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 6650-00-196-0637
NSN 5998-01-088-4291
NSN 6150-01-432-0709
NSN 6650-00-116-7439
NSN 5910-00-982-3503
NSN 5920-01-155-1128
NSN 6105-00-461-5962
NSN 6145-01-319-7374
NSN 6650-00-688-8587
NSN 5985-01-243-6479
NSN 6650-01-582-5388
NSN 6135-00-951-3426