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 6685-00-671-9329
NSN 2925-01-101-0463
NSN 5975-00-767-0976
NSN 6650-00-166-7160
NSN 5985-01-370-1337
NSN 6130-01-540-9785
NSN 6150-01-411-5216
NSN 6610-00-225-5857
NSN 5895-01-500-1264
NSN 6135-00-152-8729
NSN 5915-01-511-5371
NSN 6130-00-973-7866