Thorlabs LCPMA4/M 60mm cage bracket screw size
M4 · length not stated in the sources
Thorlabs LCPMA4/M 60mm cage bracket takes M4 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for M4 tap for 60mm cage bracket post mounting.
This entry is marked confirmed and comes from thorlabs.com.
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Thorlabs LCPMA4/M 60mm cage bracket 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 | M4 tap for 60mm cage bracket post mounting | Confirmed |
Fitment records and sources
M4 tap for 60mm cage bracket post mounting
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 LCPMA4/M 60mm cage bracket, closest length match first.
- Thorlabs CPMA4/M snap-on 30mm cage bracket also M4
- Astromania finder scope dovetail base also M4
- Glock Gen6 optic-ready slide also M4
- Thorlabs LCP35/M 60mm cage plate also M4
- Geissele Super Precision Optic Mount for Aimpoint CompM4 also M4
- Thorlabs QM1/M kinematic flexure mount also M4
- Thorlabs KM100CP/M kinematic mirror mount also M4
- Newport M-HM-2 edge-grip filter mount also M4
Questions about Thorlabs LCPMA4/M 60mm cage bracket screws
- What size screw does Thorlabs LCPMA4/M 60mm cage bracket use?
- M4 for M4 tap for 60mm cage bracket post mounting.
- How long are the screws in Thorlabs LCPMA4/M 60mm cage bracket?
- 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 LCPMA4/M 60mm cage bracket?
- 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.