scope:

GENERAL: Implementation of this standard must be in accordance with the policies and procedures outlined in MPAPS S-A-0.101. There may also be supplemental group instructions in regard to use of metric standards that should be taken into account.

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

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 MPAPS S-E-1.101-GS/PL.