HQS26SD40N70T Rexroth HQS 140H 70H CD210 Hydraulic Cylinder

Product Overview

The HQS26SD40N70T High Pressure Piston Hydraulic Cylinder is a heavy-duty, industrial-grade actuator engineered for high-load, continuous-duty hydraulic applications. It is built for 100% direct drop-in interchangeability with HQS, 140H, 70H, CDM1MP5, and Rexroth CD210G/CD210B tie-rod and inline high-pressure hydraulic cylinders. Featuring a precision-honed steel cylinder barrel and a high-strength, hard-chrome-plated piston rod, this unit withstands heavy mechanical shock and severe ambient working conditions. Every cylinder undergoes 100% simulated working pressure testing prior to shipment, guaranteeing zero external/internal leakage and ensuring uninterrupted operation in automated manufacturing and heavy equipment.

Technical Specifications

• Model Code: HQS26SD40N70T (Compatible across HQS / 140H / 70H / CDM1MP5 / CD210G / CD210B series)

• Bore Diameter: 40 mm

• Piston Rod Diameter: 26 mm

• Stroke Length: 70 mm

• Nominal Operating Pressure: 14 MPa (140 bar / 70H-140H standard) to 21 MPa (210 bar / CD210 standard)

• Peak Pressure: 25 MPa to 31.5 MPa (250 bar to 315 bar)

• Mounting Type: SD style (Base/Side mount or Tie-Rod connection conforming to ISO 6020/2 and DIN standards)

• Fluid Compatibility: Mineral oil-based hydraulic fluids, water-glycol (depending on seal package)

• Seal Package: High-durability Polyurethane (PU) / Viton (FKM) combination seals

• Operating Temperature Range: -20°C to +120°C

• Net Weight: Approx. 6.8 kg

Key Technical Advantages

• 100% Drop-In OEM Interchangeability: Envelope dimensions, mounting centerlines, rod end threads, and port configurations match OEM drawings precisely, allowing effortless direct mounting without machinery alteration.

• Precision-Engineered Tube & Chrome Rod: Super-finished cylinder barrel interior ($Ra < 0.2\ \mu\text{m}$) combined with induction-hardened, chrome-plated piston rod ($\ge 25\ \mu\text{m}$ thickness) prevents premature seal wear and offers maximum corrosion resistance.

• Low-Friction Sealing Technology: Specially selected sealing systems eliminate stick-slip behavior at low speeds while maintaining tight containment under intense pressure spikes.

• 100% Factory Pressure Tested: Every unit is subjected to full-stroke dynamic pressure testing and static hold tests under max operating conditions to verify structural integrity and sealing performance.

Application Areas

• Metallurgy & Steel Production: Continuous casting guides, heavy shearing machine clamp cylinders, and automated valve actuators.

• Plastics & Injection Molding: High-pressure mold core-pulling and secondary ejection actuation circuits.

• Machine Tools & Factory Automation: Hydraulic clamping fixtures, metal forming presses, and high-load automated lifters.

• Heavy Machinery & Power Units: Hydraulic power unit (HPU) positioning, mobile equipment attachments, and heavy clamping systems.

Expert Maintenance Tips

• Prevent Side Loading: Ensure precise alignment between the cylinder rod axis and the load path during installation. Excessive side loads accelerate wear on rod bearings and cause seal degradation.

• Fluid Contamination Control: Maintain hydraulic oil cleanliness to ISO 4406 18/16/13 or better. A pressure-line filter should be installed upstream to catch harmful particulate contamination.

• Air Bleeding Procedure: Bleed all trapped air from the cylinder using the port air-bleed screws during initial setup. Operate the cylinder back and forth at low pressure without load for several cycles before applying full working loads.