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For help determining what grade of bolt you need see Bolt Grade Markings and Strength Chart.
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Hex bolts
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Stainless steel 18-8
An alloy of steel with high corrosion resistance.
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Zinc plated grade 2 steel
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Zinc plated grade 5 steel
A tempered medium carbon steel. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications. Zinc plated for moderate corrosion resistance.
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Zinc plated grade 8 steel yellow
A tempered medium carbon steel. Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. Zinc plated for moderate corrosion resistance.
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Grade 8 steel plain finish
A tempered medium carbon steel. Grade 8 is stronger than grade 5, and is commonly found in high strength automotive applications. Unplated finish.
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Chrome plated grade 5 steel
A tempered medium carbon steel. Grade 5 falls between grade 2 and grade 8 in strength, and is commonly found in automotive applications. Chrome plated and polished for a mirror like finish.
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Hot dipped galvanized steel
A low carbon steel for general use. Hot dipped galvanized (A153) for very good corrosion resistance.
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