A headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head.
NSN 6620-01-406-6840
NSN 5998-01-023-2153
NSN 5950-01-226-1074
NSN 6105-01-641-3334
NSN 5895-00-912-4745
NSN 5965-01-394-1542
NSN 5835-00-408-5499
NSN 4140-01-468-0476
NSN 6240-00-364-0850
NSN 6620-01-442-8444
NSN 5985-00-446-0074
NSN 6135-00-112-8637