What size screw does Spectacle frame hinge screws (ISO 11381 standard) use?

M1.4 × 2–4 mm for ISO 11381:2016 lists M1.4 x 0.3 as a standard spectacle-frame screw thread size alongside M1.0, M1.2, M1.6 and M2.0; M1.6 × 2–5 mm for ISO 11381:2016 specifies M1.6 x 0.35 as one of the standard ophthalmic screw thread sizes for spectacle frames.

How long are the screws in Spectacle frame hinge screws (ISO 11381 standard)?

The records range from 2 to 5 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 Spectacle frame hinge screws (ISO 11381 standard)?

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 Spectacle frame hinge screws (ISO 11381 standard)?

TechSpareWarehouse (our own store) lists M1.4 x 2mm, M1.6 x 3mm and M1.6 x 4mm, which match lengths in the records above.

Spectacle frame hinge screws (ISO 11381 standard) screw size

M1.4 / M1.6 · 2 to 5 mm long

The screws used on Spectacle frame hinge screws (ISO 11381 standard) are M1.4 and M1.6 in lengths from 2 to 5 mm.

There are 2 separate fitment records for it, including ISO 11381:2016 lists M1.4 x 0.3 as a standard spectacle-frame screw thread size alongside (M1.4) and ISO 11381:2016 specifies M1.6 x 0.35 as one of the standard ophthalmic screw thread sizes (M1.6).

2 of the 2 records are marked confirmed, drawn from 1 source (standards.iteh.ai).

For reference, M1.4 is 1.4 mm across the threads at 0.3 mm pitch. The imperial size people confuse it with: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix.

Spectacle frame hinge screws (ISO 11381 standard) 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	ISO 11381:2016 lists M1.4 x 0.3 as a standard spectacle-frame screw thread size alongside M1.0, M1.2, M1.6 and M2.0	Confirmed
M1.6	2–5 mm	0.35 mm	not stated	not stated	ISO 11381:2016 specifies M1.6 x 0.35 as one of the standard ophthalmic screw thread sizes for spectacle frames	Confirmed

Fitment records and sources

M1.42-4 mm (standard range)confirmed

ISO 11381:2016 lists M1.4 x 0.3 as a standard spectacle-frame screw thread size alongside M1.0, M1.2, M1.6 and M2.0

pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3

Source

M1.62-5 mm (standard range)confirmed

ISO 11381:2016 specifies M1.6 x 0.35 as one of the standard ophthalmic screw thread sizes for spectacle frames

pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5

Source

How to check the screw before you buy

Eyeglass hinge screws are tiny; a jeweller's screwdriver and a bit of thread-locker or a self-locking screw keep them from backing out.
Diameter: across the threads an M1.4 screw measures about 1.4 mm with calipers (usually a hair under). This device also uses M1.6, so measure each screw rather than assuming they match.
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 2–5 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard 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 / M1.6

Eyewear screws are named thread x shaft x length, a different convention from ISO metric naming — easy to order wrong.
Slice Engineering also lists 1.3mm and 2mm hex keys - those are driver sizes, not thread sizes.
Headphone hinge screw sizes are usually quoted from screwdriver bit size, not an actual thread spec - measure before buying.
Heavier metal sunglass hinges use M1.6 while acetate frames use M1.4 or M1.2; you cannot tell without calipers.

Pitch gauge · Screw size finder · Torque guide

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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The same screw also fits

Devices whose records share a thread with Spectacle frame hinge screws (ISO 11381 standard), closest length match first.

Sunglasses & heavier metal frames also M1.6 × 4 mm
Eyeglass & sunglass metal hinges also M1.4 × 2.6–4 mm
Eyewire / hinge screw, large head (QTE Vigor 80086) also M1.4 × 3.8 mm
Eyeglass frame hinge (DIN 963 slotted countersunk) also M1.4 × 3 mm
Eyeglass hinge repair screw (Tabco SM106) also M1.6 × 5 mm
Eyeglass hinge screw (internal thread spec) also M1.4 × 2.5–4 mm
Dell G5 15 5587 also M1.6 × 2.2 mm
NBK SPE-MC PEEK micro pan head screws also M1.4 × 2–4 mm

Questions about Spectacle frame hinge screws (ISO 11381 standard) screws

What size screw does Spectacle frame hinge screws (ISO 11381 standard) use?: M1.4 × 2–4 mm for ISO 11381:2016 lists M1.4 x 0.3 as a standard spectacle-frame screw thread size alongside M1.0, M1.2, M1.6 and M2.0; M1.6 × 2–5 mm for ISO 11381:2016 specifies M1.6 x 0.35 as one of the standard ophthalmic screw thread sizes for spectacle frames.
How long are the screws in Spectacle frame hinge screws (ISO 11381 standard)?: The records range from 2 to 5 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 Spectacle frame hinge screws (ISO 11381 standard)?: 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 Spectacle frame hinge screws (ISO 11381 standard)?: TechSpareWarehouse (our own store) lists M1.4 x 2mm, M1.6 x 3mm and M1.6 x 4mm, which match lengths in the records above.

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