C110/A21.10-82: American National Standard for Ductile-Iron and Gray-Iron Fittings, 3 In. Through 48 In., for Water and Other Liquids (PDF)

This standard covers 3- to 48-in. gray iron and/or ductile iron fittings to be used with gray iron or ductile iron pipe for water and other liquids. Specifications for fittings with mechanical and flanged joints are listed in tables at the end of the standard. The standard may also be used for fittings with push-on joints or such other joints as may be agreed upon at time of purchase. For the 3-24 in. size range, ductile iron mechanical joint fittings are rated for 350 psi (2.41 MPa) working pressure; ductile iron flange-joint fittings are rated for 250 psi (1.72 MPa) working pressure; and gray cast iron fittings having all types of joints covered by the standard are rated for 150 or 250 psi (1.03 or 1.72 MPa) working pressures, as shown in tables. For the 30-48 in. size range, fittings of all types of joints covered by this standard are shown in the tables as gray iron and/or ductile iron for rated working pressures of 150 or 250 psi (1.03 or 1.72 MPa), as shown in tables.