INDUSTRY COMPONENT

Piston Rod

A precision-machined rod that transmits linear force in pneumatic actuators by connecting the piston to the external load.

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Component Specifications

Definition
The piston rod is a critical load-bearing component in pneumatic actuators that converts pneumatic pressure into mechanical linear motion. It serves as the interface between the internal piston assembly and the external mechanical system, transmitting force while maintaining alignment and sealing integrity through the actuator's gland or rod seal. Typically manufactured with high surface finish and dimensional accuracy to minimize friction and wear.
Working Principle
When compressed air enters the pneumatic actuator cylinder, it creates pressure differential across the piston. This pressure forces the piston to move linearly within the cylinder bore. The piston rod, rigidly attached to the piston, extends or retracts through the actuator's end cap, transmitting this linear motion to the connected load. The rod's straightness and surface quality ensure smooth operation while maintaining seal effectiveness.
Materials
Typically manufactured from case-hardened steel (AISI 1045, 4140, or 17-4PH stainless steel) with chrome plating (20-30μm thickness) for corrosion resistance and reduced friction. Alternative materials include stainless steel (304, 316) for corrosive environments or aluminum alloys for lightweight applications.
Technical Parameters
  • Diameter 6-100mm
  • Hardness HRC 45-60
  • Thread Types Metric, UNC, UNF
  • Maximum Stroke Up to 2000mm
  • Surface Finish Ra 0.2-0.4μm
  • Operating Pressure 1-16 bar
  • Straightness Tolerance 0.05mm per 300mm
Standards
ISO 6432, ISO 15552, DIN ISO 21287, DIN 24554

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Piston Rod.

pneumatic piston rod actuator rod chrome plated rod linear motion component ISO 15552 rod seal compatibility industrial cylinder rod Piston Rod Piston Rod in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Pneumatic Actuator

A mechanical device that converts compressed air energy into linear or rotary motion to perform work within an industrial system.

View Product Details

Hydraulic Ram

A hydraulic actuator that converts hydraulic pressure into linear mechanical force and motion.

View Product Details

Hydraulic Cylinder

A mechanical actuator that converts hydraulic pressure into linear force and motion.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Rod bending under compressive loads
  • Seal damage from surface imperfections
  • Corrosion in humid environments
  • Thread stripping at connection points
  • Fatigue failure at stress concentration points
FMEA Triads
Trigger: Improper alignment between actuator and load
Failure: Premature rod seal wear leading to air leakage
Mitigation: Use alignment couplings, ensure proper mounting perpendicularity, implement regular alignment checks
Trigger: Inadequate surface finish or chrome plating defects
Failure: Increased friction, seal damage, and reduced actuator efficiency
Mitigation: Specify Ra ≤0.4μm surface finish, implement incoming quality control for plating thickness and adhesion
Trigger: Exposure to corrosive chemicals or environments
Failure: Pitting corrosion leading to seal damage and potential rod fracture
Mitigation: Select appropriate material (stainless steel), implement protective boots, establish regular cleaning protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance: h8/h9 per ISO 286, Straightness: ≤0.1mm per meter, Surface roughness: Ra ≤0.4μm
Test Method
Dimensional verification using micrometers and CMM, surface roughness testing with profilometer, hardness testing with Rockwell scale, salt spray testing per ISO 9227 for corrosion resistance

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What causes piston rod bending in pneumatic actuators?

Rod bending typically results from excessive side loads, misalignment between actuator and load, or exceeding the actuator's maximum permissible buckling force. Proper mounting alignment and using guided actuators can prevent this issue.

How often should piston rods be inspected?

Visual inspection should occur monthly for high-cycle applications. Check for scoring, corrosion, or chrome plating damage. Complete dimensional inspection is recommended during annual maintenance or after 5 million cycles.

Can damaged chrome plating on piston rods be repaired?

Minor plating damage can be repaired using chrome plating repair kits for temporary solutions, but severely damaged rods should be replaced. Re-plating by specialized vendors is possible but often not cost-effective compared to replacement.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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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Piston Head Piston Rod (Connection)