A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6220-01-522-2729
NSN 5985-01-084-7776
NSN 6650-01-542-9495
NSN 5910-01-262-6753
NSN 5915-01-023-0300
NSN 5925-00-382-3574
NSN 5855-01-501-5176
NSN 5835-00-092-1136
NSN 5835-00-269-2232
NSN 6320-01-125-3361
NSN 5925-01-487-8190
NSN 5999-00-581-9724