Ensure your semi truck is Ready for the Road Ahead with properly secured components, with the Fastenal 1/2"-13 x 4" Steel Hex Cap Screw. With a specially-designed washer face under the head and a chamfered point, this replacement bolt is the ideal option to snap and lock various components together. Built with yellow zinc to provide enhanced corrosion resistance. FleetPride is your First Click in Heavy Duty .