Avid CNC router mount screw size
M5 · 20 mm long
If you are replacing a screw on Avid CNC router mount, the thread is M5, 20 mm long.
The record covers router body to base adapter, socket head cap screw.
Head and drive, as the source states them: socket cap head.
This entry is marked confirmed and comes from avidcnc.com.
An M5 screw is 5 mm in diameter with a 0.8 mm pitch, tapped with a 4.2 mm drill; imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Avid CNC router mount 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 | 20 mm | 0.8 mm | Socket cap | not stated | router body to base adapter, socket head cap screw | Confirmed |
Fitment records and sources
router body to base adapter, socket head cap screw
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
- 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: for socket cap screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The record states 20 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 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
- Sensor barrel sizes like M8, M12, M18 and M30 name the sensor body or connector diameter, not a mounting screw — check whether the M number is a body thread before buying screws.
- 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 Avid CNC router mount, closest length match first.
- OpenBuilds V-Slot T-nut bolts also M5 × 20 mm
- 2040 extrusion T-nuts also M5 × 20 mm
- 2020 T-slot hammer head bolts also M5 × 20 mm
- Voron 2.4 / Trident also M5 × 20 mm
- Printer / CNC extrusion frame bolts also M5 × 20 mm
- Prusa i3 MK3S/MK4 frame and Y-rod holders also M5 × 20 mm
- Voron 2.4 bed extrusions also M5 × 20 mm
- 2020 extrusion T-nuts (standard) also M5 × 20 mm
Questions about Avid CNC router mount screws
- What size screw does Avid CNC router mount use?
- M5 × 20 mm for router body to base adapter, socket head cap screw.
- How long are the screws in Avid CNC router mount?
- The record gives 20 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 Avid CNC router mount?
- 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.