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Comparison of Shear Strengths of Grade 2, 5 and 8 Screws. The industry standard for determining shear strengths of fasteners is to take 60% of the minimum Ultimate Tensile Strength of the fastener for single shear joints and 120% for double shear joints.
Proof Load Tensile Strength for Grade 2, 5, & 8. Proof Loads and tensile strengths are computed by multiplying the proof load stresses and tensile strengths stresses by the stress area of the thread.
Shear strength is typically 60% of tensile strength, and the minimum tensile strength of a grade 8 bolt is 150,000 psi. We have an FAQ that addresses this question here: https://www.portlandbolt.com/technical/faqs/bolt-shear-strength-considerations
SAE J429 is one of the most common standards for inch fasteners, and Grade 8 is the highest grade within it. Grade 8 bolts are made of medium-strength carbon or alloy steel and can be finished in a variety of coatings and platings for added corrosion resistance and lubricity.
To find the tensile strength of a particular bolt, you will need to refer to Mechanical Properties of Externally Threaded Fasteners chart in the Fastenal Technical Reference Guide. To find the tensile stress area, refer to the Thread Stress Areas chart also in the Guide.
High Tensile is very strong, long-lasting carbon steel, find here the Difference between Grade 8 and 10.9 bolts and studs. Compare composition, mechanical properties, and strength.
Grade 8 bolts: Known their high shear strength and tensile strength, Grade 8 bolts are commonly used in heavy machinery, automotive applications, and structural connections. They’re made from carbon alloy steel, quenched, and tempered for added strength.