Prusa frame-to-extrusion joints screw size
M5 · 12 to 16 mm long
The screws used on Prusa frame-to-extrusion joints are M5 in lengths from 12 to 16 mm.
It is listed for frame corner brackets into aluminium extrusion.
This entry is marked confirmed and comes from help.prusa3d.com.
M5 means a 5 mm nominal diameter with a 0.8 mm thread pitch. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Prusa frame-to-extrusion joints 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 |
|---|---|---|---|---|---|---|
| M5 | 12–16 mm | 0.8 mm | not stated | not stated | frame corner brackets into aluminium extrusion | Confirmed |
Fitment records and sources
frame corner brackets into aluminium extrusion
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
- Diameter: across the threads an M5 screw measures about 5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.8 mm from one thread crest to the next (12.5 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 12–16 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M5 heads take PH2 for Phillips and T25 for Torx, and a 4 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 M5 is about 4.0-6.0 N·m into metal threads and 1.5-2.5 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M5
- 2020 extrusion end-tap holes vary between 4.2mm (M5) and 5mm (M6) core depending on manufacturer — always measure before tapping.
- M5x0.8 is the de facto universal bike thread — confirm 0.8mm pitch before threading into carbon or alloy bosses.
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 Prusa frame-to-extrusion joints, closest length match first.
- NEMA 23 stepper motor face also M5 × 12–16 mm
- Husqvarna Automower 305 / 308 robotic mower also M5 × 12 mm
- Voron 2.4 frame corner brackets also M5 × 12–16 mm
- 2020 extrusion T-nuts (standard) also M5 × 12–16 mm
- CNC router spindle clamp also M5 × 16 mm
- X-Carve / Shapeoko-style OpenBuilds clone kits also M5 × 12–16 mm
- 2040 extrusion T-nuts also M5 × 12–16 mm
- Voron 2.4 / Trident also M5 × 12–16 mm
Questions about Prusa frame-to-extrusion joints screws
- What size screw does Prusa frame-to-extrusion joints use?
- M5 × 12–16 mm for frame corner brackets into aluminium extrusion.
- How long are the screws in Prusa frame-to-extrusion joints?
- The records range from 12 to 16 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M5 screw?
- 0.8 mm (coarse), which is the standard pitch for M5 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 4.2 mm and the normal clearance hole is 5.5 mm.
- What screwdriver do I need for Prusa frame-to-extrusion joints?
- The sources do not name the drive. For M5, Phillips heads normally take PH2 and Torx heads T25; socket heads take a 4 mm hex key.
- Can I use an imperial screw instead of M5?
- No. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing. Use a true M5 screw so it does not cross-thread or strip the hole.