ISO 11381:2016
Ophthalmic optics — Spectacle frames — Screw threads
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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Foreword
1 Scope
2 Normative references
3 Screw threads
4 Definitions and tolerances on lengths of screws
4.1 Flat head machine screws
4.2 Countersunk head screws
4.3 Fillister — countersunk head screws
4.4 Pan and cheese head screws
4.5 Tolerance on length
5 Screwing taps
6 Gauges
Annex A (informative) Use and application of screw threads
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Foreword
1 Scope
2 Normative references
3 Screw threads
4 Definitions and tolerances on lengths of screws
4.1 Flat head machine screws
4.2 Countersunk head screws
4.3 Fillister — countersunk head screws
4.4 Pan and cheese head screws
4.5 Tolerance on length
5 Screwing taps
6 Gauges
Annex A (informative) Use and application of screw threads