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A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch. We recommend using grade 8 nuts, flat washers and high alloy lock washers with any grade 8 bolts / hex cap screws.

5/16-18 X 2-3/4 Grade 8 Hex Head Cap Screw Plain Finish - Package of 50

5-16-18-x-2-3-4-hex-head-cap-screw-steel-plain-unc-grade-8-usa-100-pack-452092

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