Watch bracelets & casebacks screw size
M1.6 · 2 to 4 mm long
Watch bracelets & casebacks takes M1.6 metric screws in lengths from 2 to 4 mm.
It is listed for 2.0mm-head mini screws sold with 1.2/1.4mm variants.
This entry is marked reported and comes from ebay.co.uk.
For reference, M1.6 is 1.6 mm across the threads at 0.35 mm pitch. The imperial size people confuse it with: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.
Watch bracelets & casebacks 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 |
|---|---|---|---|---|---|---|
| M1.6 | 2–4 mm | 0.35 mm | not stated | not stated | 2.0mm-head mini screws sold with 1.2/1.4mm variants | Reported |
Fitment records and sources
2.0mm-head mini screws sold with 1.2/1.4mm variants
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
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 M1.6 screw measures about 1.6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.35 mm from one thread crest to the next (28.57 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 M1.6 heads take PH00 for Phillips and T4–T5 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 M1.6 is about 12-20 N·cm into metal threads and 6-10 N·cm into plastic bosses; snug it up and stop.
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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ASUS ROG Strix G15 G513R Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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Devices whose records share a thread with Watch bracelets & casebacks, closest length match first.
- iPad Pro 11-inch internal brackets also M1.6 × 2–4 mm
- Compact smart sensor PCBs also M1.6 × 3–4 mm
- Valve Steam Deck (LCD) also M1.6 × 3–4 mm
- iPad Mini 5 internal brackets also M1.6 × 2–3 mm
- Steam Deck (LCD) Type 7 fastener also M1.6 × 4 mm
- Steam Deck (LCD) Type 5 fastener also M1.6 × 3 mm
- iPad 6 battery connector also M1.6 × 2.3 mm
- Kindle e-reader internals also M1.6 × 3–4 mm
Questions about Watch bracelets & casebacks screws
- What size screw does Watch bracelets & casebacks use?
- M1.6 × 2–4 mm for 2.0mm-head mini screws sold with 1.2/1.4mm variants.
- How long are the screws in Watch bracelets & casebacks?
- 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 M1.6 screw?
- 0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.
- What screwdriver do I need for Watch bracelets & casebacks?
- The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M1.6?
- No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Watch bracelets & casebacks?
- TechSpareWarehouse (our own store) lists M1.6 x 3mm and M1.6 x 4mm, which match lengths in the records above.