Prusa i3 MK3S/MK4 (official fastener cheatsheet) screw size
M2 · 8 mm long
Prusa i3 MK3S/MK4 (official fastener cheatsheet) takes M2 metric screws, 8 mm long.
It is listed for M2x8 special screw listed in Prusa's official fastener identification cheatsheet.
This entry is marked confirmed and comes from prusa3d.com.
For reference, M2 is 2 mm across the threads at 0.4 mm pitch. The imperial size people confuse it with: #2-56 UNC (2.18 mm) is close but not interchangeable.
Prusa i3 MK3S/MK4 (official fastener cheatsheet) 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 |
|---|---|---|---|---|---|---|
| M2 | 8 mm | 0.4 mm | not stated | not stated | M2x8 special screw listed in Prusa's official fastener identification cheatsheet | Confirmed |
Fitment records and sources
M2x8 special screw listed in Prusa's official fastener identification cheatsheet
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
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 M2 screw measures about 2 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.4 mm from one thread crest to the next (25 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 record states 8 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source does not name the drive. Standard M2 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2
- Framework 13 and 16 use five thread families (M1.2 to M2.5) with overlapping lengths; buy Framework's own fastener kit rather than generic M2 screws.
- Prusa uses M2/M3/M4/M5 in dozens of specific lengths while Voron/LDO kits lean on M3 and M5 SHCS — a generic 'M3 bag' from one ecosystem often has the wrong head type for the other.
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.
-
M2 x 8mm Phillips Wafer Head Screw for Dell XPS 15 9560 Laptop Repair - Pack of 100 Black
$7.99 -
10x M2 x 8mm Phillips Screws for HP Fortis 14 G11 Chromebook Bottom Cover
$4.99 -
M2 x 8mm Phillips Wafer Head Screw for FPV Drone Build & Repair - Pack of 100 Black
$7.99 -
M2 x 8mm Phillips Wafer Head Screw for HP Fortis 14 G11 Chromebook Repair - Pack of 100 Black
$7.99
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Devices whose records share a thread with Prusa i3 MK3S/MK4 (official fastener cheatsheet), closest length match first.
- Actobotics servo horn / hub also M2 × 8 mm
- FPV flight controller stack 20x20mm also M2 × 8 mm
- Acer TravelMate 5230 also M2 × 8 mm
- Kenwood TK-8302 / TK-2302 / TK-2306 transceivers also M2 × 8 mm
- HP 13-4100 through 4199) also M2 × 8 mm
- HP nx8220 (nw8240 page id 462857; one guide covers all three) also M2 × 8 mm
- HP EliteBook 2740p also M2 × 8 mm
- Lenovo Chromebook S345-14AST also M2 × 8 mm
Questions about Prusa i3 MK3S/MK4 (official fastener cheatsheet) screws
- What size screw does Prusa i3 MK3S/MK4 (official fastener cheatsheet) use?
- M2 × 8 mm for M2x8 special screw listed in Prusa's official fastener identification cheatsheet.
- How long are the screws in Prusa i3 MK3S/MK4 (official fastener cheatsheet)?
- The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for Prusa i3 MK3S/MK4 (official fastener cheatsheet)?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Prusa i3 MK3S/MK4 (official fastener cheatsheet)?
- TechSpareWarehouse (our own store) lists M2 x 8mm, which matches the length in the records above.