These bolts feature a square head design for use in heavy-duty applications. Grade 5 Steel construction is quenched and tempered to be hard and durable. However, the grade 5 bolts are more malleable than Grade 8, allowing them to better withstand shear force. Grade 5 Steel Square Head Bolts are the UNC equivalent of Metric Class 8.8 Steel Square Head Bolts.
These bolts feature Class 8.8 construction. They are hard and durable, yet slightly more malleable than Class 10.9 steel bolts, allowing them to better withstand shear force. Class 8.8 Steel Square Head Bolts are the Metric equivalent of UNC Grade 5 Steel Square Head Bolts.
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