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 6135-00-686-4777
NSN 4140-01-540-5318
NSN 5996-01-578-6955
NSN 6130-01-184-3987
NSN 5950-01-179-6015
NSN 5905-01-464-3541
NSN 5950-01-062-0643
NSN 5960-00-984-6413
NSN 5985-01-414-3368
NSN 5985-00-403-2408
NSN 5895-01-462-1464
NSN 5920-01-467-2079