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 5835-01-084-6997
NSN 4140-01-485-3321
NSN 6220-00-865-8069
NSN 4140-01-009-2921
NSN 5965-01-422-1392
NSN 5998-01-643-0939
NSN 5930-01-080-6580
NSN 6685-01-411-5969
NSN 5950-00-833-9863
NSN 5855-01-145-8973
NSN 5920-01-148-7625
NSN 2925-01-149-0352