01 — Overview
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.
02 — Production Capability
What we can hold
- OD range: 1mm to 150mm
- Thickness: 0.5mm to 50mm
- Axial magnetization standard; diametric available
- Full grade range N30 through N58
- Coating options tailored to environment (NiCuNi, epoxy, parylene for medical)
03 — Typical Use Cases
Where Disc magnets go to work
Hall sensor target magnets
Holding and clamping fixtures
Magnetic therapy devices
Educational and demonstration kits
Scientific instrument positioning
Medical device auxiliary mechanisms
04 — Dimensions & Tolerances
Typical Dimensions & Tolerances
| Parameter | Specification |
|---|---|
| Typical 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 |
Tighter spec?
These are typical production ranges. Send your drawing with the critical surfaces called out and we will confirm what we can hold against your tolerance stack-up.
05 — Recommended Grades
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.
06 — Related Applications
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 the top N grades, N52 through N58 (48–58 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.
Next step
Request a Quote for Disc Magnets
Share dimensions, quantity, grade, and target application. Our engineering team responds within 1 business day with a grade recommendation, followed by pricing and lead time within 2 business days.