Watertight head
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 6610-01-102-2256
NSN 6645-00-664-4665
NSN 5950-01-431-9818
NSN 4140-01-481-3374
NSN 6650-01-564-6681
NSN 5835-00-286-5432
NSN 6650-01-013-0071
NSN 6150-00-890-8294
NSN 6110-01-158-1860
NSN 6320-00-845-3261
NSN 6105-00-177-3684
NSN 5925-01-296-8711