Industrial-Grade Hydraulic Cylinder Piston Rod

This industrial-grade piston rod is a precision-ground cylindrical component designed for use in hydraulic cylinders. It serves as the primary force transmission element, converting hydraulic fluid pressure into linear mechanical motion. Manufactured from chromium-molybdenum alloy steel, the rod features a hard chrome plating that enhances wear and corrosion resistance. The rod's dimensional accuracy and surface finish are critical for cylinder efficiency, seal longevity, and overall system reliability. Available in diameters from 20 to 100 mm and lengths from 500 to 6000 mm, the rod is offered in material grades such as 45# and 42CrMo, with tensile strength ranging from 600 to 900 MPa and yield strength from 355 to 750 MPa. Surface hardness is specified at 50–60 HRC, and chrome plating thickness is 20–50 μm. Straightness tolerance is 0.05–0.10 mm/m, and surface roughness is Ra 0.2–0.4 μm. Operating temperature range is -20 to 80°C. Weight varies from 2.5 to 370 kg depending on dimensions. These specifications are reference values; actual model-specific parameters must be verified with the manufacturer or supplier. The rod is intended for use in general-purpose machinery manufacturing, where precise linear actuation is required. Proper selection involves matching rod diameter to cylinder bore, considering load requirements, environmental conditions, and seal compatibility. Verification of compliance with standards such as ISO 6195, ISO 18265, ISO 1101, ISO 6158, ISO 6892-1, GB/T 699, GB/T 3077, and ISO 1302 is recommended. Maintenance signals include visible wear, scoring, or corrosion on the rod surface, which may indicate seal failure or contamination. Failure boundaries include exceeding yield strength, which can cause permanent deformation, or operating outside the temperature range, which may affect seal integrity. Always consult the legal manufacturer for application-specific guidance.

The piston rod transmits hydraulic pressure as linear force through a sealed piston assembly. When hydraulic fluid is pressurized, it acts on the piston, which is connected to the rod. The rod extends or retracts, converting fluid pressure into mechanical motion. The rod's surface finish and hardness ensure smooth operation and minimal friction with seals, while the chrome plating protects against corrosion and wear. The rod's straightness and dimensional accuracy are essential for maintaining proper alignment and preventing premature seal wear.