Third-party Raspberry Pi cases & HAT stacks screw size
M3 · 4 to 11 mm long
If you are replacing a screw on Third-party Raspberry Pi cases & HAT stacks, the thread is M3 in lengths from 4 to 11 mm.
It is listed for many redesign around M3 standoffs for easier sourcing (the board itself is M2.5).
This entry is marked reported and comes from quorten.github.io.
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Third-party Raspberry Pi cases & HAT stacks 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 |
|---|---|---|---|---|---|---|
| M3 | 4–11 mm | 0.5 mm | not stated | not stated | many redesign around M3 standoffs for easier sourcing (the board itself is M2.5) | Reported |
Fitment records and sources
many redesign around M3 standoffs for easier sourcing (the board itself is M2.5)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 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 4–11 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- GoPro's own official Dive Housing user guide does not itself state a metric screw size for the housing body; only third-party accessory manufacturer (INON) manuals explicitly cite M6 screws for their add-on arms/adapters attaching to the housing.
- PC cases mix M3 (fans, optical and 2.5in drives) with imperial 6-32 (3.5in drives, motherboard standoffs) - don't force one into the other.
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.
-
M3 x 4mm Phillips Wafer Head Screws for 2.5 SATA SSD Mounting 10-Pack
$4.99 -
M3 x 4mm Screws for Installing SSD into Synology NAS 10-Pack
$4.99 -
M3 x 5mm Phillips Wafer Head Screw for Electronics & Project Box Repair - Pack of 50 Black
$4.79 each · min. 2
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M3 x 6mm Replacement Screws for XLR Audio Connectors Phillips Wafer Head 50-Pack
$4.99 -
M3 x 6mm Phillips Wafer Head Carbon Steel Machine Screws for XLR Audio Connectors | 50-Pack (Black)
$4.99
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M3 x 4mm Phillips Wafer Head Screws for HDD Caddy Bracket 10-Pack
$4.99 -
M3 x 4mm Phillips Wafer Head Screws for SSD Hard Drive 10-Pack Black
$4.99 -
M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 100-Pack for RC & 3D Printers
$9.99
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Devices whose records share a thread with Third-party Raspberry Pi cases & HAT stacks, closest length match first.
- Takachi RPI aluminium Raspberry Pi case also M3 × 4 mm
- Hotends & heat breaks (E3D and clones) also M3 × 4–10 mm
- Star Micronics mPOP under-counter mount (CM-POP1) also M3 × 8 mm
- Pumpkin SUPERNOVA 6U CubeSat Structure Kit also M3 × 8 mm
- Fluke 117 multimeter also M3 × 6 mm
- Floyd Rose locking tremolo saddles also M3 × 8 mm
- Backscatter FLIP3.1 underwater filter frame screws (2x) also M3 × 8 mm
- Wimberley AP-503 replacement foot also M3 × 6 mm
Questions about Third-party Raspberry Pi cases & HAT stacks screws
- What size screw does Third-party Raspberry Pi cases & HAT stacks use?
- M3 × 4–11 mm for many redesign around M3 standoffs for easier sourcing (the board itself is M2.5).
- How long are the screws in Third-party Raspberry Pi cases & HAT stacks?
- The records range from 4 to 11 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Third-party Raspberry Pi cases & HAT stacks?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Third-party Raspberry Pi cases & HAT stacks?
- TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.