16" Class 150 Flange Bolt Kit ASTM A307 Grade A Zinc$74.99PriceOut of StockComplete Class 150 flange bolt kit for 16" ASME B16.5 flanges. Contents: (16) 1"-8 × 4-1/2" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (16) 1"-8 Zinc Finish Hex Nuts.