ASME B18.2.3.1M-1999 (R2011)

This standard covers the complete general and dimensional data for metric hex cap screws recognized as American National Standard. The inclusion of dimensional data in this standard is not intended to imply that all of the sizes in conjunction with the various options described herein are stock items. Consumers are requested to consult with manufacturers concerning lists of stock production hex cap screws. Hex cap screws purchased for Government use shall conform to this standard, and additionally to the requirements of Appendix III.