Thorlabs LCP35/M 60mm cage plate screw size
M4 · length not stated in the sources
Our records put Thorlabs LCP35/M 60mm cage plate on M4 screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for 2in optic double-bore mount tap.
This entry is marked likely and comes from thorlabs.com.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Thorlabs LCP35/M 60mm 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 | 2in optic double-bore mount tap | Likely |
Fitment records and sources
2in optic double-bore mount tap
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Do not confuse metric mounting screws with the 1/4-20 or 3/8-16 tripod threads that cameras and clamps also carry.
- 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
- Camera rig/cage accessories (SmallRig, Wooden Camera/Metabones) frequently mix M4 structural screws with 1/4-20 and 3/8-16 imperial mounting points on the same product — verify which specific fastener a manual is referencing before ordering replacements.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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Devices whose records share a thread with Thorlabs LCP35/M 60mm cage plate, closest length match first.
- Glock Gen6 optic-ready slide also M4
- Astromania finder scope dovetail base also M4
- Thorlabs CPMA4/M snap-on 30mm cage bracket also M4
- Thorlabs LCPMA4/M 60mm cage bracket also M4
- Thorlabs QM1/M kinematic flexure mount also M4
- Thorlabs KM100CP/M kinematic mirror mount also M4
- Geissele Super Precision Optic Mount for Aimpoint CompM4 also M4
- Thorlabs FBTB/M kinematic mount for 5mm cube optics also M4
Questions about Thorlabs LCP35/M 60mm cage plate screws
- What size screw does Thorlabs LCP35/M 60mm cage plate use?
- M4 for 2in optic double-bore mount tap.
- How long are the screws in Thorlabs LCP35/M 60mm 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 LCP35/M 60mm 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.