ISMS (Sweden) ISMS scope mount clamping screws (Torx T20) screw size
M5 · length not stated in the sources
ISMS (Sweden) ISMS scope mount clamping screws (Torx T20) takes M5 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for manual states M5 Tx20 clamping screws.
This entry is marked reported and comes from gunsmoke.eu.
For reference, M5 is 5 mm across the threads at 0.8 mm pitch. The imperial size people confuse it with: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
ISMS (Sweden) ISMS scope mount clamping screws (Torx T20) 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 |
|---|---|---|---|---|---|---|
| M5 | not stated | 0.8 mm | not stated | not stated | Manual states M5 Tx20 clamping screws | Reported |
Fitment records and sources
Manual states M5 Tx20 clamping screws
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
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 M5 screw measures about 5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.8 mm from one thread crest to the next (12.5 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 M5 heads take PH2 for Phillips and T25 for Torx, and a 4 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 M5 is about 4.0-6.0 N·m into metal threads and 1.5-2.5 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M5
- M5x0.8 is the de facto universal bike thread — confirm 0.8mm pitch before threading into carbon or alloy bosses.
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Devices whose records share a thread with ISMS (Sweden) ISMS scope mount clamping screws (Torx T20), closest length match first.
- GoPro HERO action camera mounting thumb screw also M5
- ScopeStuff nylon thumbscrew kit also M5
- Alpine and touring ski bindings (Binding Freedom inserts) also M5
- GoPro HERO action-camera mount thumbscrew/buckle system also M5
- Camera cage accessory arms also M5
- Orion 60mm dovetail finder bracket #05041 also M5
- GoPro (all standard mounts, Hero series) also M5
- Aimpoint Comp M4 / M4s LRP & TNP mount also M5
Questions about ISMS (Sweden) ISMS scope mount clamping screws (Torx T20) screws
- What size screw does ISMS (Sweden) ISMS scope mount clamping screws (Torx T20) use?
- M5 for manual states M5 Tx20 clamping screws.
- How long are the screws in ISMS (Sweden) ISMS scope mount clamping screws (Torx T20)?
- 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 M5 screw?
- 0.8 mm (coarse), which is the standard pitch for M5 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 4.2 mm and the normal clearance hole is 5.5 mm.
- What screwdriver do I need for ISMS (Sweden) ISMS scope mount clamping screws (Torx T20)?
- The sources do not name the drive. For M5, Phillips heads normally take PH2 and Torx heads T25; socket heads take a 4 mm hex key.
- Can I use an imperial screw instead of M5?
- No. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing. Use a true M5 screw so it does not cross-thread or strip the hole.