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 6320-01-462-2295
NSN 5965-00-296-1808
NSN 5999-01-127-1999
NSN 5998-01-390-7474
NSN 6645-00-067-7070
NSN 5895-00-447-9688
NSN 5920-01-133-2924
NSN 6105-01-321-7466
NSN 5855-01-266-1645
NSN 5996-00-706-9390
NSN 6220-01-100-4340
NSN 6130-00-466-8939