BS 3643-2:1981

Specifies the fundamental deviations, tolerances and limits of size for tolerance classes 4H, 5H, 6H and 7H for internal threads and 4h, 6g, and 8g for external threads for coarse pitch 1 mm to 68 mm diameter, fine pitch 1 mm to 33 mm diameter and constant pitch 8 mm to 300 mm diameter.

Cross References:
BS 3382
BS 3643:Part 1
PD 6494
ISO/DIS 4042


Incorporates the following:
AMD 5094 published 30 June 1986