Solid Aluminum Breadboards with Access Aperture

  • Ø2" (50 mm) or Ø4" (100 mm) Central Aperture for Laser Beam or Cable Routing
  • Matte Black Anodized Finish Reduces Unwanted Reflections
  • 1/4"-20 (M6) Through-Tapped Mounting Holes


Four Counterbored
Ø1/4" (M6) Mounting Holes

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Specification Imperial Boards Metric Boards
Material Aluminum Tooling Plate
Finish Matte Black Anodized
Breadboard Thickness 0.5" 12.7 mm
Flatness ±0.006" Over 1 ft2 ±0.15 mm Over 0.3 m2
Coating Thickness 15 μm to 20 µm
Center Hole Diameter MB1218A: 2.0"
MB1824A: 4.0"
MB3045A/M: 50 mm
MB4560A/M: 100 mm
Hole Size and Spacing 1/4"-20 Tapped Holes on 1" Centers M6 Tapped Holes on 25 mm Centers
Distance from Edge
to First Hole
0.5" on All Sides 12.5 mm on All Sides
Number of Counterbored
Mounting Holes
Four Ø1/4" Located at Corners Inset 1" Four M6 Located at Corners Inset 25 mm
Anodized Breadboard
Click to Enlarge

These Breadboards Feature a Central Aperture for Routing Laser Beams or Cables.
Anodized Breadboard
Click to Enlarge

Periscope Assembly Being Used to Reroute a Beam through the Ø4" Center Access Hole of our MB1824A Breadboard


  • Ø2" (50 mm) or Ø4" (100 mm) Central Aperture for Routing Laser Beams or Cables
  • Standard Imperial and Metric Breadboard Hole Patterns
  • Offset Mounting Holes Allow a Full, Uninterrupted, Threaded Hole Matrix
  • Solid Aluminum with Low Reflection Anodized Surface
  • Custom Sizes and Options Available

These solid aluminum, nonmagnetic baseplates feature a central aperture for routing laser beams or for cable management and provide a convenient and cost-effective platform for assembling prototype optical assemblies, performing experiments, and mounting small subsystems. They are finished with a black, minimally reflective anodized coating and are through-drilled with a standard 1" (imperial) or 25 mm (metric) hole pattern offset 1/2" or 12.5 mm respectively, from the edges of the board.

Each breadboard features four counterbored mounting holes, offset from the array of threaded holes, which are counterbored to create an uninterrupted surface for any intended application. The four standard mounting holes are located at each corner of the breadboard, inset 1" from each edge (25 mm on metric). The mounting holes may be used to attach the breadboards to optical tables, other breadboards, mounting posts, brackets, or a variety of other surfaces or mounts. Please see the Mounting Options tab for more details.

Because the work surface holes are threaded completely through these breadboards, components can be mounted on both sides at once. Ø1.5" Mounting Posts allow for adjustments to the height of the optical axis by mounting the breadboards above the surface of an optical tabletop (or another board). The breadboards can also be mounted vertically using 90° or Vertical Mounting Brackets.

Other Breadboard Options and Accessories
For vacuum applications, we recommend using an unanodized breadboard; an unanodized breadboard with an access aperture must be ordered by contacting tech support. If the access aperture is not an essential feature, please consider our selection of standard Unanodized Breadboards.

Thorlabs also offers SlimLine Double Hole Density Aluminum Breadboards with 1/2" offset hole spacing, doubling the density of mounting holes. These are offered in sizes ranging from 4" x 24" to 8" x 36" (100 mm x 600 mm to 200 mm x 900 mm) with thicknesses of 0.5" (12.7 mm), making their slim profile ideal for compact work areas. The same double-hole-density pattern is also available on our circular breadboards.

For limited space applications, Thorlabs offers the MS12B and MS12B/M Mini-Series Breadboards. These breadboards feature increased tapped hole density and thinner breadboard thickness.

Optical Breadboard Enclosures are available to protect sensitive equipment from dust, stray light, acoustic noise, and thermal variations. Enclosures are offered completely sealed or with sliding door access. The breadboards can also be mounted vertically using 90° or Vertical Mounting Brackets, or can be raised using our Ø1.5" Mounting Posts.

Custom Breadboards
We offer a service for custom breadboard orders, with options that include hole pattern and spacing, size, thickness, and anodizing. For a quote, please fill out our custom breadboards form.

Mounting Options

Vertical Arrangement

Vertical Arrangement

Thorlabs' aluminum breadboards can be mounted vertically (or perpendicular to a mounting surface) using a wide variety of 90 degree mounting plates. For tall arrangements, we recommend the setup shown to the left. Here, the MB1218A breadboard is vertically oriented using two VB01 Vertical Brackets.

Rubber Damping Feet

Vibration Isolating Feet

Thorlabs' aluminum breadboards may be mounted on a set of AV2 Vibration Isolating Feet, rated for 32 kg. These sorbothane bumpers may be used to isolate a small breadboard from its mounting surface.

