Applies to hot-dip galvanized coating on steel bolts, screws, nuts and other fasteners having BSW or UNC threads, in the nominal size range 1/4 inch to 1 1/2 inch diameter inclusive. It governs the purity of the galvanizing bath, the appearance of the coating under visual examination, the weight of the coating, the uniformity and adhesion of the coating, the fit of the threads on the finished articles, and the test methods to be adopted. It does not deal with the dimensions or physical properties of fasteners, depending for these on reference to relevant specifications.