20" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$129.99PriceOut of StockComplete Class 150 flange bolt kit for 20" ASME B16.5 flanges. Contents: (20) 1-1/8"-7 × 5-1/2" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (20) 1-1/8"-7 Zinc Finish Hex Nuts.