About Disc Magnets
Disc magnets — flat cylinders with diameter larger than thickness — are specified where a compact, high-flux magnet is required without a through-hole. Applications span compact sensor systems, holding magnets, magnetic therapy devices, maglev demonstration assemblies, and educational kits. Disc magnets are also common in medical device auxiliary mechanisms and scientific instrumentation.
Production Capability
- •OD range: 1mm to 150mm
- •Thickness: 0.5mm to 50mm
- •Axial magnetization standard; diametric available
- •Full grade range N35 through N52
- •Coating options tailored to environment (NiCuNi, epoxy, parylene for medical)
Typical Use Cases
- •Hall sensor target magnets
- •Holding and clamping fixtures
- •Magnetic therapy devices
- •Educational and demonstration kits
- •Scientific instrument positioning
- •Medical device auxiliary mechanisms
Typical Dimensions & Tolerances
Dimensions
OD 1–150mm, thickness 0.5–50mm (with aspect ratios from 1:1 to 50:1)
Tolerances
±0.05mm standard; ±0.02mm precision available
Recommended Grades for Disc
N35
80°CEntry-level sintered NdFeB grade for cost-sensitive permanent-magnet applications at or below 80°C.
N38
80°CCost-efficient mid-range sintered NdFeB for general permanent-magnet assemblies up to 80°C.
N42
80°CHigh-performance sintered NdFeB grade widely used in compact motors, generators, and precision actuators.
N45
80°CHigher-flux sintered NdFeB grade suited to compact, high-torque designs where temperature is controlled.
N48
80°CPremium sintered NdFeB grade for compact, high-energy-density motor and actuator designs.
Related Applications
Medical Devices
Precision NdFeB magnets for MRI equipment, surgical robotics, implantable devices, dental applications, and medical sensors — with the biocompatibility and traceability medical programs require.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Frequently Asked Questions
What is the strongest disc magnet you can make?
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Energy density peaks with N52 grade (48–53 MGOe). For a 20mm OD × 5mm thick N52 disc, typical surface flux at the pole face is 0.5–0.6 T. Stronger magnets in absolute terms are achieved by increasing volume (larger OD or thickness) or using Halbach-array assemblies of multiple discs — a single disc's peak flux is bounded by the material's BHmax.
What coating should I use for disc magnets in medical applications?
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Parylene-C coating is the standard choice for disc magnets in medical applications — biocompatible (ISO 10993, USP Class VI), pinhole-free when properly applied, and survives sterilization cycles. For non-contact medical applications where biocompatibility is not required, epoxy-over-NiCuNi offers better mechanical durability.
Request a Quote for Disc Magnets
Share dimensions, quantity, grade, and target application. Our engineering team responds within 1 business day with grade recommendation, followed by pricing and lead time within 2 business days.