scope:

This standard is intended to cover the complete general and dimensional data for the various types of square and hex bolts and screws recognized as "American National Standard." Also included are appendixes covering thread runout sleeve gages, gaging procedure for checking bolt and screw straightness, grade markings for stee I bolts and screws, formulas on which dimensional data are based, wrench openings for bolts and screws, and a specification to assist in identifying a product as being a screw or a bolt. It should be understood, however, that where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula.

The inclusion of dimensional data in this standard is not intended to imply that all of the products described herein are stock production sizes. Consumers are requested to consult with manufacturers concerning lists of stock production sizes.