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 5960-01-062-4087
NSN 5950-01-157-9482
NSN 6145-00-246-9776
NSN 6105-01-578-6318
NSN 5975-01-305-3815
NSN 6240-01-597-4870
NSN 5920-00-672-5583
NSN 5915-00-577-0465
NSN 6130-01-033-1536
NSN 5855-00-862-3345
NSN 2925-01-043-9786
NSN 6320-01-322-8340