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 6650-01-390-1674
NSN 5950-01-458-9745
NSN 6650-01-232-8975
NSN 5920-01-152-1949
NSN 5960-01-452-1907
NSN 5998-01-202-8266
NSN 6130-00-017-2137
NSN 5945-00-190-4185
NSN 7035-01-007-1802
NSN 7035-01-093-9544
NSN 6220-01-485-2381
NSN 5920-01-191-9847