Grade 8 hex cap screws, course thread, have a minimum tensile strength of 150,000 psi. They have a rockwell hardness of c33-c39, exceeding SAE J429, ASTM, ANSI, GM, FORD, and CAT speficications. Roll threaded to a class 2-A thread fit, yellow zinc Dura-Plated for added corrosion protection and head marked with the manufacturers symbol and with 6 radial lines as shown below. Certifications and destructive test results available upon request. 5/16" diameter by 1/2" length.
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