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 2925-00-073-9375
NSN 6150-01-435-5026
NSN 6105-00-535-2630
NSN 5985-01-062-0675
NSN 6105-00-639-6857
NSN 5910-01-212-3090
NSN 4140-01-021-5674
NSN 5965-01-453-1108
NSN 5999-00-847-8030
NSN 5930-01-090-1061
NSN 6220-00-162-5047
NSN 6135-00-519-1325