scope:

This standard defines, illustrates and specifies allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, and studs, including heat treated machine screws, tapping screws, and screw and washer assemblies (the washer components of assemblies are excluded). This specification covers fasteners in sizes 5 to 24 mm (No. 12 to 1 inch), inclusive, with lengths up to 150 mm, inclusive, and with specified minimum tensile strength of 830 MPa (120 000 psi) and greater, which are primarily intended for use in automotive assemblies.

Remarks. This standard does not include inspection sampling requirements. It is intended that the purchaser shall specify, in the original inquiry and purchase order, the inspection sampling requirements which the producer must satisfy to demonstrate the acceptability of bolts and screws with respect to surface discontinuities.