Hydraulic cylinder piston, usually withstand the force along the cylinder axis, in addition to bear the radial force from cylinder rod. Therefore, the piston of each size the need to be strictly compliance with the design requirements, especially seal groove size and surface roughness of security piston .
Universal piston, standard seal kit is fully applicable to it, we can mass production of such piston, outside diameter from Φ30.5 to Φ147.5.
Specially designed seal piston  to meet the different requirements.
Pistons do not only play a roll of push forward load, but also complete the buffer function of kinetic energy.