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Articulated Ball and Socket Mounts

  • 50° Adjustment Cone with Three 90° Positions
  • 8-32 (M4) or 1/4"-20 (M6) Versions
  • Fully Lockable


90° Position

Locking Screw

Mounting Hole


8-32 (M4) Mounting

Application Idea

TRB1 Mounted Directly
to a Ø1/2" Post


1/4"-20 (M6) Mounting

Lockable, Adjustable Position

Related Items

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Item # TRB1 TRB1/M TRB2 TRB2/M
Setscrew and Mounting Hole 8-32 M4 1/4"-20 M6
Setscrew Hex 5/64" 2.0 mm 1/8" 3.0 mm
Max Torquea 5.0 lb-in
(0.56 N•m)
8.6 lb-in
(1.0 N•m)
Locking Screw Hexb 5/64" 2.0 mm 1/8"
Mounting Surface Diameter 0.35" (8.9 mm) 0.44" (11.2 mm)
  • Max torque from mounted component with all three locking screws engaged.
  • Hex key included.


  • Adjustable Throughout a 50° Cone
  • Three 90° Adjustment Positions
  • 8-32 (M4) and 1/4"-20 (M6) Threaded Versions
  • Three Setscrews for Locking and Tension Adjustment

These mounts feature a ball and socket mechanism that allows the mounting surface to be positioned anywhere within a 50° cone. Three cutouts in the base allow the mounting surface to be positioned at a 90° angle with respect to the mount's base. The TRB1(/M) ball and socket mount features a Ø0.35" (8.9 mm) mounting surface with an 8-32 (M4) threaded stud. The TRB2(/M) ball and socket mount features a Ø0.44" (11.2 mm) mounting surface with a 1/4"-20 (M6) threaded stud. The position of the mounting surface can be locked in place using any of the three locking screws, which also function as tension adjusters. The maximum torque from the mounted component is specified for when all three locking screws are hand tight. The bottom of each base features a hole with the same tap as the threaded stud, making these mounts ideal for use with our optical posts and general optomechanics.

Posted Comments:
tmorgus  (posted 2016-06-10 13:58:55.72)
The production of a 1/4-20 version is currently scheduled. I estimate that it will be available online in 4 weeks. If you need one sooner please let tech support know and I'll do what I can to expedite the availability. Sincerely, Tyler - Mechanics Business Unit Leader
user  (posted 2016-06-10 13:36:10.213)
A 1/4-20 version would fit most camera, and would be more useful for me.
tmorgus  (posted 2015-09-14 07:56:33.15)
Thank you for bringing Paul's comments back to the forefront. Having a 1/4-20 version would be useful. The Mechanics group has a small backlog of projects right now so it might take a little while to get this project to the top of the list. Sincerely Tyler, Thorlabs Mechanics Business Unit
user  (posted 2015-09-14 16:01:30.453)
I second Paul's comments (2013-10-07) suggesting a 1/4-20 version (end and top threads): it would allow also to mount end to end 1" posts without the need for extra adapters, and directly mount any 1/4-20 platform or optomechanical element.
paul  (posted 2013-10-07 15:48:17.177)
I thought the TRB1 would be useful to hold an IR viewer, with a BE1 to hold it to the table; alas the TRB1 is only available with male/female 8-32 threads at both ends and I'd need 1/4-20 at both ends.
cdaly  (posted 2013-10-10 16:06:00.0)
Response from Chris at Thorlabs: Thank you for your feedback. We do not have a 1/4-20 version at this time, but it should still be possible to sue the TRB1 with a few thread adapters. You could use an AE8E25E adapter on the top end to give you the external 1/4-20 thread and an AS25E8E adapter on the bottom to allow you to connect to the BE1. Both can be found here:
user  (posted 2011-11-27 18:54:59.0)
A response from Tyler at Thorlabs: The three locking screws are number 8-32 screws with a cone tip. The screw is three sixteenths of an inch long. We will contact you with a custom quote information.
dieter.reinhardt  (posted 2011-11-25 05:15:40.0)
Metric swivel base TRB1/M: is it possible to use 1 (or 3?) thumb screws in place of the 3 locking screws? If yes, please send part number.
jsteinbrook  (posted 2008-04-23 16:23:49.0)
Photos are fine, leave them alone
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
TRB1 Support Documentation
TRB1Locking Ball and Socket Mount, 8-32 Threaded
TRB2 Support Documentation
TRB2Customer Inspired! Locking Ball and Socket Mount, 1/4"-20 Threaded
+1 Qty Docs Part Number - Metric Price Available
TRB1/M Support Documentation
TRB1/MLocking Ball and Socket Mount, M4 Threaded
TRB2/M Support Documentation
TRB2/MCustomer Inspired! Locking Ball and Socket Mount, M6 Threaded
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