This standard is no longer an American National Standard or an ASME-approved standard. It is available for historical reference only. This Standard covers the general and dimensional data for metric 12-spline flange 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 should consult with suppliers concerning lists of stock production 12-spline flange screws. The wrenching configuration is defined in SAE AS1325.