Cylinder Barrel (Hydraulic): Temperature Range -20°C to +120°C

Component Specifications

Definition

The cylinder barrel is the primary structural component of hydraulic actuators, serving as a pressure vessel that contains hydraulic fluid under high pressure. It provides a smooth, precisely machined internal surface for piston movement, maintains fluid integrity, and withstands mechanical loads from system pressures and external forces. Its dimensional accuracy and surface finish directly impact actuator efficiency, sealing performance, and service life.

Working Principle

The cylinder barrel operates by containing pressurized hydraulic fluid that transmits force to the piston. As fluid enters through ports, pressure builds within the barrel, creating linear motion of the piston along the barrel's internal bore. The barrel's cylindrical geometry and smooth surface minimize friction while maintaining structural integrity under cyclic pressure loads.

Materials

Typically manufactured from cold-drawn seamless steel tubing (ASTM A519), hardened and honed to precise tolerances. Common materials include: carbon steel (SAE 1018/1020), alloy steel (4140/4340), stainless steel (304/316), and aluminum alloys (6061-T6). Internal surfaces often receive chrome plating (0.0005-0.001" thickness) or nitriding for wear resistance and corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	25-500 mm (standard range)
Surface Finish	Ra 0.1-0.4 μm (honed)
Wall Thickness	Calculated per pressure rating (typically 2-20 mm)
Pressure Rating	70-350 bar (standard industrial)
Temperature Range	-20°C to +120°C
Straightness Tolerance	0.05 mm per meter

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

Standards

ISO 6020/2, ISO 6022, DIN 24554, DIN 24334, NFPA T3.6.7

Parent Products

This component is used in the following industrial products

Hydraulic or Electromechanical Actuator

A power conversion device that provides controlled linear or rotary motion to operate pinch rolls in industrial machinery.

View Product Details

Engineering Analysis

Risks & Mitigation

Internal corrosion from contaminated fluid
Wear from abrasive particles
Fatigue failure from cyclic pressure
Deformation from overpressure
Seal damage from poor surface finish

FMEA Triads

Trigger: Contaminated hydraulic fluid
Failure: Abrasive wear and scoring of internal surface
Mitigation: Implement proper filtration (10 μm or finer), regular fluid analysis, and use hard chrome plating

Trigger: Excessive side loading
Failure: Barrel bending and premature seal wear
Mitigation: Proper alignment during installation, use of external guides, and selecting barrels with adequate wall thickness

Trigger: Corrosive environment
Failure: Pitting and material degradation
Mitigation: Select corrosion-resistant materials (stainless steel), apply protective coatings, and maintain proper fluid chemistry

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Bore diameter: H8/H9, Straightness: 0.05 mm/m, Roundness: 0.01 mm

Test Method

Pressure testing per ISO 4413, dimensional inspection per ISO 2768, material certification per EN 10204-3.1

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Cylinder Barrel (Hydraulic)

Manufacturer profiles associated with Cylinder Barrel (Hydraulic).

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Related Components

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Frequently Asked Questions

What surface finish is required for hydraulic cylinder barrels?

Hydraulic cylinder barrels require honed internal surfaces with Ra values between 0.1-0.4 μm to ensure proper seal performance, minimize friction, and prevent fluid leakage. Chrome plating or nitriding is often applied for additional wear resistance.

How are cylinder barrels tested for quality?

Quality testing includes dimensional verification (bore diameter, straightness, roundness), surface finish measurement, pressure testing (1.5x working pressure), material certification, and non-destructive testing (ultrasonic, magnetic particle) for defects.

Can different materials be used for cylinder barrels?

Yes, material selection depends on application: carbon steel for general industrial use, alloy steel for high-pressure applications, stainless steel for corrosive environments, and aluminum for weight-sensitive applications. All require appropriate hardening and surface treatments.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Cylinder Barrel (Hydraulic)