These custom grade 5 hex nuts were manufactured using SAE J995 steel material for an agricultural equipment operator, with black oxide finish.  Width across the flats was set to .551-.563″ and the height was specified at .401-.402″.  The internal thread pitch was the oddest part for the custom nut, with a 3/8-20 pitch and 2B thread fit.  Full certs were provided with the parts.