Drawing No. : LSD8604-00-00 Main Features :(a)Composite piston with steel crown and iron skirt ,shake cooling ,piston skirt adopt convexity change to ellipse line .(b)Central single bolt , nut , flat mat , dish mat connecting structure . (c)This piston is suitable for Beijing style , DF7 locomotives . 240/260 Composite Piston with Steel Crown and Aluminum Skirt