A headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. It is designed to be locked in place by either a ring, lock, serrated or a ring, lock, keyed.
NSN 5915-01-196-9426
NSN 2925-00-005-1618
NSN 6650-01-302-9695
NSN 5835-01-416-6455
NSN 5945-01-294-1474
NSN 5905-01-566-8378
NSN 5999-00-363-3435
NSN 5950-01-161-0389
NSN 6620-01-542-9999
NSN 5999-01-036-5755
NSN 5895-01-277-1520
NSN 6240-01-316-8622