Airgun scope/rail mount replacement screws screw size
M3 · 10 mm long
If you are replacing a screw on Airgun scope/rail mount replacement screws, the thread is M3, 10 mm long.
Where it is used: ant-Supplies UK sells 'Replacement Rail and Scope Mount Screws - M3 M4 Metric Thread Torx' explicitly stating 'Thread type ~ metric (M3 or M4)' with 10mm thread length, for scope/rail mounts.
Head and drive, as the source states them: Torx drive.
This entry is marked confirmed and comes from ant-supplies.uk.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Airgun scope/rail mount replacement screws 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 |
|---|---|---|---|---|---|---|
| M3 | 10 mm | 0.5 mm | not stated | Torx | Ant-Supplies UK sells 'Replacement Rail and Scope Mount Screws - M3 M4 Metric Thread Torx' explicitly stating 'Thread type ~ metric (M3 or M4)' with 10mm thread length, for scope/rail mounts | Confirmed |
Fitment records and sources
Ant-Supplies UK sells 'Replacement Rail and Scope Mount Screws - M3 M4 Metric Thread Torx' explicitly stating 'Thread type ~ metric (M3 or M4)' with 10mm thread length, for scope/rail mounts
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- On vehicles and bikes, use the original strength class and finish; outdoor hardware is usually stainless or coated to resist corrosion.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 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.
- The record states 10 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source names a Torx drive. For comparison, standard M3 heads take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- Telescope thumbscrews are sold in a wide non-metric legacy range too (1/4-20, 8-32, 10-32 on many Meade/Celestron mounts), so metric M3/M4 fitment applies mainly to newer/international accessory ecosystems (SkyWatcher, generic 1.25" accessories) and should not be assumed universal.
- Eurorack is a strong known case with two competing metric standards (M2.5 for Vector rails, M3 for Schroff/DIN-style and 3U threaded rails); mixing rail types requires matching screw/nut thread.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
-
M3 x 10mm Phillips Wafer Head Screw for Sim Racing Wheel Paddle Shifter - Single Replacement Black
$0.10 each · min. 50
-
M3 x 10mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
$0.10 each · min. 50
-
M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
More in Vehicles, Marine & Mobility
The same screw also fits
Devices whose records share a thread with Airgun scope/rail mount replacement screws, closest length match first.
- E-scooter stem and controller housing also M3 × 10 mm
- Scope / rail mount base screws (small metric) also M3 × 10 mm
- Fishing reel handle retainer also M3 × 10 mm
- Bike computer out-front mount also M3 × 10 mm
- Tyco/Advanced MX1 fire panel loop card kit (FP0950) also M3 × 10 mm
- Fishing reel side plate / frame also M3 × 10 mm
- Prusa MK3S extruder also M3 × 10 mm
- Omron E3T ultracompact photoelectric sensor (used for conveyor/AGV object detection) also M3 × 10 mm
Questions about Airgun scope/rail mount replacement screws screws
- What size screw does Airgun scope/rail mount replacement screws use?
- M3 × 10 mm for ant-Supplies UK sells 'Replacement Rail and Scope Mount Screws - M3 M4 Metric Thread Torx' explicitly stating 'Thread type ~ metric (M3 or M4)' with 10mm thread length, for scope/rail mounts.
- How long are the screws in Airgun scope/rail mount replacement screws?
- The record gives 10 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Airgun scope/rail mount replacement screws?
- The source lists a Torx drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Airgun scope/rail mount replacement screws?
- TechSpareWarehouse (our own store) lists M3 x 10mm, which matches the length in the records above.