MS21042L6 - Nut - Self-Locking - Reduced Hex, Reduced Height - 450 Degree - Jet - 3/8-24 - Black Moly Coating (alt part # MS21040L6, NAS679A6, NAS1021A6, NAS1022A6, NAS1291-6)

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 3/8-24 and hex size 7/16". Coated in black moly film lube.