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 5998-01-245-7144
NSN 5855-01-454-1538
NSN 5925-01-349-5602
NSN 5925-01-576-9256
NSN 5998-01-451-0346
NSN 5895-01-426-2980
NSN 6130-00-542-6693
NSN 5985-00-127-6712
NSN 5950-01-469-2364
NSN 6150-00-510-7875
NSN 5905-01-167-7420
NSN 7035-01-599-9287