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 6685-00-573-1350
NSN 5975-01-020-7131
NSN 5930-00-951-6958
NSN 5935-01-351-8844
NSN 6240-01-628-7494
NSN 6145-01-641-5055
NSN 5910-01-467-2092
NSN 6320-01-564-0893
NSN 6610-01-655-7644
NSN 5965-01-320-1808
NSN 6105-01-391-5390
NSN 5975-01-400-2509