scope:

Introduction

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. This standard specifies recommended methods for gaging of external hexalobular driving feature. This standard is based on DIN 34801, Annex A. This standard is to be utilized to assure dimensional compliance of hexalobular bolt head styles.

Applicability. As an alternative head style where standard hex style head may not be the appropriate drive feature or if for esthetic purposes to drive alternative styling.

Remarks. This standard is available as an alternate head style over the GM fastening strategy to utilize standard hex type head sizes, i.e. 10 mm, 13 mm, 15 mm, 18 mm, 21 mm, 24 mm, etc. Across Flats. The hex strategy is utilized for tool interchangeability between bolt and nut product of same diameter.