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 6645-01-622-1830
NSN 5996-00-248-7061
NSN 5998-00-473-2035
NSN 5998-01-441-9315
NSN 5985-01-615-1796
NSN 5975-00-967-3090
NSN 6620-00-592-2150
NSN 2925-00-210-3873
NSN 5950-01-361-8109
NSN 6650-01-504-8456
NSN 5996-00-258-9184
NSN 5990-01-134-7756