INDUSTRY COMPONENT

Rod

A precision-machined rod that transmits linear force in hydraulic and pneumatic actuators.

Component Specifications

Definition
The rod is a critical load-bearing component in hydraulic cylinders and pneumatic actuators, designed to convert fluid pressure into linear mechanical motion. It connects the piston to the external load, transmitting force while maintaining alignment and sealing integrity through the cylinder head. Precision-ground surfaces ensure smooth operation and prevent leakage.
Working Principle
The rod moves linearly within the cylinder bore as hydraulic fluid or compressed air acts on the piston. It transfers force from the internal pressure differential to external machinery, with seals preventing fluid leakage and wipers excluding contaminants.
Materials
Typically high-strength alloy steel (e.g., AISI 4140, 1045 carbon steel) with chrome plating (hard chrome, thickness 20-40μm) for corrosion resistance, wear resistance, and reduced friction. Alternative materials include stainless steel (316, 17-4PH) for corrosive environments.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Hardness45-55 HRC (core), 65-70 HRC (chrome plating)
Length Range50-6000 mm
Straightness0.05 mm per 1000 mm
Surface RoughnessRa 0.2-0.4 μm
Diameter Toleranceh8/h9 (ISO)

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 6432, DIN 24554, DIN ISO 3320

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Fatigue failure from cyclic loading
  • Corrosion in humid/chemical environments
  • Seal wear due to surface imperfections
  • Bending from off-axis loads
FMEA Triads
Trigger: Improper alignment or side loading
Failure: Rod bending or scoring, leading to seal damage and fluid leakage
Mitigation: Use alignment couplings, ensure proper cylinder mounting, and specify adequate rod hardness
Trigger: Insufficient chrome plating thickness or quality
Failure: Corrosion pitting and accelerated seal wear
Mitigation: Specify hard chrome plating per ISO 6158, conduct regular thickness checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Diameter: h8/h9 per ISO 286, Straightness: ≤0.1 mm/m per ISO 1101
Test Method
Dimensional inspection (CMM), hardness testing (Rockwell), coating thickness (XRF), salt spray testing per ISO 9227

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Rod

Manufacturer profiles associated with Rod.

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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

Why is chrome plating used on piston rods?

Chrome plating provides excellent corrosion resistance, reduces friction with seals, and enhances wear durability in harsh industrial environments.

What causes rod bending or scoring?

Misalignment, side loading, inadequate hardness, or contamination ingress can lead to bending, scoring, or seal damage, resulting in leakage and reduced efficiency.

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.

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