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ISO 11381:2016 Ophthalmic optics - Spectacle frames - Screw threads
standard by International Organization for Standardization, 10/01/2016
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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.