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 5855-01-162-5251
NSN 6105-01-061-5471
NSN 5895-01-246-2475
NSN 5905-01-088-1440
NSN 6110-01-114-0175
NSN 5920-01-069-4999
NSN 5985-01-377-2599
NSN 7035-01-064-6048
NSN 6110-01-534-2742
NSN 5925-00-830-8148
NSN 5990-01-507-7495
NSN 6145-01-510-5322