Prusa i3 MK3S/MK4 frame and Y-rod holders screw size
M5 · 10 to 85 mm long
Our records put Prusa i3 MK3S/MK4 frame and Y-rod holders on M5 screws in lengths from 10 to 85 mm.
It is listed for M5x10, M5x16, M5x20 and M5x85 screws listed in the official Prusa cheatsheet.
This entry is marked confirmed and comes from 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 i3 MK3S/MK4 frame and Y-rod holders 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 | 10–85 mm | 0.8 mm | not stated | not stated | M5x10, M5x16, M5x20 and M5x85 screws listed in the official Prusa cheatsheet | Confirmed |
Fitment records and sources
M5x10, M5x16, M5x20 and M5x85 screws listed in the official Prusa cheatsheet
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
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 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 10–85 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
- 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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More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with Prusa i3 MK3S/MK4 frame and Y-rod holders, closest length match first.
- Voron 2.4 bed extrusions also M5 × 16–40 mm
- Robotiq 2F-85 / 2F-140 gripper also M5 × 25 mm
- Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system) also M5 × 45 mm
- 2020/2040 extrusion end tap also M5 × 10–16 mm
- Printer / CNC extrusion frame bolts also M5 × 10–25 mm
- 2040 extrusion T-nuts also M5 × 10–20 mm
- Shapeoko 5 Pro CNC router also M5 × 10 mm
- Voron 2.4 / Trident also M5 × 10–40 mm
Questions about Prusa i3 MK3S/MK4 frame and Y-rod holders screws
- What size screw does Prusa i3 MK3S/MK4 frame and Y-rod holders use?
- M5 × 10–85 mm for M5x10, M5x16, M5x20 and M5x85 screws listed in the official Prusa cheatsheet.
- How long are the screws in Prusa i3 MK3S/MK4 frame and Y-rod holders?
- The records range from 10 to 85 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 i3 MK3S/MK4 frame and Y-rod holders?
- 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.