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 5855-01-359-0373
NSN 5998-00-376-5506
NSN 4140-01-647-3087
NSN 6620-01-016-8264
NSN 5950-01-619-8592
NSN 6105-01-469-6027
NSN 5855-00-688-9954
NSN 5910-01-143-2447
NSN 6105-01-061-5471
NSN 5925-01-305-2594
NSN 5950-01-380-8556
NSN 5920-01-064-3723