12" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$68.00PriceQuantity*Add to CartBuy NowComplete Class 150 flange bolt kit for 12" ASME B16.5 flanges. Contents: (12) 7/8"-9 × 4" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (12) 7/8"-9 Zinc Finish Hex Nuts.