MGN12 linear rail screw size
M3 · 8 to 10 mm long
Our records put MGN12 linear rail on M3 screws in lengths from 8 to 10 mm.
Where it is used: countersunk bolts fixing the rail to a gantry plate.
Head and drive, as the source states them: flat / countersunk head.
This entry is marked reported and comes from hiwin.us.
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.
MGN12 linear rail 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 | 8–10 mm | 0.5 mm | Flat / countersunk | not stated | countersunk bolts fixing the rail to a gantry plate | Reported |
Fitment records and sources
countersunk bolts fixing the rail to a gantry plate
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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The records span 8–10 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
- Eurorack is a strong known case with two competing metric standards (M2.5 for Vector rails, M3 for Schroff/DIN-style and 3U threaded rails); mixing rail types requires matching screw/nut thread.
- Eurorack rail thread varies by manufacturer: some tapped M2.5, some M3 — not a single universal standard.
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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M3 x 8mm Phillips Wafer Head Screw for SLA Resin 3D Printer VAT Film - Single Replacement Black
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M3 x 10mm Phillips Wafer Head Screw for Sim Racing Wheel Paddle Shifter - Single Replacement Black
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M3 x 10mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
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M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 100-Pack for RC & 3D Printers
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M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 10-Pack for RC & 3D Printers
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M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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Devices whose records share a thread with MGN12 linear rail, closest length match first.
- 2020 extrusion T-nuts (light duty) also M3 × 8–10 mm
- NEMA 17 stepper motor face also M3 × 8–10 mm
- OpenBuilds gantry plate brackets also M3 × 8–10 mm
- VEX / Actobotics channel and gussets also M3 × 8–10 mm
- NEMA 17 stepper motor faceplate also M3 × 8 mm
- Prusa MINI frame and extruder also M3 × 10 mm
- MGN9 linear rail also M3 × 8 mm
- Bambu Lab X1 / P1 / A1 frame and toolhead also M3 × 8–10 mm
Questions about MGN12 linear rail screws
- What size screw does MGN12 linear rail use?
- M3 × 8–10 mm for countersunk bolts fixing the rail to a gantry plate.
- How long are the screws in MGN12 linear rail?
- The records range from 8 to 10 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 MGN12 linear rail?
- 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 MGN12 linear rail?
- TechSpareWarehouse (our own store) lists M3 x 8mm and M3 x 10mm, which match lengths in the records above.