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RCH-Series Single-Acting, Hollow Plunger Hydraulic Cylinders feature a hollow bore to apply both pull and push forces. A threaded steel rod can be run through the hollow bore of the cylinder and attached to a load to either push or pull the load, or to apply tension. • Industry-Broadest Bolt Coverage: 15 dedicated load cells eliminate tool swaps across imperial/metric systems. • Extreme Load Capacity: 21,750 PSI max pressure for high-stress flange/structural joints. • Intelligent Over-Stroke Protection: HM01-HM05: Mechanical prevention (spring-free reliability). HM06-HM15: Relief valve + spring assist (controlled release). • HM06-HM15: Relief valve + spring assist (controlled release). • Long-Stroke Efficiency: 15mm (9/16″) stroke maximizes bolt engagement with zero over-extension risk(only HM01 model come with 10mm stroke). • Safety Engineered: Captive socket – eliminates dropped-object hazards. Anti-slip grip – maintains control in oily/offshore conditions. • Anti-slip grip – maintains control in oily/offshore conditions. • Rapid-Release Bridge: Quick-disconnect design accelerates repositioning. • Real-Time Monitoring: Stroke indicator verifies extension accuracy.