ASME B18.13.1M-2011 (R2022)

This Standard covers the general, dimensional, material, and mechanical requirements for metric through-hardened (property classes 8.8, 9.8, and 10.9) machine screws and case-hardened tapping screws from 5 mm to 12 mm captivated washer assemblies (SEMS). The covered washer types are helical, plain, conical, and toothed.

This Standard describes two different methods of SEMS manufacturing. It also covers standard and modified hardness requirements for machine screw SEMS.

The inclusion of dimensional data in this Standard is not intended to imply that all of the products described herein are stock production items. Consumers should consult with respective suppliers concerning the availability of products.

In addition, this Standard includes Nonmandatory Appendices that contain information considered of significant importance to both purchaser and manufacturer.