Special Features:

Screw, externally relieved body, steel, cad pld, sae-ams-s-6758 matl, 4-40 nc 3a x 13/16, 0.240-0.260 in. Diameter of head, 0.105 in. Height of head; 0.194 in. Thd lg; 0.138-0.142 in. First diameter frm head; 0.070-080in. Second diameter from head; 0.547 in. From head to end of first dia; 0.618 in. From hd to end of second dia.; specification applies except as indicated

Properties:

An externally threaded fastener whose threaded portion is of one nominal diameter, and whose unthreaded portion has been machined or ground in one or more places or over its entire length to a maximum diameter less than the minimum pitch diameter of the thread (excludes undercut for thread relief). It is no. 0 (0.060 in.) (1.5 mm) or larger, and is designed to be held or driven with either a wrench or inserted driver (excluding internal socket and multiple spline types) or both in sizes below no. 10 (0.190 in.) (5 mm) and larger sizes must have a head designed for any type inserted driver (excluding internal socket and multiple spline types) but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. See also bolt, externally relieved body and bolt, internal wrenching.