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 5998-00-435-8377
NSN 5965-01-386-7134
NSN 7035-00-145-9138
NSN 6105-01-332-7691
NSN 5835-01-386-4027
NSN 6220-01-007-1912
NSN 5960-00-645-8435
NSN 6150-00-115-9537
NSN 5965-00-898-1356
NSN 5985-00-862-8110
NSN 5895-01-444-1387
NSN 6610-01-044-1860