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 5835-01-568-7796
NSN 6620-01-431-0706
NSN 5920-01-573-8468
NSN 6240-01-520-6925
NSN 5950-01-588-7264
NSN 6220-01-471-7058
NSN 5998-00-145-1792
NSN 5915-00-835-0769
NSN 6645-00-408-7443
NSN 6610-01-633-8931
NSN 5905-00-728-6181
NSN 6150-01-061-5129