Lock Nut Finish Zinc Plated Material Steel Material Grade/Class Grade 2 Thread Size 1/4 In.-28 Hex Width 7/16 in Hex Height 5/16 in Lock Type Nylon Insert Dimensional Standards ASME B18.16.6 System of Measurement Inch Hex Type Jam Hex Thread Direction Right Hand Pack Size Small Pack Rockwell Hardness B68 to C32 Package Quantity 100