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Table Clamps


  • Secure Optomechanical Assemblies to Tables and Breadboards
  • Versatile and Distinct Designs for Virtually Any Situation
  • Solid One-Piece Construction

CL2

Our Most Popular
Heavy-Duty Clamp

CL3

Compact
Clamp with
Variable Height

CL4

For Tight Spaces

CL5A

General-Purpose Clamp

CL6

For Dovetail Optical Rails

CL8

For Ø1" and
Ø1.5" Pedestal Posts

Related Items


Please Wait
Item # Component Thickness
Minimum Maximum
CL5 0" 0.50" (12.7 mm)
CL5A 0" 0.80" (20.3 mm)
CL2(/M) Variablea
CL3(/M) Variablea
CL6 0" 0.25" (6.4 mm)
XE25CL2 For 25 mm Railsb
CL4 0.02" (0.5 mm) 0.25" (6.4 mm)
CL8 0" 0.30" (7.6 mm)
  • The thickness of components that can be used with this clamp depends on the length of the screws used to secure the clamp.
  • The XE25CL2 is designed to hook onto the side of a 25 mm construction rail in order to secure it to the optical table.

Options

  • CL5 and CL5A: General-Purpose Clamps
  • CL2: Heavy-Duty Clamp with Adjustable Height
  • CL3: Compact Clamp with Adjustable Height
  • CL6: Wedged for Use with Dovetail Optical Rails
  • XE25CL2: Hooked Lip for Use with 25 mm Rails
  • CL4: Compact Clamp for Tight Spaces
  • CL8: Table Clamp for Ø1" and Ø1.5" Pedestal Posts

Thorlabs' Table Clamps are useful when constructing optomechanical assemblies. The design of our clamps helps to reduce an assembly's setup time by adapting complex layouts to any mounting hole pattern. Each clamp is suitable for securing bases and other optomechanical components with thicknesses in the ranges specified in the table to the right. These clamps are used with 1/4"-20 (M6) cap screws and washers, which are available as part of our Screw Kits.

For added convenience, the CL5, CL5A, CL2(/M), and CL3(/M) are also sold in packs of 5.


Posted Comments:
jhigbie  (posted 2015-07-24 21:03:50.95)
I think it would be very useful to have some smaller versions of these clamps. For example, to attach odd-shaped mounts/objects to translation stages, when the hole pattern doesn't allow directly screwing them in. For some purposes, the length of the CL4 or CL6 is just too great, and a shorter clamp (perhaps with a 8-32 clamping screw) would be very handy. ( I just machined a couple such clamps today to clamp a piezo stage on a Thorlabs mechanical stage, but would rather buy them from Thorlabs...)
besembeson  (posted 2015-09-23 06:22:52.0)
Response from Bweh at Thorlabs USA: We have the mini series general purpose clamps, the MSCL3 for example that uses a #4-40 cap screw if the CL4 and CL6 are too large. I will contact you to find out what stage this was used for and the general dimensions of the clamp you machined so that we can look into filling the #8-32 cap screw gap to serve more users.
jlow  (posted 2012-10-09 11:05:00.0)
Response from Jeremy at Thorlabs: The drawing for the CL2 can be found at http://www.thorlabs.com/Thorcat/0100/CL2-AutoCADPDF.pdf, which have all the dimensions that you are looking for. The SolidWorks model can be found at http://www.thorlabs.com/Thorcat/0100/CL2-Solidworks.sldprt.
gregori.monoenko  (posted 2012-10-09 10:20:58.0)
what is the width of cl2? what is the location of the 1/4-20 tap? what is the location and dimension of the slot? I have to model this part and add it to the assembly . thanks, greg monoenko

