The ground first thread lead chamfer (from 1 mm pitch) removes coarse swarf in the component and prevents premature fracture of the first full thread lead chamfer.
Design to DIN 2279 − 2299.
“Go” and “No Go” ends on a single handle (DIN 2240, part 1 form R). “No Go” end marked red.
For metric ISO fine threads, right-hand DIN 13.
Tolerances and dimensions to DIN ISO 1502.
Thread gauges for threads with other pitches, Whitworth, trapezoidal, round, UNC, UNF, and NPT threads as well as left-hand threads available on request.