Unanodized, Circular, Solid Aluminum Optical Breadboards, Double Density Holes

Unanodized Finish for Use in Vacuum Applications
Acid Etched and Vacuum Sealed for Immediate Use
Through-Tapped Mounting Holes
Custom Sizes Available

MBR12U

Ø12.00" Aluminum Breadboard

Counterbored Ø1/4"
(M6) Mounting Holes

MBR6U

Ø5.87" Aluminum Breadboard

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Overview
Weights and Dims
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Diagram of the MBR6U Breadboard. For similar diagrams of the other circular breadboards, please see the Weights & Dims tab.

Specification	Imperial Boards	Metric Boards
Material	C250 Aluminum
Finish	Precision Ground, Matte Finish
Cleaning and Packing	Acid Etched and Vacuum Sealed
Size	Ø5.87" and Ø12"	Ø149 mm and Ø300 mm
Breadboard Thickness	0.5"	12.7 mm
Flatness	±0.006" over 1 ft²	±0.15 mm over 0.09 m²
Holes	1/4"-20 Taps	M6 Taps
Hole Spacing	1" Centers Double Density Pattern	25 mm Centers Double Density Pattern
Counterbores	Four 1/4" Holes	Four M6 Holes
Vacuum Compatibility as Packaged	10^-6 Torr
Preparation and Packaging	Chemically Cleaned and Vacuum Bagged

Features

Precision Manufactured Unanodized Surface for Vacuum Applications
Acid Etched and Vacuum Sealed for Immediate Use
Electrically Conductive for Applications Requiring a Common Ground
Counterbored Mounting Holes for Attaching to an Optical Table or Breadboard Feet
Circular Geometry Saves Space
Same Hole Pattern as Our Double-Hole-Density Breadboards

Thorlabs' circular, unanodized, double-density breadboards are constructed from a 1/2" (12.7 mm) thick aluminum plate; this thickness is sufficient to maintain flatness over the full area (see the table to the right for flatness specifications). These nonmagnetic breadboards feature 1/4"-20 (M6) tapped holes at twice the density of our standard 1" (25 mm) hole pattern to provide a convenient platform for assembling prototype optical assemblies, conducting experiments, and mounting small subsystems. Please see the Weights & Dims tab for breadboard diagrams that call out the hole spacings.

Each breadboard offers four 1/4" (M6) counterbored mounting holes for attaching the breadboard to an optical table, another breadboard, mounting posts, brackets, breadboard feet, or other surfaces and mounts.

Vacuum Compatibility Information
These vacuum-compatible breadboards are chemically cleaned and prepared for vacuum applications before packaging. They are compatible directly out of the packaging with vacuum environments down to 10^-6 Torr. With additional cleaning and processing, they can be used at even lower pressures, only limited by the outgassing rate of the aluminum. The material properties of the aluminum and the cleaning methods completed by the end user should be used to determine the appropriateness of these products and materials in a specific vacuum system.

Thorlabs also offers rectangular double-hole-density optical breadboards, as well as rectangular standard-hole-density breadboards and unanodized, vacuum-compatible breadboards. Custom sizes of all breadboards are also available. Please contact Tech Support for more information.

Item #	Dimensions	Unpackaged		Packaged Shipping
Item #	Dimensions	Mass (kg)	Weight (lb)	Mass (kg)^a	Weight (lb)^a
MBR6U	Ø6.00" x 0.50"	0.56	1.23	0.57	1.26
MBR12U	Ø12.00" x 0.50"	2.34	5.16	2.59	5.71
MBR150U/M	Ø150.0 mm x 12.7 mm	0.56	1.23	0.57	1.26
MBR300U/M	Ø300.0 mm x 12.7 mm	2.27	5.00	2.66	5.86

These weights are approximate and are subject to change. The information is only to be used as a guideline.

Below are diagrams calling out the dimensions on each breadboard. Please note that the breadboards are not shown proportionally to one other.

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Posted Comments:

j.travers (posted 2016-08-02 14:32:04.22)

Do you do custom sizes? I'm looking for a diameter of around 200 mm to 250 mm, with metric mounting holes.

bwood (posted 2016-08-03 04:17:32.0)

Response from Ben at Thorlabs: Thank you for your question. I am pleased to say we have a wide array of custom capabilities within our breadboard ranges, including these circular, anodised breadboards. Once you have finalised the specifications of your required breadboard, please contact your local Thorlabs technical support office to being the quoting process.

Unanodized, Circular, Solid Aluminum Optical Breadboards, Double Density Holes

Features

Unanodized, Solid Aluminum Circular Breadboards, Double Density (Imperial)

Unanodized, Solid Aluminum Circular Breadboards, Double Density (Metric)