This standard stipulates the small thread tolerances of the tooth type conforming to GB/T15054.1, and the diameter and pitch conforming to GB/T15054.2. This standard applies to small threads for general purposes with a nominal diameter ranging from 0.3 to 1.4 mm.
GB/T 15054.4-1994 history
2018GB/T 15054.2-2018 Miniature screw threads.Part 2:Tolerances and limits of size