This International Standard specifies the dimensions for reduced shank taps with nominal diameters from M3 to M24 and 1/8 in to 1 in and thus complements ISO 8051 which concerns full-diameter shank taps. It applies to long shank machine taps. Technical specifications for taps covered by this International Standard (including marking) are given in ISO 8830. This International Standard 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). The following non-recommended inch threads — "British Standard Whitworth" (BSW) and"British Standard Fine" (BSF); — "British Association" (BA) are given in Annex A.