Profile: Ningbo AirTop Pneumatic Hydraulic Co., Ltd. specializes in manufacturing pneumatic and hydraulic components. We are an ISO 9001:2000 and CE certified company. Our products include pneumatic cylinders, directional valves, air treatment units, solenoid valves, hydraulic components, coaxial cables, mechanical valves, power cables, telephone wires, speaker cables and pneumatic accessories. Pneumatic cylinders are acting components which are controlled by directional valves. We have a wide range of cylinders, from standard to non-standard, with bore size ranges from 6 mm to 600 mm. We offer ISO 6431 standard cylinder and ISO 6432 mini cylinder mainly for the international market. We also have ADVU series compact, double shaft, guided, slide, needle and square cylinders. We manufacture the key parts of the cylinders, from die-casting, aluminum profile precision draw, machining, castings, shot blasting, air tightness assurance through the impregnation by vacuum pressure process and passivation treatment, aluminum profile surface oxidation treatment, to assembling & testing, for better quality control. The cylinder covers, piston and piston rods are CNC machined to ensure stability & safety. Our DNC/SI series cylinders are manufactured according to ISO 6431 standard, with the bore size from 3 2mm to 100 mm. We also design cylinders according to our customers' requirements and specifications.