. On the RM1A(/M) and RM1B(/M), one of the mounting points has a tapped hole and the other has a counterbored hole. Alternatively, the RM1C(/M) has one mounting point with a mounting stud and another with a tapped hole. The threaded stud can be rotated using a thumb wheel which also features Ø3.1 mm holes that provide extra torque for mounting or removing components.

The C-clamp design allows these clamps to slide along a post to the desired position, where they can be locked by tightening the brass-tipped (non-marring) setscrew with a 5/64" (2.0 mm) hex key or balldriver.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RM1A Support Documentation
RM1AØ1" Slip-On Post Clamp, 8-32 Tap, #8 Counterbore
$28.41
Today
RM1B Support Documentation
RM1BØ1" Slip-On Post Clamp, 1/4"-20 Tap, 1/4" Counterbore
$28.41
Today
RM1C Support Documentation
RM1CØ1" Slip-On Post Clamp, 8-32 Tap, 8-32 Threaded Stud
$53.56
5-8 Days
+1 Qty Docs Part Number - Metric Price Available
RM1A/M Support Documentation
RM1A/MØ25.0 mm Slip-On Post Clamp, M4 Tap, M4 Counterbore
$28.41
Today
RM1B/M Support Documentation
RM1B/MØ25.0 mm Slip-On Post Clamp, M6 Tap, M6 Counterbore
$28.41
Today
RM1C/M Support Documentation
RM1C/MØ25.0 mm Slip-On Post Clamp, M4 Tap, M4 Threaded Stud
$53.56
Today

Variable Offset Slip-On Clamp for Ø1" (Ø25.0 mm) Posts

RM1D Application
Click to Enlarge
Two Ø1" Posts Mounted Orthogonally Using the RM1D Clamp
RM1D Mechanical Drawing
Click to Enlarge

Mechanical Drawing

The RM1D(/M) Adjustable Clamp for Ø1" (Ø25.0 mm) posts allows users to mount a Ø1" post orthogonally over another Ø1" post without introducing a lateral offset. The slip-on clamp holds the orthogonal post with a brass-tipped (non-marring) setscrew that is actuated using a 5/64" (2.0 mm) hex key or balldriver. Once secured, the assembly can slide along a post, granting height variation of of 0.4" (10 mm). The chosen height can be locked in by tightening the 3/16" (5 mm) hex thumbscrew at the side of the mount. The clamp has a #8 counterbore at the base, allowing it to be mounted to many of our posts. There is also an 8-32 tap at the top of the part for inverted mounting.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RM1D Support Documentation
RM1DØ1" Adjustable Post Clamp, 8-32 Tap, #8 Counterbore
$56.81
Today
+1 Qty Docs Part Number - Metric Price Available
RM1D/M Support Documentation
RM1D/MØ25.0 mm Adjustable Post Clamp, M4 Tap, M4 Counterbore
$56.81
Lead Time

Compact Mounting Clamp for Ø1" (Ø25.0 mm) Posts

Item # Mounting Feature
Mounting Stud Clamping Feature
C1010(/M) 8-32 (M4) C10QR(/M) Handlea
  • Replacement handles are available below.

The C1010(/M) Mounting Clamp allows an optic mount with a 8-32 (M4) tapped hole to be attached to a Ø1" (Ø25.0 mm) post. The mounting stud can be rotated using a thumb wheel which also features Ø3.1 mm holes that provide extra torque for mounting or removing components. A brass-tipped setscrew (5/64" [2.0 mm] hex) at the top of the clamp locks the rotation of the thumb wheel.

