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 5920-01-648-2686
NSN 4140-00-952-2287
NSN 5895-01-352-5695
NSN 5930-00-007-4228
NSN 5855-00-233-2366
NSN 6240-01-140-8762
NSN 5930-00-078-8632
NSN 5950-01-466-9196
NSN 6610-01-278-9387
NSN 6610-01-421-4396
NSN 6645-01-054-4423
NSN 5996-00-538-6069