A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6135-00-087-5300
NSN 5999-00-186-9314
NSN 5935-00-801-3537
NSN 5945-00-107-7334
NSN 5910-01-177-5216
NSN 5920-00-159-8582
NSN 5990-01-507-1479
NSN 6110-01-574-0419
NSN 5910-01-605-7651
NSN 6645-01-393-5128
NSN 5895-01-506-5873
NSN 6105-01-465-1285