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 5915-00-492-1474
NSN 5895-01-366-5016
NSN 5999-01-098-4924
NSN 5915-00-420-1557
NSN 6645-01-392-9615
NSN 5985-01-334-6741
NSN 6685-01-555-7938
NSN 5935-00-419-0121
NSN 6685-01-364-8273
NSN 6145-01-614-7810
NSN 5920-01-037-5869
NSN 5920-01-065-1824