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 5895-00-410-3772
NSN 5975-01-588-5437
NSN 5905-01-045-9498
NSN 5895-01-183-6550
NSN 5960-00-481-6677
NSN 5855-01-285-3483
NSN 5905-00-201-0513
NSN 5950-00-528-9293
NSN 5930-01-566-3501
NSN 5905-00-816-7581
NSN 7035-00-104-7613
NSN 6650-01-010-6662