1-1/4" Class 300 Flange Bolt Kit ASTM A307 Grade A Zinc$0.00PriceOut of StockComplete Class 300 flange bolt kit for 1-1/4" ASME B16.5 flanges. Contents: (4) 5/8"-11 × 3-1/4" ASTM A307 Grade A Zinc-Plated Hex Machine Bolts and (4) 5/8"-11 Zinc Finish Hex Nuts.