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Jessica's FAQs

What is the Difference Between Type 1 and Type 3 Structural Bolts?

The ASTM F3125 specification covers heavy hex structural bolts including Grades A325 and A490. Both grades include Type 1 and Type 3 options. Tension control bolts in Grades F1852 and F2280 are also available in both Type 1 and Type 3. What is the difference? Type 3 bolts are made from weathering steel designed to eliminate... Read more

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