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 6650-01-012-3290
NSN 7035-01-442-6993
NSN 5905-00-754-9396
NSN 5895-00-828-0747
NSN 5895-01-365-2244
NSN 6145-00-286-9588
NSN 6240-01-104-4494
NSN 5950-01-535-6326
NSN 6645-00-411-3733
NSN 5975-01-362-0425
NSN 6110-01-179-3669
NSN 5990-01-200-7460