Pistons/Cylinders: Temperature Range -20°C to 100°C

Component Specifications

Definition

Pistons and cylinders are precision-engineered hydraulic components that form the core actuation mechanism in swing motors. The piston moves within the cylinder bore under hydraulic pressure, creating reciprocating motion that drives the motor's rotation. These components are designed to withstand high pressure cycles, maintain tight sealing, and operate efficiently with minimal friction and wear.

Working Principle

Hydraulic fluid under pressure enters the cylinder chamber, exerting force on the piston surface. This force causes the piston to move linearly within the cylinder bore. Multiple pistons arranged radially or axially work in sequence to create continuous rotational torque output through mechanical linkages to the motor shaft.

Materials

Pistons: Hardened alloy steel (AISI 4140, 4340) or ductile iron with chrome plating. Cylinders: High-strength steel (AISI 1045, 4130) with honed or ground interior surfaces. Seals: Nitrile rubber (NBR), polyurethane (PU), or fluorocarbon (FKM) for high-pressure applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	58-62 HRC (piston), 45-50 HRC (cylinder)
Clearance	10-25 μm
Surface Finish	Ra 0.2-0.4 μm
Pressure Rating	200-350 bar
Temperature Range	-20°C to 100°C

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 4394-1, ISO 1219, DIN 24342, DIN 24343

Parent Products

This component is used in the following industrial products

Swing Motor

A hydraulic or electric motor that provides rotational power to drive the swing mechanism of heavy machinery.

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Engineering Analysis

Risks & Mitigation

Hydraulic fluid contamination
Seal failure under high pressure
Cylinder wall scoring
Piston rod bending
Cavitation damage

FMEA Triads

Trigger: Contaminated hydraulic fluid
Failure: Abrasive wear on piston and cylinder surfaces
Mitigation: Implement proper filtration systems (10 μm or finer), regular fluid analysis, and scheduled maintenance

Trigger: Improper installation alignment
Failure: Uneven wear and premature seal failure
Mitigation: Use alignment tools during assembly, follow torque specifications, and verify concentricity

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Cylinder bore: H7, Piston diameter: f6-f7, Surface roughness: Ra ≤ 0.4 μm

Test Method

Pressure testing per ISO 4409, leakage testing per ISO 10767-1, endurance testing with minimum 1 million cycles

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 Pistons/Cylinders

Manufacturer profiles associated with Pistons/Cylinders.

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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 causes piston scoring in swing motors?

Piston scoring typically results from contamination in hydraulic fluid, inadequate lubrication, misalignment, or excessive side loads. Regular fluid filtration and proper installation prevent this issue.

How often should piston seals be replaced?

Seal replacement intervals depend on operating conditions, but typically range from 2,000 to 5,000 hours. Monitor for pressure drops, external leaks, or reduced performance as indicators.

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.

Pistons/Cylinders