Watch casebacks & dials screw size
M1.4 · 2 to 4 mm long
Our records put Watch casebacks & dials on M1.4 screws in lengths from 2 to 4 mm.
The record covers sold interchangeably with eyeglass screws in mini-screw assortments.
This entry is marked reported and comes from ebay.co.uk.
M1.4 means a 1.4 mm nominal diameter with a 0.3 mm thread pitch. Imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix.
Watch casebacks & dials 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 |
|---|---|---|---|---|---|---|
| M1.4 | 2–4 mm | 0.3 mm | not stated | not stated | sold interchangeably with eyeglass screws in mini-screw assortments | Reported |
Fitment records and sources
sold interchangeably with eyeglass screws in mini-screw assortments
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
How to check the screw before you buy
- Over-long screws in phones are a known cause of damaged boards (Apple's 'long screw damage'), so never swap positions.
- Diameter: across the threads an M1.4 screw measures about 1.4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.3 mm from one thread crest to the next (33.33 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 2–4 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M1.4 heads take PH000 / PH00 for Phillips and T2–T3 for Torx, and a 1.3 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 M1.4 is about 8-12 N·cm into metal threads and 4-7 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M1.4
- M1.4 is THE Samsung Galaxy internal screw across S, A, M and Note lines — but lengths run 2.3mm to 4mm+ and are not interchangeable between models.
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 Watch casebacks & dials, closest length match first.
- Fairphone 2 / 3 / 4 internal screws also M1.4 × 3.8–4 mm
- Samsung Galaxy S23 screen/battery assembly also M1.4 × 2–3 mm
- Samsung Galaxy S23 board screws also M1.4 × 2–3 mm
- Apple Watch case screws also M1.4 × 2 mm
- Sennheiser MOMENTUM M2 On-Ear headphone also M1.4 × 3.5 mm
- ASUS ROG Ally (RC71L) also M1.4 × 3 mm
- Samsung Galaxy S23 USB-C daughterboard also M1.4 × 2–3 mm
- Samsung Galaxy A-series internal repair screw also M1.4 × 3 mm
Questions about Watch casebacks & dials screws
- What size screw does Watch casebacks & dials use?
- M1.4 × 2–4 mm for sold interchangeably with eyeglass screws in mini-screw assortments.
- How long are the screws in Watch casebacks & dials?
- The records range from 2 to 4 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M1.4 screw?
- 0.3 mm (coarse), which is the standard pitch for M1.4 machine screws. The tap drill is 1.1 mm and the normal clearance hole is 1.6 mm.
- What screwdriver do I need for Watch casebacks & dials?
- The sources do not name the drive. For M1.4, Phillips heads normally take PH000 / PH00 and Torx heads T2–T3; socket heads take a 1.3 mm hex key.
- Can I use an imperial screw instead of M1.4?
- No. Imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix. Use a true M1.4 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Watch casebacks & dials?
- TechSpareWarehouse (our own store) lists M1.4 x 2mm, which matches the length in the records above.