Shield Sights Optic Ready (MOS) Mount screw size
M4 · length not stated in the sources
Our records put Shield Sights Optic Ready (MOS) Mount on M4 screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for manufacturer's recommended screw torque table explicitly lists 'M4 Screw Torque - 2Nm' alongside M3 for the mount's fixing screws.
This entry is marked confirmed and comes from shieldsights.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.
Shield Sights Optic Ready (MOS) Mount screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | 2 Nm | Manufacturer's recommended screw torque table explicitly lists 'M4 Screw Torque - 2Nm' alongside M3 for the mount's fixing screws | Confirmed |
Fitment records and sources
Manufacturer's recommended screw torque table explicitly lists 'M4 Screw Torque - 2Nm' alongside M3 for the mount's fixing screws
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.
Common mix-ups with M4
- Manual gives torque only, not screw length/drive type — verify physically before sourcing replacements.
- Archery bow sights (NYTRX, Tetra, Engage) use imperial #10-24 screws — '10-24' is not a metric callout.
More in Cameras & Optics
The same screw also fits
Devices whose records share a thread with Shield Sights Optic Ready (MOS) Mount, closest length match first.
- DJI RS upper quick-release plate also M4
- Cognex In-Sight 9000 machine vision system also M4
- Newport M-SP-2 / M-SP-4 optical posts also M4
- Christie HS / Jazz Series UST lens bracket also M4
- Newport M-SP-4 optical post also M4
- Dashcam / action-cam suction mount ball joint also M4
- Telescope eyepiece fixing set-screw also M4
- Wimberley AP-502 lens foot plate also M4
Questions about Shield Sights Optic Ready (MOS) Mount screws
- What size screw does Shield Sights Optic Ready (MOS) Mount use?
- M4 for manufacturer's recommended screw torque table explicitly lists 'M4 Screw Torque - 2Nm' alongside M3 for the mount's fixing screws.
- How long are the screws in Shield Sights Optic Ready (MOS) Mount?
- 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 Shield Sights Optic Ready (MOS) Mount?
- 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.
- How tight should the M4 screw on Shield Sights Optic Ready (MOS) Mount be?
- The source gives 2 Nm for manufacturer's recommended screw torque table explicitly lists 'M4 Screw Torque - 2Nm' alongside M3 for the mount's fixing screws.