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.

Some segments of the ISO and national standards encompassed by this general specification may differ. 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 is based on and contains elements of the following standards:

International Organization for Standardization: ISO 68, 261, 262, 888, 898/1, 965/1 and 965/2

American National Standard: ANSI B-18.2.3.9M - 2001 (Heavy Hex dimensions)