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 6130-01-070-1173
NSN 6220-00-030-6728
NSN 6685-01-032-5241
NSN 6150-01-421-4028
NSN 4140-01-337-0495
NSN 5905-00-148-0368
NSN 5965-01-390-9249
NSN 5905-01-025-5169
NSN 6320-01-021-6633
NSN 4140-00-468-5342
NSN 5999-00-925-2502
NSN 6220-01-420-0390