Heated bed to Y-carriage screw size
M3 · 16 to 25 mm long
Heated bed to Y-carriage takes M3 metric screws in lengths from 16 to 25 mm.
Where it is used: bed mounting over levelling springs.
This entry is marked reported and comes from help.prusa3d.com.
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.
Heated bed to Y-carriage 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 | 16–25 mm | 0.5 mm | not stated | not stated | bed mounting over levelling springs | Reported |
Fitment records and sources
bed mounting over levelling springs
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 16–25 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
- Terminal-block clamp screws have manufacturer-specific torque values — over-tightening cracks the block or crushes the wire.
- DIN-rail terminal blocks are near-universally M3 across Dinkle, TE, Omron and RND, but torque differs (0.5-0.8 Nm) — over-torquing an M3 terminal screw strips it instantly.
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Devices whose records share a thread with Heated bed to Y-carriage, closest length match first.
- Bambu Lab X1/P1/AMS spare screw kit also M3 × 16–20 mm
- Bambu Lab X1 / P1 / A1 frame and toolhead also M3 × 16–25 mm
- Voron 2.4 / Trident also M3 × 16–25 mm
- Voron 2.4 gantry and carriage hardware also M3 × 16–25 mm
- 2020 extrusion T-nuts (light duty) also M3 × 16 mm
- OpenBuilds gantry plate brackets also M3 × 16 mm
- VEX / Actobotics channel and gussets also M3 × 16–25 mm
- Prusa MINI frame and extruder also M3 × 16–25 mm
Questions about Heated bed to Y-carriage screws
- What size screw does Heated bed to Y-carriage use?
- M3 × 16–25 mm for bed mounting over levelling springs.
- How long are the screws in Heated bed to Y-carriage?
- The records range from 16 to 25 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 Heated bed to Y-carriage?
- 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.