No other part numbers with same form, fit, and function found.
A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.
NSN 6240-01-654-4388
NSN 6240-00-269-3346
NSN 5975-01-301-4628
NSN 6620-01-643-5531
NSN 5925-01-159-5236
NSN 5990-00-263-1289
NSN 6645-00-704-3630
NSN 6685-01-141-7034
NSN 6150-01-221-5479
NSN 6320-01-388-1067
NSN 6645-01-069-3286
NSN 6145-01-383-7134