ISO 16239 pdf download Metric series wires for measuring screw threads hislnternationa Standard specifiesthe material,metric series nominal diameters. diametertolerancesand designation for screw thread measuring wires. This International Standard is applicable to the measurement of the pitch diameters of ISO generaourpose metric screw threads (M), Unified screw threads (UN), Whitworth pipe threads (G, R), andSO metric trapezoidal screw threads (Tr) with...