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 5965-00-900-8102
NSN 6240-01-414-6074
NSN 5975-00-734-6243
NSN 5910-00-993-6875
NSN 5925-01-519-8048
NSN 6645-01-097-5831
NSN 5895-00-919-5498
NSN 7035-00-968-4848
NSN 6220-01-467-5973
NSN 6685-01-110-9248
NSN 5930-01-644-0753
NSN 6220-01-333-1319