Raspberry Pi HAT+ specification screw size
M2.5 · 11 mm long
Our records put Raspberry Pi HAT+ specification on M2.5 screws, 11 mm long.
Where it is used: HAT to Pi board standoff mounting holes.
This entry is marked confirmed and comes from pip-assets.raspberrypi.com.
For reference, M2.5 is 2.5 mm across the threads at 0.45 mm pitch. The imperial size people confuse it with: #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 HAT+ specification 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 | 11 mm | 0.45 mm | not stated | not stated | HAT to Pi board standoff mounting holes | Confirmed |
Fitment records and sources
HAT to Pi board standoff mounting holes
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
- 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 record states 11 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 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.
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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Devices whose records share a thread with Raspberry Pi HAT+ specification, closest length match first.
- Raspberry Pi HAT mounting kit also M2.5 × 11 mm
- NVG shroud / helmet bracket hardware (Gentex-style 3-hole) also M2.5 × 11 mm
- Wurth Elektronik WA-SPAIE plastic spacer stud also M2.5 × 11 mm
- Wurth Elektronik WA-SSTIE steel spacer stud also M2.5 × 11 mm
- Essentra MTNSP-M2.5-11-3 male-to-male standoff also M2.5 × 11 mm
- HP mt45 Mobile Thin Client also M2.5 × 11 mm
- HP 625 PCs also M2.5 × 11 mm
- HP Compaq 610 also M2.5 × 11 mm
Questions about Raspberry Pi HAT+ specification screws
- What size screw does Raspberry Pi HAT+ specification use?
- M2.5 × 11 mm for HAT to Pi board standoff mounting holes.
- How long are the screws in Raspberry Pi HAT+ specification?
- The record gives 11 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 HAT+ specification?
- 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 HAT+ specification?
- TechSpareWarehouse (our own store) lists M2.5 x 11mm, which matches the length in the records above.