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 7035-00-991-6877
NSN 6620-01-391-7331
NSN 5990-01-544-0364
NSN 5905-01-354-7234
NSN 5998-01-012-3273
NSN 7035-01-521-6177
NSN 6320-01-547-2743
NSN 5910-00-701-9172
NSN 6620-01-283-6961
NSN 6610-01-287-9814
NSN 6685-01-634-0611
NSN 5985-01-196-6144