Undercut 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 5905-01-096-7773
NSN 6150-01-415-2345
NSN 6105-01-651-7142
NSN 5985-01-254-2269
NSN 6110-01-423-6146
NSN 6610-01-171-3010
NSN 6610-00-888-6731
NSN 5975-00-239-7347
NSN 5990-01-407-1474
NSN 5895-01-352-5557
NSN 6645-00-169-6759
NSN 5910-01-487-3735