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 7035-01-354-4318
NSN 5905-00-905-5813
NSN 5945-00-943-6565
NSN 5920-00-213-4838
NSN 6150-01-258-7079
NSN 5895-00-761-2335
NSN 5910-01-521-0890
NSN 7035-00-541-8516
NSN 5975-00-826-6648
NSN 5996-01-621-7893
NSN 6650-01-074-6724
NSN 6105-00-657-4903