Avid CNC Laser Kit screw size
M4 / M6 · 6 to 16 mm long
Our records put Avid CNC Laser Kit on M4 and M6 screws in lengths from 6 to 16 mm.
There are 2 separate fitment records for it, including assembly instructions call out M4x16 (SHC), M4x6 (SHC) alignment screws, and an M4 grease (M4) and M6x16 (SHC) screw used to attach the rail assembly, tightened with a 5mm allen wrench (M6).
Head and drive, as the sources state them: Hex socket (Allen) drive.
2 of the 2 records are marked confirmed, drawn from 1 source (avidcnc.com).
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Avid CNC Laser 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 |
|---|---|---|---|---|---|---|
| M4 | 6–16 mm | 0.7 mm | not stated | not stated | Assembly instructions call out M4x16 (SHC), M4x6 (SHC) alignment screws, and an M4 grease fitting threaded into the linear bearing block | Confirmed |
| M6 | 16 mm | 1 mm | not stated | Hex socket (Allen) | M6x16 (SHC) screw used to attach the rail assembly, tightened with a 5mm allen wrench | Confirmed |
Fitment records and sources
Assembly instructions call out M4x16 (SHC), M4x6 (SHC) alignment screws, and an M4 grease fitting threaded into the linear bearing block
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
M6x16 (SHC) screw used to attach the rail assembly, tightened with a 5mm allen wrench
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 M4 screw measures about 4 mm with calipers (usually a hair under). This device also uses M6, so measure each screw rather than assuming they match.
- Pitch: 0.7 mm from one thread crest to the next (14.29 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 6–16 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Hex socket (Allen) drive. For comparison, standard M4 heads take PH2 (Phillips) or T20 (Torx), or a 3 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4 / M6
- There is no single standard Picatinny/rail screw size; makers use metric M3/M4 and imperial 6-48 or 8-40 interchangeably. Always measure the existing screw.
- 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).
- Rack hole threads vary: 10-32 and 12-24 are still common in US racks alongside M6 - check the rail before buying.
- Small wind turbine literature frequently quotes torque or Allen-key size without a thread size; only callouts with an explicit 'M' designation were kept.
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.
-
M6 x 16mm Black Wafer Head Rack Screws for Rittal DK 7094.100 / 7094.110 / 7094.140 19-inch Rack – 20-Pack Replacement
$8.99Choose size -
M6 x 16mm Black Wafer Head Awning & Box Screws for Thule Awning 326 / 327 / 328, Conduit Box 317 & Xpedition 820 / 821 (50333) – 8-Pack Replacement
$6.99Choose size
More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with Avid CNC Laser Kit, closest length match first.
- 3D printer hotend to X-carriage also M4 × 10–16 mm
- Creality K1/Ender extrusion corner brackets also M4 × 8–16 mm
- Prusa i3 MK3S/MK4 heatbed and frame also M4 × 6–16 mm
- 3030/4040 extrusion end tap also M6 × 16 mm
- 3D printer & CNC enclosures also M4 × 8–16 mm
- Carbide3D Shapeoko 5 Pro CNC router also M4 × 6–16 mm
- 3030 extrusion T-nuts (heavy duty) also M6 × 16 mm
- Makeblock mBot Neo/mBot2 assembly kit also M4 × 8–16 mm
Questions about Avid CNC Laser Kit screws
- What size screw does Avid CNC Laser Kit use?
- M4 × 6–16 mm for assembly instructions call out M4x16 (SHC), M4x6 (SHC) alignment screws, and an M4 grease fitting threaded into the linear bearing block; M6 × 16 mm for M6x16 (SHC) screw used to attach the rail assembly, tightened with a 5mm allen wrench.
- How long are the screws in Avid CNC Laser Kit?
- The records range from 6 to 16 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for Avid CNC Laser Kit?
- The source lists a Hex socket (Allen) drive. Standard M4 heads otherwise take PH2 (Phillips) or T20 (Torx), or a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.