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 6220-00-840-0209
NSN 5990-01-078-1294
NSN 5998-00-087-8000
NSN 6645-00-152-6545
NSN 5895-00-525-3295
NSN 4140-01-561-5099
NSN 6105-00-372-4716
NSN 5910-01-198-5433
NSN 5915-01-442-6484
NSN 6105-01-503-0187
NSN 6240-00-021-1296
NSN 4140-00-972-2820