GoPro thumbscrew/nut (scope mount project) screw size
M5 · 18 mm long
If you are replacing a screw on GoPro thumbscrew/nut (scope mount project), the thread is M5, 18 mm long.
Where it is used: photographed and measured M5-0.8 thumbscrew and matching nut used on GoPro mount hardware; screw length 18mm.
Head and drive, as the source states them: thumb screw (knurled) head.
This entry is marked confirmed and comes from airsoftspecops.com.
An M5 screw is 5 mm in diameter with a 0.8 mm pitch, tapped with a 4.2 mm drill; imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
GoPro thumbscrew/nut (scope mount project) 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 | 18 mm | 0.8 mm | Thumb screw (knurled) | not stated | Photographed and measured M5-0.8 thumbscrew and matching nut used on GoPro mount hardware; screw length 18mm | Confirmed |
Fitment records and sources
Photographed and measured M5-0.8 thumbscrew and matching nut used on GoPro mount hardware; screw length 18mm
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
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 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: for thumb screw (knurled) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The record states 18 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- 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
- GoPro's mounting thumbscrew (M5x0.8) is dimensionally very close to the imperial 10-32 screw, which can cause cross-threading if the wrong standard replacement is sourced.
- GoPro also uses M5 for its classic two-prong mount thumbscrew and buckle system, while smaller GoPro chassis screws are commonly Torx-driven without a confirmed metric thread in available sources — don't conflate the mount thumbscrew size with internal chassis screws.
More in Cameras & Optics
1.25" eyepiece/diagonal/SCT visual back thumb screwAimpoint Comp M4 / M4s LRP & TNP mountAimpoint Micro T-1/T-2/H-1/H-2 standard mountAimpoint Micro T-1/T-2/H-1/H-2 standard mount screwAimpoint SM-2001/2007 Micro T1/T2 mountAirsoft red dot sight mounting screw set (Laylax/Quintes Sence)Airsoft/firearm red-dot sight optic mounting screws (Vortex Viper, Swampfox patterns)Alpine and touring ski bindings (Binding Freedom inserts)Arca-style quick-release plateARRI plate for Sony VENICE 1/2Artesky 340mm Vixen Dovetail BarAstromania finder scope dovetail base
Browse all 278 in Cameras & Optics →The same screw also fits
Devices whose records share a thread with GoPro thumbscrew/nut (scope mount project), closest length match first.
- GoPro HERO mount thumbscrew also M5 × 18 mm
- GoPro HERO action-camera mount thumbscrew/buckle system also M5 × 18 mm
- Prusa i3 MK3S/MK4 frame and Y-rod holders also M5 × 18 mm
- Kick scooter clamp and folding hardware also M5 × 18 mm
- ABB ACS580 motor terminal box / cable glands also M5 × 18 mm
- EcoFlow Power Kits Power Hub wall/RV mounting hardware also M5 × 18 mm
- Voron 2.4 bed extrusions also M5 × 18 mm
- E-scooter fenders & kickstands also M5 × 18 mm
Questions about GoPro thumbscrew/nut (scope mount project) screws
- What size screw does GoPro thumbscrew/nut (scope mount project) use?
- M5 × 18 mm for photographed and measured M5-0.8 thumbscrew and matching nut used on GoPro mount hardware; screw length 18mm.
- How long are the screws in GoPro thumbscrew/nut (scope mount project)?
- The record gives 18 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 GoPro thumbscrew/nut (scope mount project)?
- 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.