Each post clamp includes a C10QR(/M) Quick-Release Handle for mounting to the post; replacement quick-release handles can be purchased separately below. For space constrained applications, the handle can be removed and replaced with a 1/4"-20 (M6) cap screw at least 1/2" (12 mm) long.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
C1010 Support Documentation
C1010NEW!Compact Ø1" Post Mounting Clamp, 8-32 Threaded Stud, Included Quick-Release Handle
$100.00
Today
+1 Qty Docs Part Number - Metric Price Available
C1010/M Support Documentation
C1010/MNEW!Ø25.0 mm Post Clamp, M4 Threaded Stud, Included Quick-Release Handle
$100.00
Today

Right-Angle Clamp for Ø1" (Ø25.0 mm) Posts

RSA90 Clamp
Click to Enlarge
Two Ø1" Posts Mounted Orthogonally Using the RSA90 Clamp
  • Mounts Two Ø1" (Ø25.0 mm) Posts Perpendicular to Each Other
  • Flexure Clamping Mechanism Secures Right-Angle Clamp to Ø1" (Ø25.0 mm) Posts
  • 1/4"-20 (M6) Cap Screws Secure the Posts
  • Imperial and Metric Versions Available

Thorlabs' RSA90(/M) Right-Angle Clamp allows one Ø1" (25.0 mm) post to be mounted perpendicularly to another Ø1" (25.0 mm) post. The clamp features a highly stable flexure lock design that is secured using a 3/16" (5 mm) balldriver. The center-to-center distance between the two posts is 1.25" for the imperial version and 30.0 mm for the metric version.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RSA90 Support Documentation
RSA90Right-Angle Clamp for Ø1" Posts
$33.28
Today
+1 Qty Docs Part Number - Metric Price Available
RSA90/M Support Documentation
RSA90/MRight-Angle Clamp for Ø25.0 mm Posts
$33.28
Today

Right-Angle Ø1" (Ø25.0 mm) to Ø1/2" Post Clamp

RA90RS Clamp
Click to Enlarge
A Ø1/2" Post Mounted Perpendicularly to a Ø1" Post Using the RA90RS Clamp
  • Mounts a Ø1/2" Post Perpendicular to a Ø1" (Ø25.0 mm) Post
  • Flexure Mechanism Secures Right-Angle Clamp to Ø1" (Ø25.0 mm) Post
  • Thumbscrew Secures Ø1/2" Post
  • Imperial and Metric Versions Available

The RA90RS(/M) clamp allows a Ø1/2" post to be mounted perpendicularly to a Ø1" (25.0 mm) post. The design, which is based off of the RA90 Right-Angle Post Clamp, combines a highly stable clamp flexure lock that is secured using a 3/16" (5 mm) balldriver with a thumbscrew locking mechanism. The thumbscrew can be tightened with a torque of up to 50 in-lbs (5.65 N·m). The center-to-center distance between the two posts is 1" for the imperial version and 25.0 mm for the metric version.

The C15QR(/M) handle can replace the 1/4"-20 (M6) clamping screw for better control when adjusting the clamps. Note that the C10QR(/M) handle is not compatible with these clamps.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
RA90RS Support Documentation
RA90RSRight-Angle Ø1" to Ø1/2" Post Clamp
$28.41
Today
+1 Qty Docs Part Number - Metric Price Available
RA90RS/M Support Documentation
RA90RS/MRight-Angle Ø25.0 mm to Ø1/2" Post Clamp
$28.41
Today

Cage System Clamps for Ø1" (Ø25.0 mm) Posts


Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
C1060160 mm Cage Clamp for Ø1" Posts
RS61Ø1" Pillar Post, 1/4"-20 Taps, L = 6"
ER6-P41Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
LCP01260 mm Cage Plate, SM2 Threads, 0.5" Thick, 8-32 Tap (Two SM2RR Retaining Rings Included)
View Metric Product List
Item #QtyDescription
Metric Product List
C1060/M160 mm Cage Clamp for Ø25.0 mm Posts
RS150/M1Ø25.0 mm Pillar Post, M6 Taps, L = 150 mm
ER6-P41Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
LCP01/M260 mm Cage Plate, SM2 Threads, 0.5" Thick, M4 Tap (Two SM2RR Retaining Rings Included)
60 mm Cage System Mounted on a Ø1" Post Using a C1060 Clamp

Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
C15QR1Quick-Release Handle, 2.03" Long, 1/4"-20 Threads
C1026130 mm Cage Clamp for Ø1" Posts
RS61Ø1" Pillar Post, 1/4"-20 Taps, L = 6"
View Metric Product List
Item #QtyDescription
Metric Product List
C15QR/M1Quick Release Handle, 51.4 mm Long, M6 x 1.0 Threads
C1026/M130 mm Cage Clamp for Ø25.0 mm Posts
RS150/M1Ø25.0 mm Pillar Post, M6 Taps, L = 150 mm
A C15QR(/M) Quick-Release Handle can be used in place of the 1/4"-20 (M6) clamping screw for better control.
  • Quick-Connect Cage Clamps for 30 mm and 60 mm Cage Systems
  • Easy Drop-In and Drop-Out of Cage Systems
  • Single Locking Screw Allows One-Handed Operation
  • Compatible with Ø1" (Ø25 mm) Posts

The C1026(/M) and C1060(/M) Cage System 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 locked in place with a single screw. In this way, complete cage system sections can be supported by a single post. The clamp itself can be secured to a Ø1" (Ø25 mm) post by tightening the highly stable flexure lock mechanism with a 3/16" (5 mm) balldriver.

The C15QR(/M) handle can replace the 1/4"-20 (M6) clamping screw for better control when adjusting the clamps, as shown in the image to the right. Note that the C10QR(/M) handle is not compatible with these clamps.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
C1026 Support Documentation
C102630 mm Cage Clamp for Ø1" Posts
$80.07
Today
C1060 Support Documentation
C106060 mm Cage Clamp for Ø1" Posts
$89.01
Today
+1 Qty Docs Part Number - Metric Price Available
C1026/M Support Documentation
C1026/M30 mm Cage Clamp for Ø25.0 mm Posts
$80.07
Today
C1060/M Support Documentation
C1060/M60 mm Cage Clamp for Ø25.0 mm Posts
$89.01
Today

Mounting Joists

PJ302(/M)
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
PJ3021Offset Mounting Post Joist, 8-32 Mounting Hardware
RS41Ø1" Pillar Post, 1/4"-20 Taps, L = 4"
KM1001Kinematic Mirror Mount for Ø1" Optics
View Metric Product List
Item #QtyDescription
Metric Product List
PJ302/M1Offset Mounting Post Joist, M4 Mounting Hardware
RS100/M1Ø25.0 mm Pillar Post, M6 Taps, L = 100 mm
KM1001Kinematic Mirror Mount for Ø1" Optics
PJ302 Post Joint Mounting a Mirror in a Position Offset from the Center of a Ø1" Post
PJ301(/M)
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
PJ3011Centered Mounting Post Joist, 8-32 Mounting Hardware
LMR12Lens Mount with Retaining Ring for Ø1" Optics, 8-32 Tap
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
Metric Product List
PJ301/M1Centered Mounting Post Joist, M4 Mounting Hardware
LMR1/M2Lens Mount with Retaining Ring for Ø1" Optics, M4 Tap
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
PJ301 Post Joist Mounting Two Lenses About the Center of a Ø1/2" Post
  • Compatible with Thorlabs' Ø1/2" and Ø1" Posts
  • Space-Saving Design Allows for Multiple Optical Elements to be Mounted on One Post
  • Options for Center Mounting or Offset Mounting

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

The PJ301(/M) enables centered mounting in which optics can be placed on both sides of the post center. It features a centered #8 (M4) counterbore for post mounting and two #8 (M4) counterbored slots for mounting optomechanical components. This joist allows an optic to be offset by 0.40" - 1.40" (10.16 mm - 35.56 mm) from the post center.

