... ,Iair cylinder pistonSO 6431,DNC,MB air cylinder pistonOur advantage:1:Ending cover and piston made by aluminium-alloy for pneumatic ... cylinder ,ISO 6431,DNC,MB,DNG,SC,,SU,TN,STM,CK diameter form 32mm~320mm2:Surface treatment ... different kind mold according to customers request!! die casting parts SC piston for air cylinder(air cylinder piston)