Raspberry Pi Compute Module 4 carrier/IO board screw size
M2.5 · 5 to 11 mm long
The screws used on Raspberry Pi Compute Module 4 carrier/IO board are M2.5 in lengths from 5 to 11 mm.
The record covers CM4 carriers reuse the Pi-standard M2.5 standoff spacing.
This entry is marked reported and comes from pololu.com.
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 Compute Module 4 carrier/IO board 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 | 5–11 mm | 0.45 mm | not stated | not stated | CM4 carriers reuse the Pi-standard M2.5 standoff spacing | Reported |
Fitment records and sources
CM4 carriers reuse the Pi-standard M2.5 standoff spacing
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
- 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.
- The records span 5–11 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- Projector optics and fan screws often step down to M2.5 while the outer covers use M3 - do not reuse cover screws inside the light engine.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
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.
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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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Devices whose records share a thread with Raspberry Pi Compute Module 4 carrier/IO board, closest length match first.
- Raspberry Pi Zero mounting holes also M2.5 × 5–6 mm
- Raspberry Pi HAT standoffs also M2.5 × 6–11 mm
- PCB standoffs for compact electronics also M2.5 × 5–11 mm
- Raspberry Pi nylon standoff packs also M2.5 × 6 mm
- Raspberry Pi 4 / 5 mounting holes also M2.5 × 5–11 mm
- micro:bit enclosure mounting also M2.5 × 5–6 mm
- Voron StealthBurner toolhead with Dragon hotend also M2.5 × 8 mm
- NVIDIA Jetson Nano carrier board also M2.5 × 6–8 mm
Questions about Raspberry Pi Compute Module 4 carrier/IO board screws
- What size screw does Raspberry Pi Compute Module 4 carrier/IO board use?
- M2.5 × 5–11 mm for CM4 carriers reuse the Pi-standard M2.5 standoff spacing.
- How long are the screws in Raspberry Pi Compute Module 4 carrier/IO board?
- The records range from 5 to 11 mm depending on the position, so match each screw to its own hole.
- 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 Compute Module 4 carrier/IO board?
- 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.
- Where can I buy replacement screws for Raspberry Pi Compute Module 4 carrier/IO board?
- TechSpareWarehouse (our own store) lists M2.5 x 5mm, M2.5 x 6mm and M2.5 x 8mm, which match lengths in the records above.