Right-Angle Mounting Adapters for Breadboards


  • Stably Mount Small or Large Components at 90°
  • Slotted, Counterbored, and Tapped Holes Enable 
    Virtually Any Configuration
  • Fabricated from Black Anodized Aluminum

AP90RL

Large Right-Angle Bracket

AB90A

Right-Angle Bracket

VB01A

Vertical Bracket

AP90

Right-Angle Plate

Two AB90 Brackets Mounting an MB1218 Breadboard to an Optical Table

Related Items


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The brackets and plates featured on this page allow for our Solid Aluminum Breadboards to be mounted at 90° to an optical table. The mounting bracket or plate most appropriate for breadboard mounting depends on the size of the breadboard and the setup. For example, the AP90RL is ideal for use with larger breadboards requiring central support, whereas the VB01A is ideal for smaller breadboards requiring outer support. We recommend mounting only our smallest breadboards using the small right-angle brackets and plates.

All parts shown here are constructed from single aluminum blocks, providing exceptional precision and rigidity. Dimensions of each bracket and plate are provided in the PDF drawing under Docs (info icon), located next to the Part Number, below. Each mounting bracket or plate can be attached to our solid aluminum breadboards using our cap screws and balldrivers.


Posted Comments:
Roland D'Entremont  (posted 2021-10-23 14:42:53.567)
The model for VB01A/M has incorrect dimension between the center tapped hole and the clearance hole above it. In other words the hole is not spaced at 12.5mm. It is 14.94. making the top M6 to bottom M6 tapped hole spaces at 102.41mm instead of 100mm.
azandani  (posted 2021-11-04 11:03:12.0)
Hello Roland, thank you for contacting Thorlabs. Although the specific dimensions mentioned are not specified in the CAD file we provide, you are absolutely correct, the spacing between the center tapped hole and the clearance hole is indeed 14.94 mm. This makes the total distance between the first tapped M6 hole to the last M6 tapped hole 102.41 mm.
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Vertical Brackets

VB01 Application
Click to Enlarge

VB01 Holding an MB1224 Breadboard
  • Mount Large Breadboards at a 90° Angle
  • One-Piece Construction for Excellent Rigidity
  • Parallel and Perpendicular Within 0.003" (0.07 mm)
  • 6", 11.75", or 18" Brackets Available
  • Each Bracket Sold Individually

These Vertical Brackets are designed to mount any of our aluminum breadboards vertically on an optical table. The edges contain 1/4" (M6) clearance holes and 1/4"-20 (M6) tapped holes at regular spacings, providing a high degree of mounting flexibility. The VB01A(/M) has three 1/4"-20 (M6) tapped holes along the 45° edge for additional mounting options. 6", 11.75", and 18" tall brackets are available.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
VB01A Support Documentation
VB01A6" Vertical Bracket for Breadboards, 1/4"-20 Holes, 1 Piece
$84.94
Today
VB01 Support Documentation
VB0111.75" Vertical Bracket for Breadboards, 1/4"-20 Holes, 1 Piece
$108.69
Today
VB01B Support Documentation
VB01B18" Vertical Bracket for Breadboards, 1/4"-20 Holes, 1 Piece
$150.50
Today
+1 Qty Docs Part Number - Metric Price Available
VB01A/M Support Documentation
VB01A/M6" Vertical Bracket for Breadboards, M6 Holes, 1 Piece
$84.94
Today
VB01/M Support Documentation
VB01/M11.75" Vertical Bracket for Breadboards, M6 Holes, 1 Piece
$108.69
Today
VB01B/M Support Documentation
VB01B/M18" Vertical Bracket for Breadboards, M6 Holes, 1 Piece
$150.50
Today
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Large Right-Angle Bracket

AP90RL Holding Breadboard
Click to Enlarge

Two AP90RL Brackets Connected by an Arched Slot
MSAP90 ApplicationClick to Enlarge
AP90RL Holding MB12 Breadboard Vertically
  • Large Mounting Surface with Tapped Holes on Front, Sides, and Top
  • Two Arched Slots for Rotating Base by up to ±50°
  • One-Piece Aluminum Construction for Excellent Rigidity
  • Parallel and Perpendicular to Within 0.002" (0.05 mm)
  • Physical Dimensions: 5.00" x 3.40" x 7.00" (127.0 mm x 86.4 mm x 177.8 mm)

The AP90RL(/M) Large Angle Bracket is a heavy-duty component ideal for mounting breadboards and other bulky optomechanics at right angles to an optical table. The front, sides, and top contain a generous array of 1/4"-20 (M6) tapped holes and clearance holes, and the front additionally provides two parallel 2.40" (61 mm) long clearance slots. The base contains two 1/4"-20 (M6) clearance slots and five clearance holes, as well as two arched 1/4"-20 (M6) slots that provide continuous rotation of ±50° prior to fastening the bracket down.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
AP90RL Support Documentation
AP90RLLarge Right-Angle Bracket, 1/4"-20 Holes
$194.83
Today
+1 Qty Docs Part Number - Metric Price Available
AP90RL/M Support Documentation
AP90RL/MLarge Right-Angle Bracket, M6 Holes
$194.83
Today
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Right-Angle Plates

MSAP90 ApplicationClick to Enlarge
AP90L with MB636 Breadboard
  • One-Piece Aluminum Construction for Excellent Rigidity
  • Angled Rear Support Structure Reinforces Mounted Optomechanics
  • Parallel and Perpendicular to Within 0.002" (0.05 mm)
  • Physical Dimensions:
    • AP90(/M): 2.88" x 2.50" x 3.00" (73.2 mm x 63.5 mm x 76.2 mm)
    • AP90L(/M): 8.80" x 2.50" x 3.00" (223.5 mm x 63.5 mm x 76.2 mm)

The AP90(/M) Right-Angle Plate is an ideal solution for building sturdy three-dimensional optomechanical assemblies that require vertical positioning. This plate provides four 1/4"-20 (M6) clearance slots, seven 1/4"-20 (M6) tapped holes, and two 1/4"-20 (M6) counterbores oriented at 90° from the optical table surface. Its base contains two 1.30" (34 mm) long, 1/4"-20 (M6) clearance slots and two 1/4"-20 (M6) counterbores for mounting to an optical table.

