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 6240-00-045-9844
NSN 5998-01-103-0660
NSN 6145-01-411-7179
NSN 5910-00-268-8194
NSN 5945-01-649-1372
NSN 6645-01-175-3568
NSN 6645-01-014-2849
NSN 2925-00-964-7128
NSN 5925-01-338-1465
NSN 5945-01-483-1312
NSN 5920-01-430-4365
NSN 5985-01-350-7498