General-Purpose Table Clamps

CL5A Clamping a Base
Click for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
BA2S61Spacer, 2" x 3", 0.500" Thick
SH25S10011/4"-20 Stainless Steel Cap Screw, 1" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL5A1Table Clamp, L-Shape, Rounded Lip
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, Pack of 25
View Metric Product List
Item #QtyDescription
Metric Product List
BA2S6/M1Spacer, 50 mm x 75 mm, 12.5 mm Thick
SH6MS251M6 x 1.0 Stainless Steel Cap Screw, 25 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL5A1Table Clamp, L-Shape, Rounded Lip
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, Pack of 25
CL5A Clamp Holding Down a BA2S6 0.5" Thick Base
CL5 Clamping a Base
Click for Details
View Imperial Product List
Item #QtyDescription
Product List
SH25S10011/4"-20 Stainless Steel Cap Screw, 1" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL51Table Clamp, L-Shape
BA21Mounting Base, 2" x 3" x 3/8"
PH31Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, Pack of 25
View Metric Product List
Item #QtyDescription
Metric Product List
SH6MS251M6 x 1.0 Stainless Steel Cap Screw, 25 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL51Table Clamp, L-Shape
BA2/M1Mounting Base, 50 mm x 75 mm x 10 mm
PH75/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=75 mm
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, Pack of 25
CL5 Clamp Holding Down a BA2 Base
CL5 Cross Section
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CL5 Cross-Sectional View
CL5 Cross Section
Click for Details

CL5A Cross-Sectional View

The CL5 table clamp has a simple design that is compatible with most common optomechanics. It only requires one cap screw and washer to secure. This clamp can be used with optomechanical components with a thickness up to 0.50".

The CL5A table clamp is similar in design to the CL5, but a curved lip allows the clamp to be used with thicker optomechanical components. The CL5A can be used with components up to 0.80" thick. At higher clamping angles, the rounded edge remains in contact with the top of the component, rather than pushing against the corner. This maintains a downward force and prevents unwanted horizontal movement on the table. In addition, the bottom of the clamp has a rounded edge with a relief cut to allow for sturdier contact between the clamp and optical table, especially when the clamp is used at a high angle.

For added convenience, the CL5 and CL5A are also sold in packs of 5.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CL5 Support Documentation
CL5Table Clamp, L-Shape
$4.34
Today
CL5-P5 Support Documentation
CL5-P5Table Clamp, L-Shape, 5 Pack
$20.62
Today
CL5A Support Documentation
CL5ATable Clamp, L-Shape, Rounded Lip
$4.04
3-5 Days
CL5A-P5 Support Documentation
CL5A-P5Table Clamp, L-Shape, Rounded Lip, 5 Pack
$19.19
3-5 Days

Heavy-Duty Table Clamp with Adjustable Height

CL2 Clamping a Spacer
Click for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
CL21Heavy-Duty Variable Height Clamp, 1/4"-20 Tapped
BA2S71Spacer, 2" x 3", 1.000" Thick
KM2001Kinematic Mirror Mount for Ø2" Optics
SH25S20011/4"-20 Stainless Steel Cap Screw, 2" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
PH21Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
PF20-03-F011Ø2" UV-Enhanced Aluminum Mirror
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, Pack of 25
View Metric Product List
Item #QtyDescription
Metric Product List
CL2/M1Heavy-Duty Variable Height Clamp, M6 Tapped
BA2S7/M1Spacer, 50 mm x 75 mm, 25 mm Thick
KM2001Kinematic Mirror Mount for Ø2" Optics
SH6MS501M6 x 1.0 Stainless Steel Cap Screw, 50 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
PH50/M1Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
PF20-03-F011Ø2" UV-Enhanced Aluminum Mirror
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, Pack of 25
CL2 Clamp Holding BA2S7 Spacer on Table
CL2 Cross Section
Click for Details

CL2 Cross-Sectional View

The CL2(/M) heavy-duty table clamp uses two cap screws: one in the 1/4"-20 (M6) tapped hole to adapt the clamp to virtually any height and another in the slotted hole to secure the clamp to the table. The extra-long design increases the force exerted on the optomechanic being held.

The thickness of optomechanical components that can be used with the CL2(/M) clamp depends on the length of the screws used to secure the clamp.

