We can produce various kinds of construction machinery cylinders. The specifications and types can meet the requirements of over 70 kinds of excavators such as KOMATSU, KOBELCO, HITACHI, KATO, SUMITOMO, CAT, etc. and over 20 kinds of bulldozers like KOMATSU, CAT. In addition, we can design and produce hydraulic cylinders according to customers' requirements. The cylinder liners are made of cold drawn seamless steel tubes with strong honing technique. The cylinder length can reach up to 3 m with diameters from f40 to f400. The piston rods are made of chrome steel with special heat treatment. The unionizing technique is applied to the surface, which makes it high in smooth finish with tough inside and hard outside. The piston rods' diameters are from f5 to f140, equipped with quality NOK seals. The quality of our cylinders is guaranteed by the test of high-pressure test bed.