ISO 5969:1979

Ground thread taps for pipe threads G series and Rp series — Tolerances on the threaded portion

Specifies the deviations and tolerances on the major diameter and the pitch diameter together with the limits of these diameters for ground thread taps intended for production of these pipe threads acoording to ISO 228-1 and ISO 7-1 respectively. the internal threads produced with the ground thread taps are conventionally designated by the simplified denomination od “nut”.