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 4140-01-201-4359
NSN 5950-00-526-0658
NSN 5895-01-319-1859
NSN 5996-00-452-0312
NSN 6220-00-458-4633
NSN 6220-01-013-4559
NSN 6610-00-348-8556
NSN 6645-01-463-3441
NSN 5996-01-447-4276
NSN 5965-01-364-3002
NSN 5965-00-420-9203
NSN 5835-00-001-5456