3" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$8.64PriceQuantity*Add to CartBuy NowComplete Class 150 flange bolt kit for 3" ASME B16.5 flanges. Contents: (4) 5/8"-11 × 3" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (4) 5/8"-11 Zinc Finish Hex Nuts.