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Screw Thread Adapters![]()
AI25E8E Internal 8-32 Internal 1/4"-20 AS4M8E Internal M4 x 0.7 External 8-32 CBA25E 1/4"-20 Thread 0.40" Outer Diameter AE8E25E Internal 8-32 External 1/4"-20 AP6M8E External M6 x 1.0 External 8-32 MSA8 Internal 4-40 External 8-32 MSA25 Internal 4-40 External 1/4"-20 HW-KIT6 Thread Adapter Kit ![]() Please Wait
![]() Rail Carrier Cross Section with SD1 Counterbore Adapter Ring Threading Adapters
Thorlabs' selection of thread adapters offers numerous options for switching between M3, M4, M6, 4-40, 6-32, 8-32, and 1/4"-20 thread sizes. Choose from internal-to-external, external-to-external, or internal-to-internal thread adapters. We also offer internal-to-external threaded stud adapters. Our external-to-external and internal-to-external thread adapters can be adjusted with a screwdriver on either end. The internal-to-internal thread adapters and internal-to-external threaded stud adapters feature a through hole to provide additional torque when tightening or loosening. The Mini-Series thread adapters can be used to make the Mini-Series posts compatible with our extensive range of optical mounts. Counterbore AdaptersThreaded counterbore adapters are used to convert a counterbore to a threaded hole. A part such as the KM100 kinematic mirror mount features counterbores to provide imperial and metric compatibility. A cap screw is typically used to fasten these mounts to a post, but in some instances it is necessary to attach the mount to a post with a fixed threaded stud. The counterbore adapter allows parts, such as the KM100, to be post mounted when a cap screw cannot be used. The SD1 is an adapter ring that provides a means to attach 8-32 (M4) tapped components to 1/4"-20 (M6) counterbored parts. One possible use for the SD1 is in a dovetail optical rail setup where the RC1 rail carriers feature a 1/4" (M6) counterbore. Optic mounts are commonly attached to RC1 rail carriers and usually require the SD1 adapter as most optic mounts are 8-32 (M6) tapped. Thread Adapter KitsThread Adapter Kits are available in both imperial and metric varieties. Both kits come packaged in an organizing box with convenient scaled drawing labels and contain our most popular thread adapters. See below for a list of the specific adapters contained in each kit.
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![]() Click to Enlarge Mini-Series Thread Adapters ![]()
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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.
![]() ![]() Rail Carrier Cross Section with SD1 Counterbore Adapter Ring
The SD1 adapter ring allows a #8 (M4) cap screw to be used within the 1/4" (M6) counterbore of many parts including rail carriers, BA2 mounting bases, etc. Most of our optomechanical components, such as our compact mirror mounts, feature tapped 8-32 (M4) holes, which this adapter is designed for. For example, the VC1 small V-clamp can mount directly to a BA1 base when an SD1 adapter is used with a 8-32 cap screw. ![]() ![]()
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