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 5996-01-492-1695
NSN 6650-01-380-9424
NSN 5950-01-408-5178
NSN 6610-01-576-8955
NSN 5996-00-060-3289
NSN 5985-01-483-5425
NSN 6220-00-737-4872
NSN 5975-01-373-7679
NSN 6105-00-670-6018
NSN 6620-01-027-8379
NSN 7035-01-322-8180
NSN 5998-00-862-5511