A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6240-00-653-5621
NSN 6650-01-100-3185
NSN 2925-00-878-2196
NSN 5895-00-038-0847
NSN 6145-00-802-6489
NSN 5996-00-594-8587
NSN 6645-00-790-0944
NSN 5960-01-431-4291
NSN 5935-01-149-8602
NSN 5835-00-501-2581
NSN 7035-01-421-7159
NSN 5975-01-378-2320