For added convenience, the CL2(/M) is also sold in packs of 5.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
CL2 Support Documentation
CL2Heavy-Duty Variable Height Clamp, 1/4"-20 Tapped
$6.99
Today
CL2-P5 Support Documentation
CL2-P5Heavy-Duty Variable Height Clamp, 1/4"-20 Tapped, 5 Pack
$34.94
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
CL2/M Support Documentation
CL2/MHeavy-Duty Variable Height Clamp, M6 Tapped
$6.99
Today
CL2/M-P5 Support Documentation
CL2/M-P5Heavy-Duty Variable Height Clamp, M6 Tapped, 5 Pack
$34.94
Today

Compact Table Clamp with Adjustable Height

CL3 Clamping a Breadboard
Click for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
CL31Compact Variable Height Clamp, 1/4"-20 Tapped
SH25S10011/4"-20 Stainless Steel Cap Screw, 1" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
MB61216" x 12" x 1/2" Aluminum Breadboard, 1/4"-20 Double-Density Taps
View Metric Product List
Item #QtyDescription
Metric Product List
CL3/M1Compact Variable Height Clamp, M6 Tapped
SH6MS251M6 x 1.0 Stainless Steel Cap Screw, 25 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
MB1530/M1150 mm x 300 mm x 12.7 mm Aluminum Breadboard, M6 Double-Density Taps
CL3 Clamp Holding
Double-Density Breadboard
CL3 Cross Section
Click Details

CL3 Cross-Sectional View

The CL3(/M) table clamp uses two cap screws: one in the 1/4"-20 (M6) tapped hole to adapt the clamp to virtually any height and another in the slotted hole to secure the clamp to the table. Its compact design reduces the footprint of the clamp relative to the CL2(/M).

The thickness of optomechanical components that can be used with the CL3(/M) clamp depends on the length of the screws used to secure the clamp.

For added convenience, the CL3(/M) is also sold in packs of 5.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
CL3 Support Documentation
CL3Compact Variable Height Clamp, 1/4"-20 Tapped
$5.15
Today
CL3-P5 Support Documentation
CL3-P5Compact Variable Height Clamp, 1/4"-20 Tapped, 5 Pack
$25.76
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
CL3/M Support Documentation
CL3/MCompact Variable Height Clamp, M6 Tapped
$5.15
Today
CL3/M-P5 Support Documentation
CL3/M-P5Compact Variable Height Clamp, M6 Tapped, 5 Pack
$25.76
Today

Table Clamps for Construction Rails

XE25CL2 Clamped to Table
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
XE25CL21Table Clamp for 25 mm Rails
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
SH25S07511/4"-20 Stainless Steel Cap Screw, 3/4" Long, Pack of 25
XE25L12112" Long Construction Rail
View Metric Product List
Item #QtyDescription
Metric Product List
XE25CL21Table Clamp for 25 mm Rails
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
SH6MS201M6 x 1.0 Stainless Steel Cap Screw, 20 mm Long, Pack of 25
XE25L300/M1300 mm Long Construction Rail
XE25CL2 Clamp and 25 mm Rail
CL6 Clamping a Rail
Click for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
CL62Table Clamp, RLA Series Optical Rails
RLA06001Dovetail Optical Rail, 6", Imperial
SH25S07511/4"-20 Stainless Steel Cap Screw, 3/4" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
View Metric Product List
Item #QtyDescription
Metric Product List
CL62Table Clamp, RLA Series Optical Rails
RLA150/M1Dovetail Optical Rail, 150 mm, Metric
SH6MS201M6 x 1.0 Stainless Steel Cap Screw, 20 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL6 Clamp and
Dovetail Optical Rail
CL5 Cross Section
Click for Details

CL6 Cross-Sectional View
CL5 Cross Section
Click for Details

XE25CL2 Cross-Sectional View

The CL6 clamp features a wedged tip that is specifically designed to fit our dovetail optical rails, allowing a rail to be secured along any direction on a breadboard or optical table. The low-profile clamp has the same height as a dovetail rail, although its presence can restrict the placement of rail carriers. The CL6 clamp can be used with optomechanical components up to 0.25" thick.

