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 5930-01-216-9288
NSN 5905-00-106-5182
NSN 2925-01-359-9818
NSN 6320-01-176-8367
NSN 6150-01-525-2009
NSN 5965-00-244-8428
NSN 5910-01-028-6481
NSN 5950-01-096-4755
NSN 5985-01-025-0114
NSN 5990-00-922-4896
NSN 6240-01-487-7516
NSN 2925-00-201-2207