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 5975-01-315-5185
NSN 5985-01-119-4070
NSN 6620-01-044-3371
NSN 5965-01-303-1676
NSN 6645-01-414-6125
NSN 6105-01-248-1702
NSN 5998-01-378-8199
NSN 6220-01-229-5960
NSN 6135-01-396-0704
NSN 5945-01-374-2367
NSN 5930-00-306-0365
NSN 7035-01-182-1086