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3/8-16 X 1 Hex Flange Bolt Grade 8. This bolt is identifiable by the ridge or surrounding the bolt head. This built-in washer under the head of the Bolt acts to distribute the clamping load over a greater area. A flange bolt is designed to provide the same holding power as a washer. Grade 8 has a greater tensile strength than Grade 5. Wrench Size: 9/16" Head: Hex Grade: 8 Thread Size: 16 Finish: Phosphate and Oil Diameter: 3/8" Material: Steel Specification: SAE J429 Thread Type: Full Thread Thread: Coarse Type: Flange Bolt Length: 1" Fastenal Manufacture Number 0142772.