American Machine Screw Standards

GENERAL: This standard conforms in all essentials with American National Standard B18.6.3 (R 1983) for Hex Machine Screw Nuts.

GENERAL: This standard conforms essentially with the American National Standard B-18.6.3 for various types of slotted and recessed head machine screws. Truss Head, Round Head and Binding Head Machine Screws are not approved for new design and should be replaced in...

This standard for Metric Hex Head Machine Screws conforms in all essentials with the American National Standard covering metric machine screws. For the M10 screw size. It documents the 15.0 mm rather than the 16.0 mm hexagon head width across flats as the...

GENERAL: These standards may differ in some respects with certain segments of ISO and national standards. In recognition of these differences, the sizes and tolerance ranges used were established in an effort to enable the use of commercially available items that are dimensionally interchangeable...

This standard for Metric Hex Flange Head Machine Screws conforms in all essentials with the American National Standard covering metric machine screws. It should be noted that the hexagon widths on these screws differ from those on the corresponding sizes of...

This standard for Metric Hex Washer Head Machine Screws conforms in all essentials, except head proportions, with the American National Standard covering metric machine screws. The basic head dimensions agree with those included in earlier national standard...

This standard for Metric Pan Head 6-Lobed Socket Machine Screws conforms in all essentials with the American National Standard covering metric machine screws. It should be noted that the head diameter and head height limits specified herein differ to varying...

This standard for Metric Oval 90° Countersunk Head 6-Lobed Socket Machine Screws conforms in all essentials, except driving provisions, with the American National Standard covering metric machine screws. In general, screws made in conformance with this...