Special Features:

Includes external serrations: 24; pitch diameter: 0.3906 in; major dia: 0.408 in; circular tooth width, min dim: 0.022 in; max effective w/gage: 0.025 in; mates w/pn 5139987; final protective finish; manganese phosphate base, type m, class 1, w/vv-l-800 supplementary oil treatment or zinc phosphate base, type z, class 1, w/vv-l-800 supplementary oil treatment

Properties:

An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal 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. Excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.