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 5975-00-171-3608
NSN 5960-00-059-3082
NSN 5935-01-459-7424
NSN 6105-01-252-2926
NSN 5998-01-536-2462
NSN 6145-00-275-4046
NSN 5950-01-076-7012
NSN 5920-01-265-5957
NSN 6220-01-148-9021
NSN 6645-01-348-3359
NSN 6320-01-359-3921
NSN 5999-00-493-9471