Structured Manufacturing Data (2026)

Magnetic Coupling

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Magnetic Coupling used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Magnetic Coupling is characterized by the integration of Drive magnet assembly and Driven magnet assembly. In industrial production environments, manufacturers listed on CNFX commonly emphasize Neodymium magnets construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A non-contact torque transmission device that uses magnetic fields to transfer motion through a barrier.

Product Specifications

Technical details and manufacturing context for Magnetic Coupling

Definition
In level gauges, the magnetic coupling is a critical component that enables the transmission of float movement from the liquid side to the indicator side without physical penetration, maintaining a hermetic seal while allowing accurate level measurement.
Working Principle
Uses permanent magnets arranged on both sides of a non-magnetic barrier (typically the gauge wall). As the float moves with liquid level changes on one side, its attached magnet rotates or moves, creating a magnetic field that causes corresponding movement in the indicator magnet on the other side, translating liquid level into visible indication.
Common Materials
Neodymium magnets, Stainless steel housing, PTFE seals
Technical Parameters
  • Coupling diameter and thickness for torque transmission capacity (mm) Standard Spec
Components / BOM
  • Drive magnet assembly
    Attaches to float mechanism, creates magnetic field proportional to liquid level
    Material: Neodymium magnet with stainless steel casing
  • Driven magnet assembly Part
    Responds to magnetic field from drive side, rotates indicator mechanism
    Material: Neodymium magnet with corrosion-resistant coating
  • Bearing system
    Provides low-friction rotation for magnet assemblies
    Material: Stainless steel with PTFE bushings

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Magnetic Coupling.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100 bar (standard), higher with reinforced barriers
speed range: 0 to 10,000 RPM (limited by bearing system)
temperature: -40°C to 150°C (standard), up to 300°C with special materials
gap tolerance: 1-10 mm air gap depending on torque requirements
torque capacity: 0.1 Nm to 5000 Nm depending on size and magnet type
Media Compatibility
✓ Corrosive chemical transfer (acids, solvents) ✓ High-purity pharmaceutical/biotech fluids ✓ Hazardous/toxic material containment
Unsuitable: Ferromagnetic particle-laden slurries (causes magnetic interference and particle buildup)
Sizing Data Required
  • Required torque transmission (Nm)
  • Operating speed (RPM)
  • Barrier material/thickness requirements (for pressure/chemical compatibility)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Magnetic flux degradation
Cause: Overheating due to excessive slip, leading to demagnetization of permanent magnets; or exposure to corrosive environments causing material deterioration.
Coupling sleeve/barrier can failure
Cause: Fatigue cracking from cyclic torsional stresses or thermal expansion mismatch; or erosion/corrosion from fluid penetration in wet environments.
Maintenance Indicators
  • Audible high-frequency whining or grinding noise during operation, indicating excessive slip or physical contact between components
  • Visible overheating (discoloration) of the coupling housing or abnormal vibration during rotation
Engineering Tips
  • Implement strict alignment tolerances (angular <0.05°, parallel <0.1mm) and use laser alignment tools during installation to minimize parasitic forces
  • Install temperature monitoring sensors on the coupling housing and implement automatic shutdown protocols when temperatures exceed manufacturer's specified limits

Compliance & Manufacturing Standards

Reference Standards
ISO 1940-1:2003 (Balance quality requirements for rigid rotors) ANSI/AGMA 2000-A88 (Gear Classification and Inspection Handbook - relevant for coupling alignment) DIN 740-2:1986 (Flexible shaft couplings - magnetic couplings)
Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Parallelism of mounting faces: 0.05mm
Quality Inspection
  • Magnetic flux density measurement (Gauss meter test)
  • Leakage current test (for electrically isolated couplings)

Factories Producing Magnetic Coupling

Manufacturer profiles with relevant production capability in China

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 are the main advantages of using a magnetic coupling in machinery?

Magnetic couplings provide leak-proof torque transmission through barriers, eliminate mechanical wear from contact, require no lubrication, and offer overload protection through slip capability.

How does the PTFE seal enhance magnetic coupling performance?

PTFE seals provide chemical resistance, maintain integrity across temperature variations, and create reliable barriers for applications involving fluids or controlled environments.

What maintenance is required for neodymium magnet couplings?

Minimal maintenance is needed due to non-contact operation. Periodic inspection of bearings and seals is recommended, with magnet strength typically lasting decades under normal operating conditions.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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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