18" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$99.99PriceOut of StockComplete Class 150 flange bolt kit for 18" ASME B16.5 flanges. Contents: (16) 1-1/8"-7 × 5" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (16) 1-1/8"-7 Zinc Finish Hex Nuts.