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 5960-00-827-6945
NSN 6105-01-339-4318
NSN 5999-00-006-9278
NSN 5945-01-067-7955
NSN 6620-01-595-7459
NSN 5895-01-555-7879
NSN 6130-01-089-0061
NSN 6220-01-460-4579
NSN 5950-00-467-0075
NSN 5985-01-240-9026
NSN 5905-01-506-9949
NSN 6150-00-171-9455