Relates to dies and die-nuts for cutting metric coarse or fine pitch threads, tolerance class 6g, in accordance with AS 1721 and AS 1275, in sizes from 1 to 64 mm. Covers terms and definitions, materials and properties, dimensions and tolerances, together with testing and marking requirements.

This standard specifies requirements for screwing dies and die-nuts for cutting coarse pitch metric screw threads in accordance with AS 1275, and coarse and fine pitch metric screw threads in accordance with AS 1721, in sizes up to and including M64 for circular machine screwing dies, up to and including M24 for circular hand screwing dies and up to and including M52 for hexagon die-nuts. Appendix A gives the basis of the general dimensions and tolerances for circular machine screwing dies for screw threads up to and including M71 diameter, to enable the manufacture of screwing dies outside the dimensional range of the standard and also to provide for other diameter/pitch combinations.NOTES:1. To ensure interchangeability of circular machine screwing dies in related die heads, the external dimensions of circular machine screwing dies for inch screw threads given in AS 1364, Part 3 are the same as those specified for metric threads in this standard.2. During the transition period to the ISO metric hexagon series, hexagon die-nuts may be supplied with general dimensions in accordance with Appendix B which represents current practices soft-converted into metric units. If the purchaser specifically requires die-nuts with ISO metric hexagons as given in Tables 4.1 and 4.2, he should indicate this in his enquiry or order.

Reconfirmed 1987