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 6685-00-894-3239
NSN 5996-01-452-5350
NSN 5950-01-135-2935
NSN 5895-00-188-3350
NSN 6105-00-371-8159
NSN 4140-01-194-4101
NSN 6220-01-317-4389
NSN 6130-01-429-8442
NSN 5910-01-562-3887
NSN 5975-00-341-3913
NSN 5945-01-133-6985
NSN 5915-01-442-9810