Lock Nut Finish Black Oxide Material Steel Material Grade/Class Grade 2 Thread Size 2 1/4 In.-12 Hex Width 3 1/2 in Hex Height 2 1/16 in Lock Type Nylon Insert Dimensional Standards ASME B18.16.6 System of Measurement Inch Hex Type Heavy Hex Thread Direction Right Hand Insert Material Nylon Maximum Temperature 250 Degrees F Pack Size Small Pack Resistance Properties Chemical Resistant Impact Resistant Temperature Resistant Vibration Resistant Rockwell Hardness C32 Max