Not shown: Standard RDF1 Rubber Damping Feet may also be used where high vibrational damping is not necessary.

Adjustable Feet Mounts

Elevated Arrangement with Adjustable Mounting Feet

A set of Ø1.5" Post Mounts can be used to elevate an aluminum breadboard off of the work surface. At left, an MB1218A breadboard is shown with four P6 Mounting Posts. An adjustable, self-leveling BMF4 Mounting Foot is attached to each mounting post. The self-leveling mounting feet feature rubberized feet and screw thread height adjustment.

1.5" Post Mounting

Fixed Elevated Arrangement with Pedestal-Style Feet

A more permanent Aluminum Breadboard mounting option, shown to the left, features pedestal-style Ø1.5" Post Mounts clamped to an optic bench. The MB1218A Aluminum Breadboard to the left is elevated off the optic bench surface using a set of four P6 Mounting Posts, each with a PB4 Pedestal Base Adapter and PF175B Clamping Fork.

Not shown: Ø1.5" Translating Posts may also be used in lieu of the P6 Mounting Posts for applications requiring further height adjustment.


Breadboard Enclosure Systems

Enclosures may be added to Thorlabs' aluminum breadboards to house light and dust-sensitive equipment. Thorlabs offers a variety of plexiglass and standard darkening enclosures. The XE25C5 enclosure shown to the left has the front panel removed for access. Enclosures with sliding doors fabricated from plexiglass or black hardboard are also available.

Item # Dimensions
(L x W x H)
Unpackaged Packaged Shipping
Mass (kg) Weight (lbs) Mass (kg)a Weight (lbs)a
MB1218A 12" x 18" x 0.5" 4.47 9.85 5.00 11.00
MB1824A 18" x 24" x 0.5" 8.83 19.47 9.80 21.56
MB3045A/M 300 mm x 450 mm x 12.7 mm 4.33 9.55 4.90 10.78
MB4560A/M 450 mm x 600 mm x 12.7 mm 8.55 18.85 9.50 20.90
  • These weights are approximate and are subject to change. The information is only to be used as a guideline

Posted Comments:
vivien loo  (posted 2019-11-08 03:30:06.817)
Hello, we want to use the center ø100 hole as a rotation bed for a ø100 cylindrical piece. Before we start machining anything, we would like to know what is your tolerance on the ø100 hole. And what is the chamfer size on this hole ?
cwright  (posted 2019-11-12 07:52:39.0)
Response from Charles at Thorlabs: Hello Vivien, the tolerance on this hole is ± 0.10mm and the chamfer is cut at 45° with a depth of 0.3 mm.
mathieu.lemaire  (posted 2015-09-18 14:39:24.287)
Hi - is it possible to get a customized version of this product? I would like to know if it would be possible to get the aperture to be located in one of the corners as opposed to the center. Also - can you use thinner breadboard (0.25 inches)?
besembeson  (posted 2015-10-05 02:49:44.0)
Response from Bweh at Thorlabs USA: Yes that is possible. I will follow-up with you.
keewah.chan  (posted 2014-04-03 04:03:23.3)
Is there only two standard size (50mm and 100 mm) for central aperture of MB4560A/M? Do you provide thicker MB4560A/M?
jlow  (posted 2014-04-03 12:06:05.0)
Response from Jeremy at Thorlabs: We can quote custom sizes (including thicker versions) breadboard. We will contact you directly to discuss about this.
cbrideau  (posted 2014-03-06 13:23:20.623)
This sure beats having to take a hole saw to a breadboard after the fact! Can you come up with a kinematic assembly that sits in the hole like a turret for periscoping a beam up onto the breadboard deck?
msoulby  (posted 2014-03-07 11:12:18.0)
Response from Mike at Thorlabs: Thank you for your feedback; we have offered custom breadboards for some time now, however due to popular demand from customers we decided to release a standard range of breadboards with aperture ports for passing beams or mechanical parts through. We also already have a periscope assembly with kinematic adjustment that would easily fit into this porthole, please see part RS99/M

Solid Aluminum Breadboards with Access Aperture, Imperial

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
MB1218A Support Documentation
MB1218AAluminum Breadboard, 12" x 18" x 1/2", Ø2" Access Hole, 1/4"-20 Taps
MB1824A Support Documentation
MB1824AAluminum Breadboard, 18" x 24" x 1/2", Ø4" Access Hole, 1/4"-20 Taps
Lead Time

Solid Aluminum Breadboards with Access Aperture, Metric

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
MB3045A/M Support Documentation
MB3045A/MAluminum Breadboard, 300 mm x 450 mm x 12.7 mm, Ø50 mm Access Hole, M6 Taps
MB4560A/M Support Documentation
MB4560A/MAluminum Breadboard, 450 mm x 600 mm x 12.7 mm, Ø100 mm Access Hole, M6 Taps