The XE25CL2 Table Clamp mounts a 25 mm rail horizontally to a 1/4"-20 or M6 tapped surface by using a rail channel. It holds the rail in place using a side-located rail channel, while leaving the top rail channel free to accept enclosure panels or T-Nuts. The clamp features a 1" (25.4 mm) long clearance slot compatible with 1/4"-20 and M6 screws, providing mounting for imperial and metric tables.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CL6 Support Documentation
CL6Table Clamp, RLA Series Optical Rails
$6.02
Today
XE25CL2 Support Documentation
XE25CL2Table Clamp for 25 mm Rails
$11.83
Today

Compact Table Clamp for Tight Spaces

CL4 Clamping a Base
Click to Enlarge
View Imperial Product List
Item #QtyDescription
Imperial Product List
BA2R1Magnetic Mounting Base, 2" x 3" x 3/8"
SH25S07511/4"-20 Stainless Steel Cap Screw, 3/4" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL41Table Clamp, Tight Space Applications
PH32Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 3"
TR32Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
BA1SR1Magnetic Mounting Base, 1" x 2.3" x 3/8"
SH25S03811/4"-20 Stainless Steel Cap Screw, 3/8" Long, Pack of 25
View Metric Product List
Item #QtyDescription
Metric Product List
BA2R/M1Magnetic Mounting Base, 50 mm x 75 mm x 10 mm
SH6MS201M6 x 1.0 Stainless Steel Cap Screw, 20 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL41Table Clamp, Tight Space Applications
PH3/M2Post Holder with Spring-Loaded Hex Locking Thumbscrew, L = 76.2 mm
TR75/M2Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
BA1SR/M1Magnetic Mounting Base, 25 mm x 58 mm x 10 mm
SH6MS101M6 x 1.0 Stainless Steel Cap Screw, 10 mm Long, Pack of 25
CL4 Clamp Placed between a BA2R and a BA1SR
CL4 Cross Section
Click for Details

CL4 Cross-Sectional View

At just 1.38" long and 0.63" wide, the CL4 table clamp is our most compact table clamp option, designed for situations where table space is at a premium. It requires one cap screw and washer to secure.

This clamp can be used with optomechanical components with a thickness up to 0.25".

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CL4 Support Documentation
CL4Table Clamp, Tight Space Applications
$6.22
Today

Table Clamp for Ø1" and Ø1.5" Pedestal Posts

CL8 Cross Section
Click to Enlarge

CL8 Cross-Sectional View
CL8 Clamping a Pedestal Post
Click for Details
View Imperial Product List
Item #QtyDescription
Imperial Product List
CL82Ø1" and Ø1.5" Pedestal Post Table Clamp
RS4P8E1Ø1" Pedestal Pillar Post, 8-32 Taps, L = 4"
SH25S07511/4"-20 Stainless Steel Cap Screw, 3/4" Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
View Metric Product List
Item #QtyDescription
Metric Product List
CL82Ø1" and Ø1.5" Pedestal Post Table Clamp
RS4P4M1Ø25.0 mm Pedestal Pillar Post, M4 Taps, L = 100 mm
SH6MS201M6 x 1.0 Stainless Steel Cap Screw, 20 mm Long, Pack of 25
W25S05011/4" Washer, M6 Compatible, Stainless Steel, Pack of 100
CL8 Clamps Securing
Ø1" Pedestal Post

The CL8 pedestal post table clamp is designed for use with our Ø1" and Ø1.5" pedestal posts. Its V-shaped tip provides two-point contact with the perimeter of the post and its rounded edge increases the contact area along the optical table or breadboard. It requires one cap screw and washer to secure.

The CL8 clamp can be used with optomechanical components up to 0.30" thick.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CL8 Support Documentation
CL8Ø1" and Ø1.5" Pedestal Post Table Clamp
$8.06
Today
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