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 6685-01-500-1810
NSN 5930-00-548-1821
NSN 5985-01-050-7635
NSN 6685-00-469-9323
NSN 6220-01-615-8409
NSN 5915-01-104-0481
NSN 5960-01-366-6246
NSN 5895-01-577-3186
NSN 5985-01-444-4229
NSN 5998-01-568-5126
NSN 5920-01-527-8779
NSN 5945-01-008-3608