Our AP90L(/M) Large Right-Angle Plate is a heavy-duty mount, capable of holding breadboards at 90° relative to an optical table's surface. This plate provides a generous array of 31 1/4"-20 (M6) tapped holes and six 1/4"-20 (M6) counterbores oriented at 90° from the optical table surface. Its base contains three 1/4"-20 (M6) clearance slots and six 1/4"-20 (M6) counterbored holes for mounting to an optical table.

For an alternative 90° mounting option, the top plate on our AP180 Adjustable Angle Plate can be positioned to provide mounting configurations similar to the AP90. Thorlabs also offers 45° and 30°/60° mounting plates.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
AP90 Support Documentation
AP90Right-Angle Mounting Plate, 1/4"-20 Compatible
$94.74
Today
AP90L Support Documentation
AP90LLarge Right-Angle Mounting Plate, 1/4"-20 Compatible
$185.91
Today
+1 Qty Docs Part Number - Metric Price Available
AP90/M Support Documentation
AP90/MRight-Angle Mounting Plate, M6 x 1.0 Compatible
$94.74
Today
AP90L/M Support Documentation
AP90L/MLarge Right-Angle Mounting Plate, M6 x 1.0 Compatible
$185.91
Today
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Right-Angle Brackets for 1/4"-20 (M6) Cap Screws

Product Image
(Click to Enlarge)
AB90 AB90A(/M) AB90B(/M) AB90C(/M)
Item # AB90 AB90A(/M) AB90B(/M)a AB90C(/M)
Counterbored Mounting Slots Two 1/4" (M6) Slots Two 1/4" (M6) Slots N/A One 1/4" (M6) Slot
Counterbored Mounting Holes N/A N/A Two 1/4" (M6) Holes N/A
Tapped Holes None Six 1/4"-20 (M6) Holes
per Side
Two 1/4"-20 (M6) Holes
per Side
Three 1/4"-20 (M6) Holes
on One Side
Dimensions (L x W x H)
[Click for Mechanical Drawing]
2.00" x 1.50" x 2.00"
(50.8 mm x 38.1 mm x 50.8 mm)
2.00" x 1.50" x 2.00"
(50.8 mm x 38.1 mm x 50.8 mm)
2.00" x 0.75" x 2.00"
(50.8 mm x 19.1 mm x 50.8 mm)
2.00" x 0.75" x 2.00"
(50.8 mm x 19.1 mm x 50.8 mm)
  • Please note that both counterbores are located 1.18" from the base of the bracket. On our breadboards, the first row of tapped through holes is located 0.50" from the edge. Thus, when mounting a breadboard with this bracket, the breadboard will rise approximately 0.68" above the base of the bracket.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
AB90A Support Documentation
AB90ACustomer Inspired! Right-Angle Bracket with Counterbored Slots & 1/4"-20 Tapped Holes
$30.58
Today
AB90B Support Documentation
AB90BCustomer Inspired! Slim Right-Angle Bracket with Counterbored & 1/4"-20 Tapped Holes
$30.58
Today
AB90C Support Documentation
AB90CCustomer Inspired! Slim Right-Angle Bracket with Counterbored Slot & 1/4"-20 Tapped Holes
$30.58
Today
+1 Qty Docs Part Number - Universal Price Available
AB90 Support Documentation
AB90Right-Angle Bracket with Counterbored Slots
$30.58
Today
+1 Qty Docs Part Number - Metric Price Available
AB90A/M Support Documentation
AB90A/MCustomer Inspired! Right-Angle Bracket with Counterbored Slots and M6 Tapped Holes
$30.58
Today
AB90B/M Support Documentation
AB90B/MCustomer Inspired! Slim Right-Angle Bracket with Counterbored & M6 Tapped Holes
$30.58
Today
AB90C/M Support Documentation
AB90C/MCustomer Inspired! Slim Right-Angle Bracket with Counterbored Slot & M6 Tapped Holes
$30.58
Today
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Mini-Series Right-Angle Plate

  • One-Piece Aluminum Construction for Excellent Rigidity
  • Angled Rear Support Structure Reinforces Mounted Optomechanics
  • Parallel and Perpendicular to Within 0.02" (0.05 mm)

Our MSAP90(/M) Mini-Series Right-Angle Plate, based upon our popular AP90 Right-Angle Plate design, is an ideal solution for constructing rigid three-dimensional assemblies with our Mini-Series components. This bracket provides four 4-40 (M3) clearance slots, seven 4-40 (M3) tapped holes, and two 4-40 (M3) counterbores oriented at 90° from an optical table surface. Its base contains two 1.0" (25.4 mm) long, 4-40 (M3) clearance slots and two 4-40 (M3) counterbores for mounting to a Mini-Series Breadboard.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
MSAP90 Support Documentation
MSAP90Mini-Series Right-Angle Bracket, 4-40 Holes
$52.18
Today
+1 Qty Docs Part Number - Metric Price Available
MSAP90/M Support Documentation
MSAP90/MMini-Series Right-Angle Bracket, M3 Holes
$52.18
Today