Products HomeCounterbore Adapters
- Convert a Counterbored Clearance Hole into a Tapped Hole
- Convert a 1/4" (M6) Clearance Hole into a #8 (M4) Clearance Hole
CBA25E
CBA8E
SD1
Cross Section of RC2 Rail Carrier with Included SD1 Counterbore Adapter Ring
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Counterbore adapters are used to mate two parts that support different thread standards. The counterbore insert or adapter ring has an outer diameter that matches the standard counterbore diameters used by Thorlabs. The counterbore inserts have a threaded inner bore while the adapter ring has a clearance hole for an #8-32 (M4) screw.
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- Converts a Counterbored Clearance Hole into a Tapped Hole
- Slotted Edge for Tightening
- Designed for Slip Fit with Thorlabs' Counterbores
Threaded counterbore adapters are used to convert a counterbore into a threaded hole. A part such as the KM100 Kinematic Mirror Mount features a counterbore that provides imperial and metric compatibility; a cap screw is typically used to fasten the mount to a post. In some instances, it may be necessary to attach the mount to a post with a fixed threaded stud. The counterbore adapter facilitates this mounting option. These adapters feature a slotted edge that enables tightening or removal.
| Item # | Thread A (Internal) |
Outer Diameter B | Use in C-Bore |
|---|---|---|---|
| CBA8E | 8-32 | 0.28" (7.0 mm) | #8 |
| CBA25E | 1/4"-20 | 0.40" (10.2 mm) | 1/4" |
| CBA4M | M4 x 0.7 | 0.28" (7.0 mm) | M4 |
| CBA6M | M6 x 1.0 | 0.40" (10.2 mm) | M6 |
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Cross Section of RC2 Rail Carrier with Included SD1 Counterbore Adapter Ring
- Use an 8-32 or M4 Cap Screw in a 1/4" or M6 Counterbore
- Package of 10 Adapters
The SD1 stainless steel adapter ring allows an 8-32 or M4 cap screw to be used within the 1/4" or M6 counterbores found on many optomechanical components.
Counterbore Adapters