Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system) screw size
M5 · 45 mm long
If you are replacing a screw on Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system), the thread is M5, 45 mm long.
The record covers product explicitly named 'Technic Compatible 45L THREADED M5 Metal Axle Bar Shaft' -- a metal drop-in axle for Technic-style beams with a real M5 external thread for locking/attachment.
This entry is marked confirmed and comes from metal-technic-parts.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.
Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system) 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 | 45 mm | 0.8 mm | not stated | not stated | Product explicitly named 'Technic Compatible 45L THREADED M5 Metal Axle Bar Shaft' -- a metal drop-in axle for Technic-style beams with a real M5 external thread for locking/attachment | Confirmed |
Fitment records and sources
Product explicitly named 'Technic Compatible 45L THREADED M5 Metal Axle Bar Shaft' -- a metal drop-in axle for Technic-style beams with a real M5 external thread for locking/attachment
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: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The record states 45 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
- This is a third-party/aftermarket metal component, not an official LEGO or LEGO Technic part; standard LEGO Technic axles are unthreaded plastic friction-fit rods.
- Ski and snowboard binding screws vary by brand and insert system (4x4, Channel, Tyrolia, Marker). Aftermarket suppliers standardise on M5/M6 but OEM screws can be a different pitch.
More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system), closest length match first.
- Prusa i3 MK3S/MK4 frame and Y-rod holders also M5 × 45 mm
- Makita 1806B planer also M5 × 45 mm
- Drum tension rod also M5 × 45 mm
- Raymarine Axiom 7/9/12 multifunction display also M5 × 45 mm
- DIN 965 / ISO 7046 countersunk Phillips screw also M5 × 45 mm
- DIN 912 socket-head cap screw also M5 × 45 mm
- Robotiq 2F-85 / 2F-140 gripper also M5
- 2020/2040 extrusion end tap also M5
Questions about Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system) screws
- What size screw does Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system) use?
- M5 × 45 mm for product explicitly named 'Technic Compatible 45L THREADED M5 Metal Axle Bar Shaft' -- a metal drop-in axle for Technic-style beams with a real M5 external thread for locking/attachment.
- How long are the screws in Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system)?
- The record gives 45 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 Metal Technic-compatible axle/shaft (LEGO Technic-style robotics building system)?
- 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.