ISO6431 Standard Good quality Pneumatic Cylinder---SI series ISO6431 Standard CylinderFeatures: 1.Standard design, simple structure, low starting pressure, smooth motion. 2.Adjustable cushion on both cylinder end covers to make sure the cylinder works very smoothly, safety and with low noise. 3.Wide range for sizes 4.With self-lubricating bearing, the piston rod is lubrication free. ...