Kadee HO-scale coupler mounting screw size
M2 · 3 to 5 mm long
Our records put Kadee HO-scale coupler mounting on M2 screws in lengths from 3 to 5 mm.
The record covers small machine screw fixing the coupler box to the underframe.
This entry is marked reported and comes from kadee.com.
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Kadee HO-scale coupler mounting 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 | 3–5 mm | 0.4 mm | not stated | not stated | Small machine screw fixing the coupler box to the underframe | Reported |
Fitment records and sources
Small machine screw fixing the coupler box to the underframe
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- Check the strength class stamped on the head (8.8, 10.9, A2-70) and replace like for like.
- 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.
- The records span 3–5 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- Packaging/labeling equipment manuals (e.g., cab print-and-apply applicators) mix M2 through M6 fasteners across a single machine for very different assemblies (sensors vs. frame vs. drive) — do not generalize one thread size to 'the machine' as a whole; cite the specific subassembly.
- 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.
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.
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Devices whose records share a thread with Kadee HO-scale coupler mounting, closest length match first.
- Tofu60 mechanical keyboard case also M2 × 4–5 mm
- KBDfans Tofu60 case also M2 × 4 mm
- HP 530 also M2 × 3 mm
- Dell Inspiron 16 7610 also M2 × 3 mm
- Lenovo ThinkPad E31 also M2 × 3 mm
- Lenovo ThinkPad 600 also M2 × 3 mm
- HP Compaq 511 also M2 × 3 mm
- Dell 15 DC15250 also M2 × 3 mm
Questions about Kadee HO-scale coupler mounting screws
- What size screw does Kadee HO-scale coupler mounting use?
- M2 × 3–5 mm for small machine screw fixing the coupler box to the underframe.
- How long are the screws in Kadee HO-scale coupler mounting?
- The records range from 3 to 5 mm depending on the position, so match each screw to its own hole.
- 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 Kadee HO-scale coupler mounting?
- 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.
- Where can I buy replacement screws for Kadee HO-scale coupler mounting?
- TechSpareWarehouse (our own store) lists M2 x 3mm, M2 x 4mm and M2 x 5mm, which match lengths in the records above.