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.
Classification: Bolts and bolts and their nuts or washers exported in the same shipment
NSN 4140-01-507-3172
NSN 6110-01-476-4708
NSN 5950-00-831-6555
NSN 5920-00-916-5514
NSN 6145-01-457-1082
NSN 6620-01-129-7247
NSN 5945-00-105-5537
NSN 5996-01-151-1607
NSN 5950-01-459-7961
NSN 6220-01-152-2637
NSN 5965-01-241-9865
NSN 6220-01-284-6347