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 6105-01-278-9830
NSN 6620-00-273-8735
NSN 6620-00-527-6523
NSN 6320-01-157-9076
NSN 4140-01-216-0008
NSN 5996-01-657-0097
NSN 5998-01-151-5807
NSN 6220-00-553-8938
NSN 6220-01-505-9880
NSN 4140-01-168-7685
NSN 4140-01-094-1621
NSN 6220-00-578-6539