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 6105-00-411-6226
NSN 4140-00-256-1471
NSN 5835-00-106-2120
NSN 5975-01-386-5974
NSN 5950-01-120-7775
NSN 5990-00-813-2205
NSN 5985-00-229-8788
NSN 5990-01-463-5400
NSN 6150-00-111-4099
NSN 6645-00-641-3202
NSN 6610-01-640-9039
NSN 5920-00-166-7877