BS 3172:1995 Specification for screw threads for spectacle frames
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This International Standard 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 x 0.2; M1,0 x 0.25; M1.2 x 0.25; M1,4 x 0,3; M1.6 x 0,35 and M2.0 x 0,4 and for related taps and gauges.