Spectacle frames per ISO 11381 screw size
M1.2 / M1.4 / M1.6 / M2 · length not stated in the sources
Spectacle frames per ISO 11381 takes M1.2, M1.4, M1.6 and M2 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
There are 4 separate fitment records for it, including M1.2 x 0.25 is one of six standard eyewear frame threads (M1.2), M1.4 x 0.3 is a standard eyewear frame thread (M1.4) and M1.6 x 0.35 is a standard eyewear frame thread (M1.6), plus 1 more in the table below.
4 of the 4 records are marked confirmed, drawn from 1 source (standards.iteh.ai).
M1.2 means a 1.2 mm nominal diameter with a 0.25 mm thread pitch. Imperial look-alike: #0-80 UNF (1.52 mm) is the closest imperial screw, but it is bigger — not a substitute.
Spectacle frames per ISO 11381 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 |
|---|---|---|---|---|---|---|
| M1.2 | not stated | 0.25 mm | not stated | not stated | M1.2 x 0.25 is one of six standard eyewear frame threads | Confirmed |
| M1.4 | not stated | 0.3 mm | not stated | not stated | M1.4 x 0.3 is a standard eyewear frame thread | Confirmed |
| M1.6 | not stated | 0.35 mm | not stated | not stated | M1.6 x 0.35 is a standard eyewear frame thread | Confirmed |
| M2 | not stated | 0.4 mm | not stated | not stated | M2.0 x 0.4 is the largest standard eyewear frame thread | Confirmed |
Fitment records and sources
M1.2 x 0.25 is one of six standard eyewear frame threads
pitch 0.25 mm · tap 0.95 mm · clearance 1.4 mm · PH000 / JIS 00 / Torx T1–T2
M1.4 x 0.3 is a standard eyewear frame thread
pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3
M1.6 x 0.35 is a standard eyewear frame thread
pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5
M2.0 x 0.4 is the largest standard eyewear frame thread
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
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 M1.2 screw measures about 1.2 mm with calipers (usually a hair under). This device also uses M1.4 / M1.6 / M2, so measure each screw rather than assuming they match.
- Pitch: 0.25 mm from one thread crest to the next (40 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 M1.2 heads take PH000 / JIS 00 for Phillips and T1–T2 for Torx; 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 M1.2 is about 5-8 N·cm into metal threads and 3-5 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M1.2 / M1.4 / M1.6 / M2
- M1.2 and M1.4 look identical in an eyeglass repair kit — the wrong one strips soft acetate or metal hinges.
- Eyewear screws are named thread x shaft x length, a different convention from ISO metric naming — easy to order wrong.
- Heavier metal sunglass hinges use M1.6 while acetate frames use M1.4 or M1.2; you cannot tell without calipers.
- 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 Eyewear
The same screw also fits
Devices whose records share a thread with Spectacle frames per ISO 11381, closest length match first.
- Sunglasses hinges (fashion/budget frames) also M1.2
- Eyeglass hinge screw (internal thread spec) also M1.4
- Eyeglass hinge repair screw (Tabco SM106) also M1.6
- Eyewear repair kits (hinge and temple screws) also M1.4
- Eyeglass small-head Phillips screw also M1.2
- Eyeglass hinge & eyewire screw also M1.4
- Eyeglass frame self-tapping screw also M1.2
- Eyeglass torx nut/screw for rimless frames also M1.4
Questions about Spectacle frames per ISO 11381 screws
- What size screw does Spectacle frames per ISO 11381 use?
- M1.2 for M1.2 x 0.25 is one of six standard eyewear frame threads; M1.4 for M1.4 x 0.3 is a standard eyewear frame thread; M1.6 for M1.6 x 0.35 is a standard eyewear frame thread; M2 for M2.0 x 0.4 is the largest standard eyewear frame thread.
- How long are the screws in Spectacle frames per ISO 11381?
- 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 M1.2 screw?
- 0.25 mm (coarse), which is the standard pitch for M1.2 machine screws. The tap drill is 0.95 mm and the normal clearance hole is 1.4 mm.
- What screwdriver do I need for Spectacle frames per ISO 11381?
- The sources do not name the drive. For M1.2, Phillips heads normally take PH000 / JIS 00 and Torx heads T1–T2.
- Can I use an imperial screw instead of M1.2?
- No. Imperial look-alike: #0-80 UNF (1.52 mm) is the closest imperial screw, but it is bigger — not a substitute. Use a true M1.2 screw so it does not cross-thread or strip the hole.