Magnetic couplings transmit torque between a driver and driven shaft without physical contact, using opposing permanent magnet arrays separated by a containment shell or air gap. This contactless torque transmission eliminates shaft seals, prevents leakage, and isolates the driven side from the driver — making magnetic couplings the preferred solution for pumping corrosive, toxic, or high-purity fluids where seal failure is not acceptable. They are widely used in chemical processing, pharmaceutical manufacturing, semiconductor fabrication, food processing, and cryogenic applications.

What to Look for in a Magnetic Coupling Supplier

• Torque capacity and slip torque — Magnetic couplings have a maximum transmittable torque beyond which they decouple. Confirm the coupling’s continuous torque rating and slip torque are appropriately sized for your application with adequate safety margin.
• Containment shell material — The containment shell separating the inner and outer magnet rotors must be non-magnetic and chemically compatible with the process fluid. Common materials include stainless steel, Hastelloy, PEEK, and other engineered polymers. Eddy current losses in metallic shells also affect efficiency.
• Temperature and pressure ratings — Confirm the coupling assembly — including bearings, seals, and containment shell — is rated for your process temperature and pressure conditions.
• Efficiency and eddy current losses — Metallic containment shells generate eddy current losses that reduce efficiency and generate heat. Evaluate efficiency ratings and thermal management requirements, particularly for high-speed or high-torque applications.
• Custom sizing — Standard catalog couplings may not fit all pump and motor configurations. Confirm whether the supplier offers custom designs and what lead times apply.