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 6135-00-567-1322
NSN 5965-01-142-7862
NSN 5920-01-226-7876
NSN 5920-01-622-1523
NSN 6220-00-583-9889
NSN 7035-00-631-3782
NSN 6130-01-228-5337
NSN 5950-01-542-5493
NSN 6220-00-525-3195
NSN 6620-01-560-7832
NSN 5965-00-372-2537
NSN 5835-01-200-8932