A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 5905-01-290-1201
NSN 5835-01-158-6878
NSN 5965-01-379-7706
NSN 6105-01-485-9204
NSN 5945-01-407-3716
NSN 5998-00-044-4797
NSN 5990-00-804-0678
NSN 5965-00-583-4865
NSN 5835-00-752-6065
NSN 2925-01-371-6853
NSN 5915-00-605-7102
NSN 6685-00-835-9103