5/16-18 x 3 Grade 5 Hex Tap Bolt Zinc Plated

5/16-18 x 3 Grade 5 Hex Tap Bolt Zinc Plated . Grade 5 Hex Tap Bolts are made from AISI 1030-1541 or equivalent medium carbon steel. Commonly used to mount motors to machinery and are also popular in automotive and truck repair. Rockwell C25-C34. Proof load – 85,000 psi. Yield Strength – 92,000 psi. minimum. Tensile Strength – 120,000 psi. minimum.