Lock Nut Finish Zinc Plated Material Steel Material Grade/Class Grade 2 Thread Size 5/16 In.-18 Hex Width 1/2 in Hex Height 1/2 in Lock Type Nylon Insert System of Measurement Inch Hex Type Cap Hex Thread Direction Right Hand Insert Material Nylon Maximum Temperature 250 Degrees F Pack Size Small Pack Rockwell Hardness C32 Max Package Quantity 25