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The RRH series from RIVERLAKE is a high-performance range of double-acting hollow hydraulic cylinders designed for demanding tensioning, pushing, and pulling applications. Combining robust construction with advanced surface treatments and intelligent safety features, these cylinders deliver exceptional reliability, operational speed, and long service life in harsh industrial environments. • Advanced Surface Treatment – The cylinder body, piston, and stop ring undergo a gas nitriding + post-oxidation process, providing excellent wear resistance, self-lubrication, and superior corrosion protection. • Topcoat Painting – A final paint coating enhances visual identification and further improves overall corrosion resistance. • Overload Protection – An integrated relief valve protects the cylinder from damage in the event of overload. • External Ring Thread – Facilitates easy installation (except for models RRH1001，RRH1508,RRH2308,RRH4008 and RRH6008). • Double-Acting Operation – Enables rapid retraction, significantly improving work cycle efficiency.