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 5950-01-567-9158
NSN 5915-01-237-3491
NSN 5990-00-067-6791
NSN 5855-00-821-7512
NSN 5835-01-171-9126
NSN 5985-01-092-5936
NSN 5999-01-355-0325
NSN 5975-01-545-5453
NSN 5945-01-412-1393
NSN 6645-01-056-9296
NSN 5950-00-094-1031
NSN 2925-00-278-9468