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 6645-01-188-5237
NSN 6135-01-520-4670
NSN 2925-00-533-6262
NSN 5960-00-822-6787
NSN 6130-01-200-0358
NSN 5998-01-442-7671
NSN 4140-01-464-3231
NSN 5905-01-410-7780
NSN 6220-00-758-2378
NSN 5999-00-583-7589
NSN 5996-00-865-3513
NSN 5985-01-584-2859