Sunglasses & heavier metal frames screw size
M1.6 · 4 mm long
Sunglasses & heavier metal frames takes M1.6 metric screws, 4 mm long.
The record covers 2.5 x 1.6 x 4.0mm sunglasses hinge screw standard.
This entry is marked confirmed and comes from shuntool.com.
An M1.6 screw is 1.6 mm in diameter with a 0.35 mm pitch, tapped with a 1.25 mm drill; imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.
Sunglasses & heavier metal frames 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 | 4 mm | 0.35 mm | not stated | not stated | 2.5 x 1.6 x 4.0mm sunglasses hinge screw standard | Confirmed |
Fitment records and sources
2.5 x 1.6 x 4.0mm sunglasses hinge screw standard
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
How to check the screw before you buy
- If the hinge barrel is stripped, an oversize or self-tapping repair screw is the usual fix rather than the original size.
- 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 record states 4 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 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.
Common mix-ups with M1.6
- Heavier metal sunglass hinges use M1.6 while acetate frames use M1.4 or M1.2; you cannot tell without calipers.
- Headphone hinge screw sizes are usually quoted from screwdriver bit size, not an actual thread spec - measure before buying.
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.
-
M1.6 x 4mm Screws Compatible with Dell XPS 14 9440 Battery System Board 10-Pack
$4.99 -
M1.6 x 4mm Phillips Wafer Head Micro Screws LCD Shell Repair 10-Pack
$4.99
-
M1.6 Phillips Flat Head Carbon Steel Machine Screws (Multiple Lengths & Finishes)
$0.05Choose size -
M1.6 Phillips Flat Head Carbon Steel Machine Screws (Multiple Lengths & Finishes) | 50-Pack
From $4.99Choose size
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Browse all 21 in Eyewear →The same screw also fits
Devices whose records share a thread with Sunglasses & heavier metal frames, closest length match first.
- Spectacle frame hinge screws (ISO 11381 standard) also M1.6 × 4 mm
- Valve Steam Deck (LCD) back cover also M1.6 × 4 mm
- Dell Precision 5770 also M1.6 × 4 mm
- ASUS ROG Ally (RC71L) also M1.6 × 4 mm
- PW-Sat2 CubeSat fastener bill of materials also M1.6 × 4 mm
- NBK SPE-MC PEEK micro pan head screws also M1.6 × 4 mm
- Microscope stage clip / condenser also M1.6 × 4 mm
- Dell Precision 5760 also M1.6 × 4 mm
Questions about Sunglasses & heavier metal frames screws
- What size screw does Sunglasses & heavier metal frames use?
- M1.6 × 4 mm for 2.5 x 1.6 x 4.0mm sunglasses hinge screw standard.
- How long are the screws in Sunglasses & heavier metal frames?
- The record gives 4 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 Sunglasses & heavier metal frames?
- 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 Sunglasses & heavier metal frames?
- TechSpareWarehouse (our own store) lists M1.6 x 4mm, which matches the length in the records above.