5/16-18 x 3 1/4A307A Hex Tap Bolt Zinc Plated
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5/16-18 x 3 1/4Grade 2 Hex Tap Bolt Zinc Plated . A307 or Grade 2 Hex Tap Bolts are manufactured from low carbon steel. Our hex tap bolts meet our exceed ASTM A307 Grade A. All material is manufactured with rolled threads. Zinc plated material meets or exceeds ASTM F1941. Hot-Dip Galvanized material meets or exceeds ASTM A153. Typical hardness will range from HRB 69-100 and tensile strength will meet a minimum 60,000 psi.