scope:

NEN-ISO 529 specifies the general dimensions of short machine taps and hand taps. These dimensions, established as functions of the thread diameter and pitch, are the following: - length of thread (maximum); - overall length; - shank diameter and dimensions of driving square; - dimensions of the connecting portion between the shank and threaded part. This document is applicable to taps intended for cutting the following threads: a) ISO metric threads: - coarse pitch; - fine pitch; b) ISO inch threads: - "Unified Coarse" series (UNC) and "Unified Fine" series (UNF); c) Inch threads, non-recommended: - "British Standard Whitworth" (BSW) and "British Standard Fine" (BSF); - "British Association" (BA).