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 6220-01-257-9288
NSN 5975-01-599-9387
NSN 5835-01-028-0097
NSN 6645-01-068-3042
NSN 6620-00-104-6937
NSN 5985-00-816-8486
NSN 5950-00-067-9950
NSN 6220-01-230-6727
NSN 5915-00-948-9161
NSN 5925-00-186-0765
NSN 6135-01-184-0727
NSN 6610-01-287-9814