Used to Fasten Bolts, Machine Screws, Threaded Rods or any other item with standard machine threading. Item Code Size Box QTY HNBC-03 10-24. 100 HNBC-04 1/4-20. 100 HNBC-05 5/16. 100 HNBC-06 3/8. 50 Categories: Fasteners Hex Nuts Nuts Additional information Additional information Head Type Hex