Ultimaker Original heated bed / Z-stage upgrade kit screw size
M3 / M4 / M6 · 10 to 25 mm long
Our records put Ultimaker Original heated bed / Z-stage upgrade kit on M3, M4 and M6 screws in lengths from 10 to 25 mm.
There are 3 separate fitment records for it, including assembly manual specifies M3x25mm screws for frame mounting and M3x10mm screws for Z-stage (M3), 8 x M4x10 bolts used to secure bearings in the Z-stage assembly (M4) and M6 washer used with Knurled Nut Platform, springs and countersunk M3x20mm screws in the Z- (M6).
Head and drive, as the sources state them: flat / countersunk head.
3 of the 3 records are marked confirmed, drawn from 1 source (um-support-files.ultimaker.com).
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Ultimaker Original heated bed / Z-stage upgrade kit 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 | 10–25 mm | 0.5 mm | not stated | not stated | Assembly manual specifies M3x25mm screws for frame mounting and M3x10mm screws for Z-stage assembly, plus M3 nuts and M3 locknuts throughout the build | Confirmed |
| M4 | 10 mm | 0.7 mm | not stated | not stated | 8 x M4x10 bolts used to secure bearings in the Z-stage assembly | Confirmed |
| M6 | not stated | 1 mm | Flat / countersunk | not stated | M6 washer used with Knurled Nut Platform, springs and countersunk M3x20mm screws in the Z-stage buildwasher / flange face | Confirmed |
Fitment records and sources
Assembly manual specifies M3x25mm screws for frame mounting and M3x10mm screws for Z-stage assembly, plus M3 nuts and M3 locknuts throughout the build
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
8 x M4x10 bolts used to secure bearings in the Z-stage assembly
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
M6 washer used with Knurled Nut Platform, springs and countersunk M3x20mm screws in the Z-stage build
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
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). This device also uses M4 / M6, so measure each screw rather than assuming they match.
- 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 10–25 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 / M4 / M6
- Suunto dive computer service manuals reference strap pins and battery compartment springs but do not explicitly cite a metric screw thread size in the sections reviewed; do not infer M2/M2.5 fitment for Suunto dive computer straps without direct confirmation.
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
- 19-inch rack rails use three incompatible thread standards that share the same square hole: M6, 10-32 UNF and 12-24 UNC. Cage nuts for all of them look identical in a parts bin.
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 12mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
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M3 x 12mm Phillips Wafer Head Screw for Electric Scooter LCD Dashboard - Single Replacement Black
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M3 x 14mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
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M3 x 14mm Phillips Wafer Head Screw for 3D Printer Extruder Stepper Motor - Single Replacement Black
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M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
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M4 x 10mm Black Wafer Head Charging Port Screws for GOTRAX G3, G4, GMAX & GMAX Ultra – 10-Pack Replacement
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More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with Ultimaker Original heated bed / Z-stage upgrade kit, closest length match first.
- Inventables X-Carve 300W 24VDC spindle kit also M4 × 10 mm
- Voron Stealthburner toolhead also M3 × 10–16 mm
- Makeblock mBot Neo/mBot2 assembly kit also M4 × 10 mm
- Voron 2.4 electronics bay also M3 × 10 mm
- Prusa MK4 Nextruder also M3 × 10–25 mm
- Bambu Lab X1/P1 heatbed transport anchors also M3 × 20–23 mm
- InMoov open-source robot also M3 × 20 mm
- NEMA 17 stepper motor mounting also M3 × 10–14 mm
Questions about Ultimaker Original heated bed / Z-stage upgrade kit screws
- What size screw does Ultimaker Original heated bed / Z-stage upgrade kit use?
- M3 × 10–25 mm for assembly manual specifies M3x25mm screws for frame mounting and M3x10mm screws for Z-stage assembly, plus M3 nuts and M3 locknuts throughout the build; M4 × 10 mm for 8 x M4x10 bolts used to secure bearings in the Z-stage assembly; M6 for M6 washer used with Knurled Nut Platform, springs and countersunk M3x20mm screws in the Z-stage build.
- How long are the screws in Ultimaker Original heated bed / Z-stage upgrade kit?
- The records range from 10 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 Ultimaker Original heated bed / Z-stage upgrade kit?
- 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 Ultimaker Original heated bed / Z-stage upgrade kit?
- TechSpareWarehouse (our own store) lists M3 x 10mm, M3 x 12mm and M3 x 14mm, which match lengths in the records above.