This International Standard specifies requirements for electroplated coatings of zinc on iron or steel except for coatings applied

a) to sheet, strip or wire in the unfabricated form;
b) to close-coiled springs;
c) for other than protective or decorative purposes.
It includes information to be supplied by the purchaser to the electroplater and requirements for heat treatment, both before and after electroplating.
The coating thickness that can be applied to threaded components may be limited by imensional requirements, including class or fit. Attention is drawn to IS0 4042, which specifies the maximum thicknesses that can be applied to standard threads.