Relates to dies and die-nuts for cutting both parallel and taper pipe threads of Whitworth form in accordance with AS 1721, and in the following series and size ranges: G series from 1/16 to 2¼; RL series from 1/16 to 2; R series from 1/16 to 2. Covers terms and definitions, materials and properties, dimensions and tolerances, together with testing and marking requirements.
