M1.4 vs M1.6
They differ by 0.2 mm across the threads — enough that they are never interchangeable, but little enough that they are easy to mix up in a parts tray.
| M1.4 | M1.6 | |
|---|---|---|
| Thread diameter | 1.40 mm | 1.60 mm |
| Standard pitch | 0.3 mm | 0.35 mm |
| Tap drill | 1.1 mm | 1.25 mm |
| Clearance hole | 1.6 mm | 1.8 mm |
| Cap head Ø | 2.6 mm | 3 mm |
| Hex key | 1.3 mm | 1.5 mm |
| Torque into steel | 8-12 N·cm | 12-20 N·cm |
| Into plastic | 4-7 N·cm | 6-10 N·cm |
M1.4 is normally used for
Standard eyeglass hinge screw, camera bodies, phone internals, micro drones
Everything M1.4 fits →M1.6 is normally used for
Laptop hinges and boards, connectors, small standoffs, instrument panels
Everything M1.6 fits →If you are not sure which one you have
Measure across the outside of the threads with a caliper. A reading within about 0.1 mm of the nominal size is your answer — 1.4 mm means M1.4, 1.6 mm means M1.6.
Use the screw size finder →Buy either size
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M1.4 screws
Assorted lengths in one box
M1.6 screws
Assorted lengths in one box
Digital caliper
Tells the two sizes apart for certain