Ophthalmic optics - Spectacle frames - Screw threads (ISO 11381:2016)
ISO 11381:2016 specifies requirements for ISO metric screw threads for use with spectacle frames. Provision is made for screw threads of the following nominal sizes: S0,8 × 0,2 M1,0 × 0,25 M1,2 × 0,25 M1,4 × 0,3 M1,6 × 0,35 and M2,0 × 0,4 and for related taps and gauges.
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