Raspberry Pi HAT stacking (Pololu / Adafruit) screw size
M2.5 · 6 to 11 mm long
Our records put Raspberry Pi HAT stacking (Pololu / Adafruit) on M2.5 screws in lengths from 6 to 11 mm.
Where it is used: male-female standoffs for stacking HATs and expansion boards.
This entry is marked confirmed 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 HAT stacking (Pololu / Adafruit) 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 | 6–11 mm | 0.45 mm | not stated | not stated | male-female standoffs for stacking HATs and expansion boards | Confirmed |
Fitment records and sources
male-female standoffs for stacking HATs and expansion boards
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- If several screws hold the same part, check that they are all the same length before assuming they are.
- 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 6–11 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
- 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.
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M2.5 x 8mm Screws for Retevis RT27 Radio Belt Clip 10-Pack Black Phillips
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M2.5 x 8mm Screws for Raspberry Pi 5 Case and PoE HAT 10-Pack Black
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M2.5 x 10mm Phillips Wafer Head Screw for Turntable Cartridge Headshell Mount - Pack of 50 Black
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M2.5 x 10mm Phillips Wafer Head Screw for ASUS TUF Gaming A15/F15 Laptop Repair - Single Replacement Black
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25x M2.5 x 8mm Phillips Screws for Acer Nitro 5 LCD Hinge Assembly
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M2.5 x 8mm Black Wafer Head Screws for Lenovo ThinkPad X131e Chromebook Palmrest Replacement – 10-Pack Black
$4.99Choose size
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Devices whose records share a thread with Raspberry Pi HAT stacking (Pololu / Adafruit), closest length match first.
- TEKTELIC Kona Photon Gen-2 LoRaWAN gateway also M2.5 × 8 mm
- Motorola APX 5000 / APX 6000 portable radio also M2.5 × 7–11 mm
- Backscatter FLIP3.1 underwater flip-frame retaining screw also M2.5 × 10 mm
- Acer Aspire / Swift also M2.5 × 6 mm
- Raspberry Pi 3B / 4B / 5 / Zero 2 standoff kits also M2.5 × 6–11 mm
- Acer TravelMate 7730 also M2.5 × 6.5 mm
- Lenovo ThinkPad P50 also M2.5 × 8 mm
- Lenovo ideapad 320E-15IKB also M2.5 × 7 mm
Questions about Raspberry Pi HAT stacking (Pololu / Adafruit) screws
- What size screw does Raspberry Pi HAT stacking (Pololu / Adafruit) use?
- M2.5 × 6–11 mm for male-female standoffs for stacking HATs and expansion boards.
- How long are the screws in Raspberry Pi HAT stacking (Pololu / Adafruit)?
- The records range from 6 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 HAT stacking (Pololu / Adafruit)?
- 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 stacking (Pololu / Adafruit)?
- TechSpareWarehouse (our own store) lists M2.5 x 6mm, M2.5 x 8mm and M2.5 x 10mm, which match lengths in the records above.