Bondtech extruder primary drive gear (5mm bore) screw size
M3 · 2 mm long
Bondtech extruder primary drive gear (5mm bore) takes M3 metric screws, 2 mm long.
Where it is used: grub/set screw for drive gear.
Head and drive, as the source states them: set screw (headless) head.
This entry is marked confirmed and comes from test.bondtech.se.
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.
Bondtech extruder primary drive gear (5mm bore) 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 | 2 mm | 0.5 mm | Set screw (headless) | not stated | grub/set screw for drive gear | Confirmed |
Fitment records and sources
grub/set screw for drive gear
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: for set screw (headless) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The record states 2 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 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
- Grub screws (set screws) on sensor retainers are frequently M3 even when the surrounding housing uses M4/M5 fasteners — don't assume one thread size for a whole enclosure.
- M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.
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Devices whose records share a thread with Bondtech extruder primary drive gear (5mm bore), closest length match first.
- Slice Engineering Mosquito hotend also M3 × 2 mm
- HP EliteBook 2560p also M3 × 2 mm
- LED video wall cabinet bezel and bracket-link screws also M3 × 2 mm
- 2.5in SATA / SAS hard drives and SSDs (SFF-8201) also M3 × 2 mm
- Cognex In-Sight 8000/8200/8400 vision system also M3 × 2 mm
- Arduino shield stacking standoffs also M3
- Bambu Lab X1/P1/AMS spare screw kit also M3
- Robotiq low-profile gripper coupling also M3
Questions about Bondtech extruder primary drive gear (5mm bore) screws
- What size screw does Bondtech extruder primary drive gear (5mm bore) use?
- M3 × 2 mm for grub/set screw for drive gear.
- How long are the screws in Bondtech extruder primary drive gear (5mm bore)?
- The record gives 2 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 Bondtech extruder primary drive gear (5mm bore)?
- 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.