Undercut head to accommodate rubber o-ring
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.
NSN 5965-01-537-7731
NSN 6240-00-933-7641
NSN 5925-00-995-8439
NSN 5920-01-497-2352
NSN 6135-01-231-4809
NSN 5920-01-027-5052
NSN 5930-00-647-1064
NSN 5960-00-192-4503
NSN 5920-01-533-5436
NSN 5925-01-059-0275
NSN 5998-01-410-1401
NSN 5960-01-495-0859