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 5999-01-012-1934
NSN 6110-00-553-8816
NSN 6145-00-932-1950
NSN 6320-01-227-2648
NSN 6610-01-381-8898
NSN 5905-00-849-5520
NSN 5855-01-330-3669
NSN 6110-01-654-9018
NSN 5920-00-280-5082
NSN 5895-01-472-5248
NSN 7035-00-009-8705
NSN 5950-00-113-9956