Over the years, Fastco has used a wide range of carbon, alloy, and stainless steels. Carbon steels range from 1008-1045 and include 1541 and 10b21. Alloy steels commonly utilized in manufacturing include 4140, 4135, and 4037. Stainless applications include 302 HQ, 304, and 410. In addition, for many years Fastco has produced components for exhaust flange applications that utilize both A286 (ASTM 660) and 431 grades of stainless steel. Fastco’s access to a wide range of materials allows it to support its customer’s unique applications.