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 5999-00-090-4838
NSN 5945-01-460-2038
NSN 5975-00-519-8421
NSN 6620-01-624-3933
NSN 6240-00-235-5159
NSN 6135-01-461-6521
NSN 5985-00-045-9696
NSN 2925-00-294-4140
NSN 6645-01-267-4379
NSN 6610-00-504-2839
NSN 6135-01-079-7852
NSN 6150-00-942-2883