scope:

This standard is intended to cover the complete general and dimensional data for the various types of square and hexagon nuts. recognized as "American Standard." Also included are appendixes covering wrench openings for nuts and formulas on which dimensional data are based. It should be understood, however, that where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. It should be noted that standards for square and hex head bolts and screws, machine screws and machine screw nuts, and other related fasteners are published under separate cover as listed on the back sheet of this standard.

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