A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.
NSN 7035-01-475-9017
NSN 5835-00-358-4235
NSN 5925-01-435-3766
NSN 5835-01-459-8664
NSN 5835-01-659-5206
NSN 5960-01-473-9203
NSN 5950-01-013-0788
NSN 6650-01-394-2646
NSN 5895-00-104-5982
NSN 5915-01-093-8644
NSN 5935-01-594-0222
NSN 6145-01-481-0131