Used to Fasten Bolts, Machine Screws, Threaded Rods or any other item with standard machine threading. Item Code Size Box QTY HN2CG05 5/16-18. 100 HN2CG06 3/8-16. 100 HN2CG08 1/2-13. 50 Categories: Fasteners Hex Nuts Nuts Additional information Additional information Head Type Hex