Raspberry Pi Model A/B mounting holes screw size
M2.5 · length not stated in the sources
The screws used on Raspberry Pi Model A/B mounting holes are M2.5. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for official mounting template: 2.9 mm holes sized for M2.5 screws.
This entry is marked confirmed and comes from raspberrypi-spy.co.uk.
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Raspberry Pi Model A/B mounting holes 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 |
|---|---|---|---|---|---|---|
| M2.5 | not stated | 0.45 mm | not stated | not stated | Official mounting template: 2.9 mm holes sized for M2.5 screws | Confirmed |
Fitment records and sources
Official mounting template: 2.9 mm holes sized for M2.5 screws
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Vibration loosens small screws on drones and RC models, so builders commonly add a drop of medium (blue) threadlocker on metal-to-metal joints — never on plastic.
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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 M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
- M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
More in Drones, RC & Gimbals
The same screw also fits
Devices whose records share a thread with Raspberry Pi Model A/B mounting holes, closest length match first.
- Mikado RC helicopter servo mounting screw also M2.5
- MKS servo 6mm metal double horn also M2.5
- Axial Racing crawler/buggy kits also M2.5
- DJI Agras T30 agricultural spray drone motor fixing base also M2.5
- Raspberry Pi Model B+/2/3/4 also M2.5
- Hitec / Futaba RC servo horn also M2.5
- RC servo horn retaining screw (Hitec/Futaba style) also M2.5
- Traxxas E-Revo (TRA2523/TRX3229) also M2.5
Questions about Raspberry Pi Model A/B mounting holes screws
- What size screw does Raspberry Pi Model A/B mounting holes use?
- M2.5 for official mounting template: 2.9 mm holes sized for M2.5 screws.
- How long are the screws in Raspberry Pi Model A/B mounting holes?
- 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 M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Raspberry Pi Model A/B mounting holes?
- The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.