Low Carbon Steel. Economical for use in non-critical applications where the fastener is not subject to extreme temperatures or stress.
Grade - 5
Medium Carbon Steel, Quenched and Tempered. Has greater tensile strength than a Grade-2. Yield-to-tensile ration is the lowest of all heat-treated steels.
Grade - 8
Medium Carbon Alloy Steel, Quenched and Tempered. Has greater tensile strength than a Grade-5. Designed for use in high stress applications.
