SP Foundry is the foundry to contact if you are looking for ductile iron castings and gray iron castings from 25 to 1,500 pounds. We produce quantities from 25 to 5,000 pounds and have two molding lines—14/14 flasks, 28”x40”, 500 molds daily; 22/22 flasks, 44”x56”, 100 molds daily.