Lock Nut Finish Zinc Plated Material Steel Material Grade/Class Grade 2 Thread Size 5/8 In.-18 Hex Width 15/16 in Hex Height 25/64 in Lock Type Nylon Insert System of Measurement Inch Hex Type Standard Hex Thread Direction Right Hand Insert Material Nylon Maximum Temperature 250 Degrees F Pack Size Small Pack Rockwell Hardness C28 Max Package Quantity 50