Geissele Super Precision Optic Mount for Aimpoint CompM4 screw size
M4 · length not stated in the sources
The screws used on Geissele Super Precision Optic Mount for Aimpoint CompM4 are M4. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: optic retaining screws, tightened with 4mm hex key.
Head and drive, as the source states them: Hex socket (Allen) drive.
This entry is marked reported and comes from opticsplanet.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.
Geissele Super Precision Optic Mount for Aimpoint CompM4 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 | Hex socket (Allen) | optic retaining screws, tightened with 4mm hex key | Reported |
Fitment records and sources
optic retaining screws, tightened with 4mm hex key
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 names a Hex socket (Allen) drive. For comparison, standard M4 heads take PH2 (Phillips) or T20 (Torx), or a 3 mm hex key.
- 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
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
More in Cameras & Optics
The same screw also fits
Devices whose records share a thread with Geissele Super Precision Optic Mount for Aimpoint CompM4, closest length match first.
- Thorlabs QM1/M kinematic flexure mount also M4
- Thorlabs KM100CP/M kinematic mirror mount also M4
- Thorlabs LCPMA4/M 60mm cage bracket also M4
- Astromania finder scope dovetail base also M4
- Thorlabs CPMA4/M snap-on 30mm cage bracket also M4
- Thorlabs LCP35/M 60mm cage plate also M4
- Glock Gen6 optic-ready slide also M4
- Optic/scope ring mounting screw manufactured to engineering drawing (fastener supplier drawing, generic optics mount hardware) also M4
Questions about Geissele Super Precision Optic Mount for Aimpoint CompM4 screws
- What size screw does Geissele Super Precision Optic Mount for Aimpoint CompM4 use?
- M4 for optic retaining screws, tightened with 4mm hex key.
- How long are the screws in Geissele Super Precision Optic Mount for Aimpoint CompM4?
- 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 Geissele Super Precision Optic Mount for Aimpoint CompM4?
- The source lists a Hex socket (Allen) drive. Standard M4 heads otherwise take PH2 (Phillips) or T20 (Torx), or 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.