
Black bolts, screws and nuts (hexagon and square with BSW threads) and partly machined bolts, screws and nuts (hexagon and square with BSW or BSF threads)
出版:Standards Australia

专家解读视频
Relates to ferrous bolts, screws and nuts. Dimensions and certain requirmeents are given in respect of bolts, screws and nuts which are either black all over or have partially machined finishes. The bolts, screws and nuts may be produced by hot or cold forging at the option of the manufacturer.
BS 916:1953 - Equivalent