The PJ302(/M) enables offset mounting in which optics can be mounted to one side of the post center. It features two #8 (M4) counterbored slots with opposite orientations, one for post mounting and one for mounting optomechanical components. This joist allows an optic to be offset by 0.40" - 2.70" (10.16 mm - 68.58 mm) from the post center.

Please note that imperial nuts only fit the imperial joists and metric nuts only fit the metric joists. Nuts are included with the these joists.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PJ301 Support Documentation
PJ301Centered Mounting Post Joist, 8-32 Mounting Hardware
$18.29
Today
PJ302 Support Documentation
PJ302Offset Mounting Post Joist, 8-32 Mounting Hardware
$17.21
Today
+1 Qty Docs Part Number - Metric Price Available
PJ301/M Support Documentation
PJ301/MCentered Mounting Post Joist, M4 Mounting Hardware
$18.29
Today
PJ302/M Support Documentation
PJ302/MOffset Mounting Post Joist, M4 Mounting Hardware
$17.21
Today

Quick Release Handles

Handle
Item #
Handle
Length
Compatible Ø1" (Ø25.0 mm) Post Clamps
Item # Description
C10QR(/M) 1.44"
(36.5 mm)
C1010(/M) Mounting Clamps
C1011(/M)
C1045(/M)
Vertical Mounting Plates
C1012(/M) V-Clamp Mounts
C1015(/M)
C1019(/M)
Horizontal Mounting Platforms
C15QR(/M) 2.03"
(51.4 mm)
C1026(/M)
C1060(/M)
Cage System Clamps
RA90RS(/M) Right-Angle Ø1/2" Post Clamp
  • Quick-Release Handles Allow Post Clamps to be Easily Repositioned
  • Two Sizes Available:
    • 1.44" (36.5 mm) Long
    • 2.03" (51.4 mm) Long
  • Provides More Control and Feel when Locking and Unlocking a Clamp
  • Handles can be Rotated Without Actuating the Locking Screw
  • 1/4"-20 (M6 x 1.0) Threads

These quick-release handles provide a simple and reliable way of securing a flexure-based post clamp. In many cases a cap screw is used to lock a flexure-based clamp in place on a post, which requires a balldriver for adjustments. Depending on the mounted load, using a balldriver can be difficult, or even unsafe. These quick-release handles mitigate this problem by allowing the clamp to be hand-tightened, ensuring better control over the amount of torque applied to tighten or loosen the clamp. This also decreases the amount of time needed for basic setup and alignment by eliminating the need for additional balldrivers and allowing for a quick way to secure a clamp.

A list of Ø1" (Ø25.0 mm) Post Clamps that are compatible with these handles can be found in the table above. Visit the full quick-release handle presentation for additional compatibility information.

Easily installed by replacing the 1/4"-20 (M6) locking screw in a post clamp, each handle contains a 1/4"-20 (M6 x 1.0) threaded stud that engages a part by rotating the handle. Once the handle is tightened to secure a clamp to a post, the internal ratchet-type mechanism allows for the handle's rotational position to be adjusted without actuating the mounting stud. Simply pull the handle outwards to disengage it from the mounting stud, as shown in the image to the right, then rotate it to a more convenient position. This feature ensures that the handle will always be accessible to the user.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
C10QR Support Documentation
C10QRCustomer Inspired! Quick-Release Handle, 1.44" Long, 1/4"-20 Threads
$9.00
Today
C15QR Support Documentation
C15QRQuick-Release Handle, 2.03" Long, 1/4"-20 Threads
$10.50
Today
+1 Qty Docs Part Number - Metric Price Available
C10QR/M Support Documentation
C10QR/MCustomer Inspired! Quick Release Handle, 36.5 mm Long, M6 x 1.0 Threads
$9.00
Today
C15QR/M Support Documentation
C15QR/MQuick Release Handle, 51.4 mm Long, M6 x 1.0 Threads
$10.50
Today
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