scope:

GENERAL: This specification contains the essentials of the following standards:

International Organization for Standardization: ISO 4032

American National Standards Institute: ANSI B18.2.4.1M

German Institute of Standardization: DIN 970

For M10, M12 and M14 sizes, across flats, across corners and height dimensions in the table on last page, reflect the latest ISO/TC2 decisions. Many nuts presently being manufactured and used, will be to the old ISO dimensions (1 mm larger across flats). It is recommended that locations such as European operations sourcing to old ISO dimensions, continue to do so until a complete and cost effective transition to the new dimensions is accomplished. Locations sourcing to the new ANSI/ISO dimensions (as stated in this standard) are urged to monitor stock and procurement practices to assure consistent production availability of the latest nuts. For M22 size, the dimensions across flats and corners are shown per latest ISO/TC2 decisions. The previous width across flats and corners, which are shaded in gray, will be deleted from the standard on its next issue. Inch series nuts may be found in ESP-E-1.101-GS.