Grade 8 Hex Cap Screws

Grade 8 hex cap screws are the choice for demanding jobs such as suspension, heavy equipment and high-load brackets, where Grade 5 is not enough. They are made to SAE J429 Grade 8 from medium carbon alloy steel that is quenched and tempered for higher strength. You can identify Grade 8 by the 6 radial lines on the hex head. Choose coarse (UNC) or fine (UNF) threads in full and partial thread lengths, with yellow zinc or plain finishes. To compare grades, see Grade 5 vs Grade 8 bolts. Use the wrench and socket size chart to match your tools, and the Grade 8 torque chart or the bolt torque chart for installation guidance. Shop by finish: yellow zinc or plain, or browse all hex cap screws.