scope:

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

International Organization for Standardization: ISO/4014

American National Standards Institute: ANSI B18.2.3.1M

German Institute of Standards: DIN 931

For M10, M12 and M14 sizes, across flats, across corners and head height dimensions on page 9, reflect the latest ISO/TC2 decisions. Many bolts 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 bolts. For M22 size, 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.

Letter symbols designating dimensional characteristics are in accord with those used in ANSI and ISO standards.

RESTRICTED CHEMICAL SUBSTANCES: Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification.