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
ParameterTypical rangeNotes & selection driver
Diameter6-100mm
HardnessHRC 45-60
Thread TypesMetric, UNC, UNF
Maximum StrokeUp to 2000mm
Surface FinishRa 0.2-0.4μm
Operating Pressure1-16 bar
Straightness Tolerance0.05mm per 300mm

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 6432, ISO 15552, DIN ISO 21287, DIN 24554

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.

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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

Typical Suppliers & Equivalents

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

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 Piston Rod

Manufacturer profiles associated with Piston Rod.

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Related Components

Mounting Interface
Precision mounting interface connecting punch tips to pharmaceutical tablet press machines for accurate tablet production.
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.

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.

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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