英文原版是：
1.1.1 This Standard is intended to cover the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts, recognized as American National Standard. Also included are appendices covering
gaging of slots in slotted nuts, 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, thedimensions in the tables shall govern over recalculation by formula.

3.14 Grade and Manufacturer’s Identification Marking
Grade and manufacturer’s markings shall be applied as required by the applicable mechanical and performance standard except that markings are not required for the machine screw nuts per Tables 1-1 and 1-2.

就是普通螺母，應該是翻譯的問題,，看下原文,。