Special Features:

Screw, machine, cres psvt fl fil hd, 6-40 nf-3a x 1.000 porm 0.015; 0.211-0.221 hd diameter 0.076-0.086 hd hgt; 0.044-0.048 slot dp 0.036-0.039 slot wd; chamfer one thd x 45 deg; specification applies except as specified

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.