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 5835-01-442-6079
NSN 6135-00-405-1989
NSN 6685-01-139-4755
NSN 5950-01-536-2147
NSN 5895-00-231-1461
NSN 5905-00-882-2019
NSN 6645-00-309-0447
NSN 6685-01-577-6405
NSN 5960-01-117-6577
NSN 5905-01-525-0153
NSN 6685-01-069-7336
NSN 5905-01-473-0687