Hex Nut Hex Type Heavy Hex Finish Black Oxide Material Grade/Class Grade 2H Material Steel Thread Size 1 3/8 In.-8 Hex Width 2 3/16 in Hex Height 1 11/32 in Material Quality Standards ASTM A194 System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Removable Yes Rockwell Hardness C24 to C38 Thread Type Coarse/8UN