Pi std661 aluminum spiral finned tubes applicated for air cooler and heat exchanger Specifications Bare tube material: (1) carbon steel tube sa179, sa334, sa214, sa106b, gb8163, gb9948, gb3087, 10#, 20#, (2) stainless steel tube sa789, sa213, sa312, sa210, sa249, 304, 316, t11, t22, t91 (3) copper tube c1100, c12200, c44300, c68700, c70600, c71500, cuni90/10, 70/10, 70/20, 70/30 etc. Fin length:130mm~180m Fin od:25mm~82mm Fin/inch: 5-12 Fin thickness: 0.2mm~1mm Fin height: 3mm~16.2mm Fin material: aluminum 1060, 1050, 1070 Fin type: extruded Function (1)energy conservation; (2) long time using; (3) light than steel fin; (4) high heat transfer; Copper c1100, c12200 extruded finned tubes, spiral fin tubes for air condenser and heat exchanger