api 5000PO BOX 639 • Bakersfield, CA 93302 855-535-1555 phone • sales@ API FLANGE BOLT & RING CHART API Pressure Rating Flange Size & BoreThe Api 5000 Flanges are manufactured using carbon steel or alloy steel, and they help to join pipes or block a section of the piping system. Api 10000 instrument flanges is of ring type joint