Arduino shield stacking standoffs screw size
M3 · 8 to 11 mm long
Arduino shield stacking standoffs takes M3 metric screws in lengths from 8 to 11 mm.
It is listed for adds rigidity when stacking shields.
This entry is marked reported and comes from docs.arduino.cc.
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Arduino shield stacking standoffs 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 | 8–11 mm | 0.5 mm | not stated | not stated | adds rigidity when stacking shields | Reported |
Fitment records and sources
adds rigidity when stacking shields
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Into printed plastic, the screw either self-taps or needs a heat-set insert; machine screws straight into plastic strip easily.
- 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 8–11 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
- Power-tool gearcase and clamshell screws are usually thread-forming (marked "ST") even when the parts list gives an M-size — a normal machine screw of the same size may not hold in the plastic boss.
- Intel's ATX and microATX specs never state a metric standoff thread; PC motherboard standoffs are usually imperial 6-32, and PC fan screws are commonly 6-32 self-tapping.
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 Arduino shield stacking standoffs, closest length match first.
- Bambu Lab X1/P1/AMS spare screw kit also M3 × 8–11 mm
- CNC / V-slot limit switches & sensors also M3 × 8–10 mm
- Voron StealthBurner toolhead (stock hotend) also M3 × 8 mm
- Voron 2.4 / Trident also M3 × 8–11 mm
- Voron 2.4 gantry and carriage hardware also M3 × 8–11 mm
- Bambu Lab X1 / P1 / A1 frame and toolhead also M3 × 8–11 mm
- MGN9 linear rail also M3 × 8 mm
- NEMA 17 stepper motor faceplate also M3 × 8 mm
Questions about Arduino shield stacking standoffs screws
- What size screw does Arduino shield stacking standoffs use?
- M3 × 8–11 mm for adds rigidity when stacking shields.
- How long are the screws in Arduino shield stacking standoffs?
- The records range from 8 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 Arduino shield stacking standoffs?
- 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 Arduino shield stacking standoffs?
- TechSpareWarehouse (our own store) lists M3 x 8mm and M3 x 10mm, which match lengths in the records above.