... all kind size and mounting type, for tower crane 1. Mounting type: trunnion, flange, earring, according to your demand;2. seal: Parker ... frequency quenching;4. buff function: you can choose to design with adjustable buff to avoid impact of cylinder;5. size: bore:20-500mm ... you can also send us sample and we produce for you according to your sample.1. Mounting type: trunnion, flange, earring, according ...