5" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$15.99PriceOut of StockComplete Class 150 flange bolt kit for 5" ASME B16.5 flanges. Contents: (8) 3/4"-10 × 3-1/4" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (8) 3/4"-10 Zinc Finish Hex Nuts.