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 6105-01-487-3156
NSN 6320-00-174-1362
NSN 6220-00-775-7498
NSN 5920-01-417-4396
NSN 5985-00-578-7740
NSN 6135-00-318-8359
NSN 5996-01-578-6955
NSN 6650-01-448-3192
NSN 6645-00-679-8203
NSN 5996-00-472-5387
NSN 6650-00-445-1427
NSN 5998-00-887-6540