Raspberry Pi HAT mounting kit screw size
M2.5 · 11 mm long
The screws used on Raspberry Pi HAT mounting kit are M2.5, 11 mm long.
It is listed for M2.5 x 11mm female-female spacers with M2.5 bolts securing HAT PCB to Pi board.
This entry is marked confirmed and comes from thepihut.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 HAT mounting kit 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 | M2.5 x 11mm female-female spacers with M2.5 bolts securing HAT PCB to Pi board | Confirmed |
Fitment records and sources
M2.5 x 11mm female-female spacers with M2.5 bolts securing HAT PCB to Pi board
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- 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 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
- 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.
More in Electronics, Racks & Enclosures
The same screw also fits
Devices whose records share a thread with Raspberry Pi HAT mounting kit, closest length match first.
- 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
- Raspberry Pi HAT+ specification also M2.5 × 11 mm
- HP ProBook 6555b also M2.5 × 11 mm
- HP 250 G6 also M2.5 × 11 mm
- HP ProBook 6550b also M2.5 × 11 mm
Questions about Raspberry Pi HAT mounting kit screws
- What size screw does Raspberry Pi HAT mounting kit use?
- M2.5 × 11 mm for M2.5 x 11mm female-female spacers with M2.5 bolts securing HAT PCB to Pi board.
- How long are the screws in Raspberry Pi HAT mounting kit?
- 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 mounting kit?
- 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 mounting kit?
- TechSpareWarehouse (our own store) lists M2.5 x 11mm, which matches the length in the records above.