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 5925-00-080-1019
NSN 6130-00-453-9204
NSN 5965-01-085-6158
NSN 5855-01-380-5102
NSN 5895-01-186-6286
NSN 6620-01-406-6840
NSN 5935-01-474-6021
NSN 6320-00-036-3688
NSN 5990-01-056-6413
NSN 5965-01-502-0316
NSN 5925-01-116-8225
NSN 6130-00-900-4758