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The trapezoidal thread calculator for metric trapezoidal thread dimensions of single and
multiple start trapezoidal threaded rods and nuts for different
pitch diameter tolerance classes.

ISO metric trapezoidal thread profile is a thread form with 30° angle of thread which is used for lead screws (power screws).
Dimensions and tolerances for metric trapezoidal screw threads are defined in
ISO 2901:1993, ISO 2902:1977, ISO 2903:1993 and ISO 2904:1977 standards. Gauges and gauging for ISO metric trapezoidal screw thread are defined in the DIN 103-9:1985 standard.