CNC router spindle clamp screw size
M5 · 16 to 25 mm long
CNC router spindle clamp takes M5 metric screws in lengths from 16 to 25 mm.
It is listed for clamps the spindle collar to the Z gantry.
This entry is marked reported and comes from openbuilds.com.
For reference, M5 is 5 mm across the threads at 0.8 mm pitch. The imperial size people confuse it with: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
CNC router spindle clamp 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 | 16–25 mm | 0.8 mm | not stated | not stated | clamps the spindle collar to the Z gantry | Reported |
Fitment records and sources
clamps the spindle collar to the Z gantry
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 16–25 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard 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
- Truss and stage-light clamps use M8 or M10 bolts depending on tube diameter — larger than anything in this database, so don't substitute an M6.
- M5x0.8 is the de facto universal bike thread — confirm 0.8mm pitch before threading into carbon or alloy bosses.
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Devices whose records share a thread with CNC router spindle clamp, closest length match first.
- X-Carve / Shapeoko-style OpenBuilds clone kits also M5 × 16 mm
- Prusa frame-to-extrusion joints also M5 × 16 mm
- OpenBuilds C-Beam Machine also M5 × 25 mm
- NEMA 23 stepper motor face also M5 × 16 mm
- 2020 extrusion T-nuts (standard) also M5 × 16–20 mm
- Voron 2.4 frame corner brackets also M5 × 16–25 mm
- Prusa i3 MK3S/MK4 frame and Y-rod holders also M5 × 16–25 mm
- Voron 2.4 bed extrusions also M5 × 16–25 mm
Questions about CNC router spindle clamp screws
- What size screw does CNC router spindle clamp use?
- M5 × 16–25 mm for clamps the spindle collar to the Z gantry.
- How long are the screws in CNC router spindle clamp?
- The records range from 16 to 25 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 CNC router spindle clamp?
- 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.