ISO 16239:2013

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ISO 16239:2013 is an International Standard that specifies the requirements for metric series wires used to measure screw thread pitch diameters. These wires are designed for use on screw threads with small lead angles (less than 5 degrees), and they are primarily used to calibrate thread pitch gauges. The standard covers the material, nominal diameters, and diameter tolerances of these wires, applicable to various thread types like ISO general purpose metric threads, Unified screw threads, Whitworth pipe threads, and ISO metric trapezoidal threads with standard pitches.