A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.
NSN 6220-01-012-8535
NSN 6220-01-072-5426
NSN 5930-01-197-8115
NSN 5990-00-212-4316
NSN 5998-01-360-6584
NSN 5990-00-810-3969
NSN 5945-01-343-4716
NSN 5996-00-114-1799
NSN 5895-01-285-2482
NSN 7035-01-203-8010
NSN 5975-01-548-0528
NSN 5835-00-825-2512