Piston & Rod (Ram) for Hydraulic Systems

Product Specifications

Technical details and manufacturing context for Piston & Rod (Ram)

Definition

In a hydraulic ram assembly, the piston and rod (ram) form the core moving component. The piston, sealed within the cylinder bore, converts hydraulic pressure into linear mechanical force. This force is transmitted directly through the rigid piston rod (or ram) to perform work on an external load. The assembly's integrity is critical for efficient power transfer and precise motion control in hydraulic systems. This component is typically manufactured from hardened alloy steel or chrome-plated steel, with material grades such as 45# carbon steel and surface treatments like hard chrome plating (Cr-plated) for wear resistance. Standard dimensions follow ISO 6020-2, with bore diameters ranging from 40 to 320 mm, rod diameters from 20 to 220 mm, and stroke lengths from 50 to 6000 mm (custom lengths available). Operating pressure is typically 1.0 to 1.6 MPa, with a maximum pressure of 25 MPa. Operating temperature ranges from -20°C to 80°C, limited by seal materials. Surface roughness is specified at 0.2 to 0.4 µm Ra (ISO 1302), and cylindricity tolerance is 0.01 to 0.02 mm (ISO 1101). Weight varies from 5 to 500 kg depending on size and material. These parameters serve as reference ranges for selection and verification. Actual values must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards listed (ISO 6020-2, ISO 1302, ISO 1101, GB/T 699, GB/T 11379) are procurement references, not proof of certification or compliance. Always verify model-specific values and standards before purchase or integration.

Working Principle

Hydraulic fluid under pressure acts upon the piston's surface area, generating a linear force (Force = Pressure × Area). This force pushes the piston, and the attached solid rod transmits this push/pull force in a straight line to the machine tool, press platen, or other actuated element. The rod must be rigid and precisely aligned to avoid bending or excessive wear. The piston's seals prevent fluid leakage and maintain pressure integrity. The assembly converts hydraulic energy into controlled mechanical motion, enabling precise positioning and force application in industrial machinery.

Common Materials

Hardened alloy steel, Chrome-plated steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	40–320 mm	Standard sizes; custom diameters available.ISO 6020-2
Rod Diameter	20–220 mm	Must match bore and pressure rating.ISO 6020-2
Stroke Length	50–6000 mm	Custom lengths up to 6000 mm.
Operating Pressure	1.0–1.6 MPa
Maximum Pressure	25 MPa	Peak pressure without permanent deformation.ISO 6020-2
Operating Temperature	-20–80 °C	Seals limit temperature range.
Surface Roughness	0.2–0.4 µm Ra	Critical for seal life and friction.ISO 1302
Cylindricity	0.01–0.02 mm	Ensures even load distribution.ISO 1101
Material Grade	45#	High-strength carbon steel; alternatives available.GB/T 699
Surface Treatment	Cr-plated	Hard chrome plating for wear resistance.GB/T 11379
Weight	5–500 kg	Depends on size and material.

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

Piston Head Part
Seals against the cylinder bore and provides the surface area for hydraulic pressure to act upon.

Material: Hardened alloy steel with piston rings/seals
Piston Rod (Ram) Part
A solid shaft that connects the piston to the external load, transmitting the linear force.

Material: Chrome-plated steel for hardness and corrosion resistance
Rod End Part
The terminus of the rod, often threaded or with a clevis, for attaching to the machine load.

Material: Alloy steel
Piston Seals
Seal the piston against the bore; they are what holds the pressure and the main wear item.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hydraulic Ram Assembly

View system integration details

Manufacturers of Piston & Rod (Ram)

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Frequently Asked Questions

What materials are commonly used for piston and rod assemblies?

Common materials include hardened alloy steel and chrome-plated steel. Material grade 45# (high-strength carbon steel) is listed, with hard chrome plating (Cr-plated) for wear resistance. Confirm exact material with the supplier.

What are the typical bore and rod diameter ranges?

According to ISO 6020-2, bore diameters range from 40 to 320 mm, and rod diameters from 20 to 220 mm. Custom sizes may be available; verify with the manufacturer.

What is the maximum operating pressure?

The listed maximum pressure is 25 MPa, with a typical operating pressure range of 1.0 to 1.6 MPa. Always check the system's pressure rating and seal compatibility.

How does surface roughness affect performance?

Surface roughness (0.2–0.4 µm Ra) is critical for seal life and friction. Smoother surfaces reduce wear and leakage. Verify the specified roughness with the supplier.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 300 bar (4350 psi)
flow rate:	Dependent on cylinder bore and rod diameter
temperature:	-40°C to 120°C
slurry concentration:	Not recommended for abrasive slurries >5% solids by weight

Piston & Rod (Ram)

Product Specifications

Applied To / Applications

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Application Fit & Sizing Matrix

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