SPF Ductile Iron Threaded Fittings SPF/MI-1.15 page 1 PS-SUB-3388-v01 20220124 Cored Plug Fig. 3388 Material Specifications Dimensions: ASME B16.14 Material: ASTM A536 Grade 65-45-12 Finish: Black Threads: NPT per ASME B1.20.1 Agency Approvals: All ductile iron threaded fittings are UL/ULC Listed and FM Approved. Pressure - Temperature Ratings in accordance with ASME B16.3 Class 150 Note: Ductile iron fittings have higher tensile strength than that of steel pipe. Therefore, over tightening can cause damage to pipe threads which may cause leakage. Ductile iron fittings should be tightened approximately three turns beyond hand tight, but no more than four turns.