Precision Hydraulic Cylinder Piston Rod

Product Specifications

Technical details and manufacturing context for Precision Hydraulic Cylinder Piston Rod

Definition

A precision-machined cylindrical component that serves as the force-transmitting element in hydraulic cylinders. It converts hydraulic pressure into linear mechanical motion through its reciprocating movement within the cylinder barrel. This critical component is essential in industrial machinery, construction equipment, and manufacturing systems where controlled linear force is required. Its dimensional accuracy and surface finish directly impact system efficiency, seal integrity, and overall equipment reliability in B2B industrial applications. The rod is typically manufactured from chrome-plated steel, stainless steel, or hardened alloy steel, with material grades such as 45# or 40Cr per GB/T 699. Key parameters include a rod diameter of 20–100 mm (ISO 6020-2), surface hardness of HRC 50–60 (ISO 18265), straightness tolerance of 0.05 mm/m (ISO 1101), chrome plating thickness of 20–50 μm (ISO 6158), thread specification M20x1.5–M80x3 (ISO 68-1), maximum working pressure of 16–25 MPa (ISO 3320), surface roughness Ra 0.2–0.4 μm (ISO 1302), tensile strength 600–900 MPa (ISO 6892-1), yield strength 355–785 MPa (ISO 6892-1), operating temperature -20 to +80 °C (ISO 5598), and weight per meter 2.47–61.7 kg/m. These values are reference ranges for directory purposes and must be verified for the specific model and application with the legal manufacturer or supplier. The rod's performance is critical for seal life and system efficiency; proper selection requires consideration of load, speed, environmental conditions, and compatibility with seals and other components. Maintenance signals include visible wear, scoring, corrosion, or leakage around seals. Failure boundaries include exceeding maximum working pressure, operating outside temperature limits, or exceeding straightness tolerance, which can lead to seal failure and system malfunction.

Working Principle

The piston rod moves linearly within the cylinder barrel, transmitting hydraulic pressure from the piston to external loads while maintaining alignment and seal integrity. As hydraulic fluid is pressurized on one side of the piston, the rod extends or retracts, converting fluid pressure into mechanical force. The rod's surface finish and hardness ensure low friction and wear resistance, while its straightness and dimensional accuracy maintain proper seal contact and prevent leakage. The rod's end connections, typically threaded, interface with the load or machine structure. Proper alignment and lubrication are essential to prevent side loading and premature seal wear.

Common Materials

Chrome-plated steel, Stainless steel, Hardened alloy steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rod DiameterRequired	20–100 mm	Precision ground diameter for seal compatibilityISO 6020-2
Surface HardnessRequired	HRC 50–60 HRC	Hardness rating for wear resistanceISO 18265
Straightness ToleranceRequired	0.05/1000 mm/m	Maximum deviation from perfect straightnessISO 1101
Chrome Plating ThicknessRequired	20–50 μm	Corrosion-resistant chrome layer thicknessISO 6158
Thread Specification	M20x1.5–M80x3 Mxx	Standard thread size for end connectionsISO 68-1
Maximum Working PressureRequired	16–25 MPa	Maximum hydraulic pressure ratingISO 3320
Material Grade	45# or 40Cr -	High-strength alloy steelGB/T 699
Surface Roughness	Ra 0.2–0.4 μm	Affects seal lifeISO 1302
Tensile Strength	600–900 MPa	Depends on material and heat treatmentISO 6892-1
Yield Strength	355–785 MPa	Minimum for plastic deformationISO 6892-1
Operating Temperature	-20–+80 °C	Seals limit rangeISO 5598
Weight per Meter	2.47–61.7 kg/m	Calculated from diameter and density

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Rod Body Part
Primary force-transmitting structure

Material: Hardened steel core
Chrome Plating Part
Corrosion and wear resistance surface layer

Material: Electrodeposited chromium
Threaded End Optional Part
Connection interface for load attachment

Material: Machined steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Precision Hydraulic Cylinder Piston Rod.

Manufacturers of Precision Hydraulic Cylinder Piston Rod

Manufacturer profiles associated with Precision Hydraulic Cylinder Piston Rod.

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Frequently Asked Questions

What materials are commonly used for piston rods?

Common materials include chrome-plated steel, stainless steel, and hardened alloy steel. Material grades such as 45# or 40Cr per GB/T 699 are often specified. The choice depends on the application's corrosion resistance, strength, and wear requirements.

What are the typical diameter and pressure ratings?

Rod diameters typically range from 20 to 100 mm, and maximum working pressure is 16 to 25 MPa. These values are reference ranges; the exact specifications must be confirmed with the manufacturer for the specific model and application.

How does surface finish affect performance?

Surface roughness (Ra 0.2–0.4 μm) is critical for seal life and low friction. A smoother finish reduces wear on seals and rod surface, while a rougher finish can cause premature seal failure and leakage.

What maintenance signals indicate a problem?

Signs include visible scoring, corrosion, pitting, or leakage around the rod seals. Increased friction or unusual noise during operation may also indicate wear. Regular inspection and measurement of straightness and surface condition are recommended.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 5000 psi (345 bar)
flow rate:	Dependent on cylinder bore and rod diameter
temperature:	-40°C to 200°C
slurry concentration:	Not recommended for abrasive slurries >5% solids by volume