A cylindrical cross section (joint) through which an axis passes. It's connected to a hinge-like item and allows movement.
NSN 5998-00-163-0454
NSN 5965-01-464-3372
NSN 5960-01-103-5476
NSN 6105-00-476-9541
NSN 5965-01-488-6695
NSN 6320-01-212-8749
NSN 6620-01-168-2557
NSN 5998-01-203-3823
NSN 6135-00-078-9931
NSN 5960-01-353-3972
NSN 6110-00-246-3941
NSN 5950-01-482-3982