RatRig V-Core 3.1 (200x200) screw size
M3 · 12 mm long
The screws used on RatRig V-Core 3.1 (200x200) are M3, 12 mm long.
There are 2 separate fitment records for it, including linear rail mounting to extrusion (28 screws) (M3) and 3030 T-nut screws for linear rail mounting (28 off) (M3).
2 of the 2 records are marked confirmed, drawn from 2 sources (wiki.ratrig.com V-Core 3.1 Linear Rails guide and wiki.ratrig.com).
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.
RatRig V-Core 3.1 (200x200) 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 | 12 mm | 0.5 mm | not stated | not stated | linear rail mounting to extrusion (28 screws) | Confirmed |
| M3 | 12 mm | 0.5 mm | not stated | not stated | 3030 T-nut screws for linear rail mounting (28 off) | Confirmed |
Fitment records and sources
linear rail mounting to extrusion (28 screws)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
3030 T-nut screws for linear rail mounting (28 off)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 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: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The record states 12 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
- DIN-rail terminal blocks are near-universally M3 across Dinkle, TE, Omron and RND, but torque differs (0.5-0.8 Nm) — over-torquing an M3 terminal screw strips it instantly.
- 2020 extrusion T-nuts come in M3/M4/M5 and are not interchangeable — M3 is accessory-only, M5 is structural.
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.
-
M3 x 12mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
$6.49 -
M3 x 12mm Phillips Wafer Head Screw for Electric Scooter LCD Dashboard - Single Replacement Black
$0.10 each · min. 50
-
M3 x 12mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
$0.10 each · min. 50
More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with RatRig V-Core 3.1 (200x200), closest length match first.
- FDM hotend and extruder mounts (general) also M3 × 12 mm
- Voron 2.4 3D printer also M3 × 12 mm
- Ender 3 V2 hotend and hotend cover also M3 × 12 mm
- NEMA 17 stepper motor mounting also M3 × 12 mm
- Ultimaker Original heated bed / Z-stage upgrade kit also M3 × 12 mm
- Prusa MK4 Nextruder also M3 × 12 mm
- Voron Stealthburner toolhead also M3 × 12 mm
- Bambu Lab X1 / P1 / A1 frame and toolhead also M3 × 12 mm
Questions about RatRig V-Core 3.1 (200x200) screws
- What size screw does RatRig V-Core 3.1 (200x200) use?
- M3 × 12 mm for linear rail mounting to extrusion (28 screws); M3 × 12 mm for 3030 T-nut screws for linear rail mounting (28 off).
- How long are the screws in RatRig V-Core 3.1 (200x200)?
- The record gives 12 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 RatRig V-Core 3.1 (200x200)?
- 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 RatRig V-Core 3.1 (200x200)?
- TechSpareWarehouse (our own store) lists M3 x 12mm, which matches the length in the records above.