... , design, production&marketing, assembly and testing.The authority and our company long time testing comparison, the quality exceeds DADCO, KELLAR ... nitrogen gasCharge pressure25bar~180barOperating temperature0°C~80°CWorking frequency6-40 times per minutesurface roughnessless than 0.02umsurface hardness≥1000HVService ... Initial Force (N) TU150 10,16,25,38,50,80 1700TU250 10,12.7,16,25,38.1,50,63.5,80, ...