scope:

This specification covers the physical and mechanical properties of various types of hexagon and square head bolts having nominal diameters of ¼ inch and larger.

Bolts shall be of the following types and sizes, as specified (see 6.2).

Type I - Square head bolts. Type II - Hexagon head bolts. Type III - Heavy hexagon head bolts. Type IV - Heavy hexagon head structural bolts.

Bolts shall be classified according to size by the basic thread diameter.

intended Use:

Hexagon and square head bolts are designed for insertion through holes in assembled parts and are normally intended to be tightened or released by torquing a nut.