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 5935-01-010-3004
NSN 6650-01-512-9650
NSN 5965-01-332-6693
NSN 6685-01-467-4166
NSN 6685-01-452-3263
NSN 6685-00-821-0798
NSN 7035-01-026-1171
NSN 5950-00-104-7526
NSN 6645-01-099-6887
NSN 2925-00-858-0949
NSN 4140-00-597-5260
NSN 7035-00-574-4223