Piston Rod / Motor Shaft: Length Range 50-2000 mm

Component Specifications

Definition

The piston rod (in pneumatic/diaphragm systems) or motor shaft (in electric motors) is a critical load-bearing component that transmits mechanical force or torque. In pneumatic applications, it connects the piston to external machinery, converting compressed air energy into linear motion. In electric motors, it transfers rotational torque from the rotor to driven equipment. Both variants require high dimensional accuracy, surface finish, and structural integrity to withstand cyclic stresses.

Working Principle

Operates on force/torque transmission principles: In pneumatic systems, compressed air acts on the piston, pushing/pulling the rod linearly. In electric motors, electromagnetic induction creates rotational force on the rotor, transferred via the shaft. Both rely on precise alignment and minimal deflection to maintain efficiency.

Materials

Typically alloy steels (AISI 4140, 4340) for strength and wear resistance; stainless steels (304, 316) for corrosion resistance; sometimes aluminum alloys for lightweight applications. Surface treatments include chrome plating, nitriding, or induction hardening.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	45-55 HRC (hardened)
Length Range	50-2000 mm
Straightness	≤0.1 mm/m
Surface Roughness	Ra 0.4-1.6 μm
Diameter Tolerance	h6/h7 (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 286-2, DIN 748, ISO 2768-1

Parent Products

This component is used in the following industrial products

Piston/Diaphragm (Pneumatic) or Motor (Electric)

The core driving mechanism within an actuator that converts energy (pneumatic pressure or electrical power) into linear or rotary mechanical motion.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Bending or buckling under compressive loads
Wear and corrosion reducing lifespan
Misalignment causing seal damage

FMEA Triads

Trigger: Improper heat treatment or material defects
Failure: Fracture under load
Mitigation: Implement material certification and non-destructive testing (ultrasonic, magnetic particle)

Trigger: Inadequate lubrication or contamination
Failure: Excessive wear and seal leakage
Mitigation: Use sealed bearing systems and regular maintenance schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101; diameter tolerance IT6/IT7

Test Method

Dimensional inspection (CMM), hardness testing (Rockwell), surface roughness measurement, fatigue testing per ISO 12107

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.

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Manufacturers of Piston Rod / Motor Shaft

Manufacturer profiles associated with Piston Rod / Motor Shaft.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

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.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between a piston rod and a motor shaft?

A piston rod transmits linear motion in pneumatic/hydraulic systems, while a motor shaft transmits rotational torque in electric motors. Both are cylindrical rods but differ in loading conditions and connection methods.

How do I select the right material for a piston rod?

Consider operating environment: use alloy steel for high strength, stainless steel for corrosive environments, and aluminum for weight-sensitive applications. Surface hardening is often required for wear resistance.

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.

Piston Rod / Motor Shaft