A nut having an externally splined sleeve which holds it in position when forced into a hole of slightly smaller diameter.
NSN 5999-01-273-0965
NSN 6685-00-027-7186
NSN 5965-01-319-5363
NSN 5910-01-469-2463
NSN 2925-01-500-3300
NSN 5910-01-189-0731
NSN 5920-00-443-4653
NSN 5910-01-176-6476
NSN 6610-01-523-2958
NSN 5895-00-686-2029
NSN 6110-00-111-2761
NSN 7035-00-849-5526