Thorlabs CP08/M SM1-threaded cage plate screw size
M4 · length not stated in the sources
The screws used on Thorlabs CP08/M SM1-threaded cage plate are M4. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: metric variant uses M4 mounting tap where imperial uses 8-32.
This entry is marked confirmed and comes from 3doptix.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Thorlabs CP08/M SM1-threaded cage plate screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | Metric variant uses M4 mounting tap where imperial uses 8-32 | Confirmed |
Fitment records and sources
Metric variant uses M4 mounting tap where imperial uses 8-32
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Camera and optics hardware often uses short screws into thin threaded plates, so check engagement before tightening fully.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- There is no single standard Picatinny/rail screw size; makers use metric M3/M4 and imperial 6-48 or 8-40 interchangeably. Always measure the existing screw.
- D-sub jackscrews come in both metric M3 and imperial 4-40 — identical looking, not interchangeable.
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Browse all 278 in Cameras & Optics →The same screw also fits
Devices whose records share a thread with Thorlabs CP08/M SM1-threaded cage plate, closest length match first.
- Thorlabs LCP35/M 60mm cage plate with Ø2" double-bore optic mount also M4
- Sig Sauer ROMEO1 Pro mounting screw also M4
- Thorlabs LCP35/M 60 mm cage plate also M4
- ATC (Advanced Transportation Controller) traffic signal cabinet standard also M4
- Thorlabs KMS/M compact kinematic mirror mount also M4
- Shield Sights optic-ready / dovetail red dot mounts also M4
- SmallRig 2245 SSD Clamp for BMPCC 4K/6K cages also M4
- Thorlabs CP14/M 30mm cage plate also M4
Questions about Thorlabs CP08/M SM1-threaded cage plate screws
- What size screw does Thorlabs CP08/M SM1-threaded cage plate use?
- M4 for metric variant uses M4 mounting tap where imperial uses 8-32.
- How long are the screws in Thorlabs CP08/M SM1-threaded cage plate?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Thorlabs CP08/M SM1-threaded cage plate?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.