MTH Premier SD-70 (2-rail HO locomotive) screw size
M2 · length not stated in the sources
MTH Premier SD-70 (2-rail HO locomotive) takes M2 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: coupler mounting screw, M2 x 0.4 pitch.
This entry is marked reported and comes from shuntool.com.
For reference, M2 is 2 mm across the threads at 0.4 mm pitch. The imperial size people confuse it with: #2-56 UNC (2.18 mm) is close but not interchangeable.
MTH Premier SD-70 (2-rail HO locomotive) 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 |
|---|---|---|---|---|---|---|
| M2 | not stated | 0.4 mm | not stated | not stated | Coupler mounting screw, M2 x 0.4 pitch | Reported |
Fitment records and sources
Coupler mounting screw, M2 x 0.4 pitch
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- Frame and motor screws must not reach the motor windings; check the length against the motor's mounting depth.
- Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.4 mm from one thread crest to the next (25 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.
- Driver: the source does not name the drive. Standard M2 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2
- M2 (2.00mm, 0.4mm pitch) is NOT the same as #2-56 UNC (2.18mm) — close enough to cross-thread and strip if forced.
More in Drones, RC & Gimbals
The same screw also fits
Devices whose records share a thread with MTH Premier SD-70 (2-rail HO locomotive), closest length match first.
- Futaba micro servo self-tapping screw also M2
- Scaleauto SC-1629 nylon guide nut (1/24 slot car) also M2
- DJI Phantom GoPro-style under-body mount also M2
- Micro/whoop FPV drone motors also M2
- Nerf and toy blaster flywheel motor screws also M2
- Tamiya 3-piece front wheels also M2
- DJI Avata propellers also M2
- FPV brushless motors (NewBeeDrone etc.) also M2
Questions about MTH Premier SD-70 (2-rail HO locomotive) screws
- What size screw does MTH Premier SD-70 (2-rail HO locomotive) use?
- M2 for coupler mounting screw, M2 x 0.4 pitch.
- How long are the screws in MTH Premier SD-70 (2-rail HO locomotive)?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- What is the thread pitch of an M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for MTH Premier SD-70 (2-rail HO locomotive)?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.