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 5905-01-510-9397
NSN 6150-01-010-3727
NSN 5910-00-166-7483
NSN 2925-01-032-3814
NSN 5996-01-234-4147
NSN 5950-01-110-7128
NSN 5998-01-255-7612
NSN 5915-00-964-6381
NSN 5950-00-111-3430
NSN 5945-00-886-2290
NSN 6650-00-834-9062
NSN 5930-01-226-0768