Midwest Fastener 9/16″-18 Zinc Plated Fine Thread Castle Hex Nuts – 87603 – Bolts

Product Features:

• A castle nut is a hex nut with slots (notches) cut into one end. The slots allow for a cotter pin to be installed between them and through the bolt/stud the nut is being threaded onto. The cotter pin prevents the nut from working loose. Often found in automotive applications like ball joints and tie rod ends.
• Item Type: Castle Nut
• Thickness: 39/64″
• Drive Type: 7/8″ Wrench
• Thread Size: 18
• Thread Type: Fine
• Material: Steel
• Finish: Zinc