MS21042L3 - Nut - Self-Locking - Reduced Hex, Reduced Height - 450 Degree - Jet - 10-32 - Black Moly Coating (alt part # MS21040L3, NAS679A3, NAS1021A3, NAS1022A3, NAS1291-3)

A special type of all metal sef-locknut that is commonly used in aerospance and racing. They are widely used in limited space applications where wrench access can be a problem. On average, these lock nuts are 63% lighter than average AN365 nylon nuts and withstand temperatures to 450 degrees. Thread size is 10-32 and hex size 1/4". Coated in black moly film lube.