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1/4" -20 x 1" Grade 5 zinc finish hex cap screw. Hex head cap screws are designed for easy assembly into a tapped hole. Grade 5 is the most common grade and zinc reduces the corrosion rate in a normal atmosphere. Tensil strength: 120,000 psi minimum Wrench size: "7/16" Material: Steel Fastenal Manufacture Number: 13005