Head undercut
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 6620-01-179-2657
NSN 5998-01-289-0937
NSN 5855-01-380-6186
NSN
NSN 5925-00-787-7206
NSN 5905-00-661-2395
NSN 5998-01-041-6224
NSN 6650-00-116-7439
NSN 5985-00-548-4241
NSN 6130-01-056-4204
NSN 5965-01-220-0529
NSN 5905-01-500-2135