... seal components: NOK 4.usage:oil 5.application:machinery 1,about HAT60(55-7)two-way hydraulic arm cylinder body ... improve rust proofing and wear and scar resisting performancecertifications:1,ISO9001:2008 2,ISO14001:2004 3,CEContract Manufacturing:OEM ... oil cylinder,excavator oil cylinder and other oil cylinder for engineering machinery,special vehicle,harbour machinery,petroleum and Maritime ...