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 19/32 in Lock Type Nylon Insert Dimensional Standards ASME B18.16.6 System of Measurement Inch Hex Type Standard Hex Thread Direction Right Hand Insert Material Nylon Minimum Yield Strength 90 000 psi Pack Size Small Pack Resistance Properties Chemical Resistant Impact Resistant Temperature Resistant Vibration Resistant Rockwell Hardness RC 32