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 6135-01-397-2170
NSN 6650-00-162-0951
NSN 6610-01-242-9674
NSN 6145-00-765-4280
NSN 5975-01-573-5280
NSN 5999-01-525-7937
NSN 6105-01-594-2251
NSN 6240-00-518-3541
NSN 5920-01-521-6928
NSN 6220-00-349-2594
NSN 6685-01-275-3973
NSN 5855-00-472-2055