Lock Nut Finish Zinc Plated Hex Height 21/64 in Hex Type External Tooth Lock Washer Hex Width 1/2 in Lock Type Lock Nut with External Tooth Lock Washer Material Steel Material Grade/Class Grade 2 Pack Size Small Pack Rockwell Hardness - System of Measurement Inch Thread Direction Right Hand Thread Size 5/16 In.-18 Package Quantity 100