Custom Neodymium Magnets: Built to Your Exact Specifications
Any shape, N35 to N55 and high-temperature grades up to 230 °C, any coating. Tolerances to ±0.05 mm. Made in ISO 9001 and IATF 16949 certified plants. No MOQ. Quotes within 24 hours on working days.
What We Can Custom Manufacture
From prototype to mass production: any shape, grade, coating and magnetization direction.
Shape & Form
- Disc & cylinder magnets
- Block & rectangular magnets
- Ring & annular magnets
- Arc segment magnets (for motors)
- Countersunk magnets
- Stepped discs
- Custom shapes via wire EDM
Grade Range
- N35 to N52, plus N55
- M series: up to 100 °C
- H series: up to 120 °C
- SH series: up to 150 °C
- UH series: up to 180 °C
- EH series: up to 200 °C; AH: up to 230 °C
- See every grade we make ↓
Coating Options
- Nickel (Ni-Cu-Ni): standard
- Epoxy: outdoor and chemical environments
- Zinc: industrial corrosion resistance
- Gold / Silver: conductive applications
- Parylene C/D: medical devices
- Uncoated / Phosphated
Custom Neodymium Magnet Grades: N35 to N55 and High-Temperature Series
Every grade below is available as a custom magnet in any shape and coating. Pick the series by the highest temperature your magnet will see, then the grade by the strength you need.
| Series | Grades we make | Max working temp. |
|---|---|---|
| N | N35, N38, N40, N42, N45, N48, N50, N52, N55 | 80 °C |
| M | N35M, N38M, N40M, N42M, N45M, N48M, N50M | 100 °C |
| H | N35H, N38H, N40H, N42H, N45H, N48H, N50H | 120 °C |
| SH | N33SH, N35SH, N38SH, N40SH, N42SH, N45SH, N48SH | 150 °C |
| UH | N30UH, N33UH, N35UH, N38UH, N40UH, N42UH, N45UH, N48UH | 180 °C |
| EH | N30EH, N33EH, N35EH, N38EH, N40EH | 200 °C |
| AH | N28AH, N30AH, N33AH, N35AH | 230 °C |
Br, Hcj and BHmax for each grade are in our NdFeB grade chart. For the M to AH series, see high-temperature neodymium magnets.
Need it free of heavy rare earths? We make grades up to N48SH without dysprosium or terbium. Above 230 °C, samarium cobalt magnets work up to 350 °C.
Material & Performance Data
All values are tested in the laboratory at our production plant. Test reports and B-H curves come with every order.
Tolerances are held by CNC grinding and wire EDM cutting, not manual processes. Every shipment includes dimensional inspection reports and demagnetization curves per IEC 60404-8-1.
| Parameter | Standard | Custom / Extended | Unit |
|---|---|---|---|
| Grade | N35 – N52 | N55; N35M to N50M … N28AH to N35AH | – |
| Remanence (Br) | 1.17 – 1.48 | Per grade spec | T |
| Coercive Force (Hcj) | ≥ 955 | Up to ≥ 2388 | kA/m |
| Max Energy Product | 263 – 422 | Per grade | kJ/m³ |
| Max Working Temp. | 80 °C (N) | Up to 230 °C (AH) | °C |
| Dimensional Tolerance | ± 0.05 mm | ± 0.02 mm available | mm |
| Surface Treatment | Ni, Zn, Epoxy | Gold, Parylene, custom | – |
| Magnetization | Axial / Diametric | Multi-pole, radial, custom | – |
* All values per IEC 60404-8-1. Custom grades and hybrid specs available on request.
Custom Manufacturing in 4 Steps
Engineering support and full documentation at every stage, from your drawing to your door.
Submit Requirements
Share drawings (DWG / STP / PDF), grade, temperature range, and quantity. Unsure about grade? Our engineers recommend one within 24 hours, at no charge.
Engineering Review
DFM analysis and FEA flux density simulation before cutting material. We flag any manufacturability issues before production begins.
Prototype & Approval
Prototype samples ship in 7–15 days and are usually free, with a dimensional inspection report and pull force test data. Approval typically takes 3–5 business days.
Mass Production
100% dimensional inspection and sampled magnetic performance testing. Shipment includes COC, test reports, and RoHS/REACH declaration.
Customized Magnet Solutions
Get precise, reliable performance with our customized magnet solutions. Mainrich Magnets tailors magnets to your exact specs: size, strength, shape and more. Trusted by industries worldwide for over 30 years.
Our Tailored Service List
Start From a Standard Shape
Most orders start from one of these shapes and change the size, grade, coating or magnetization.
Disc magnets
Discs and cylinders, from small sensor magnets to large holding discs.
Neodymium disc magnets →
Arc magnets
Arc segments for motor rotors and stators. By motor type: motor magnets.
Neodymium arc magnets →
Countersunk magnets
Countersunk discs, rings and blocks for screw mounting.
Neodymium countersunk magnets →
Injection molded NdFeB
Thin bars, complex shapes and multipole rings, molded to net shape.
Injection molded NdFeB magnets →Applications We Manufacture For
Purpose-built magnets for demanding applications across six industries.
EV & Motor Systems
N42SH and N45SH arc segment magnets for PMSM drive motors. GBD process reduces Dy content 40–70%, a direct cost reduction per motor unit.
Magnets for EV motors →Industrial Robotics
High-precision disc and ring magnets for servo motors, encoders, and magnetic grippers. ±0.02mm tolerance for tight air-gap control.
Magnets for robotics →Wind Turbine Generators
Large-format N50 and N52 grade magnets for direct-drive PMGs. Prototype to 100,000+ pcs per year with dedicated scheduling.
Discuss a wind project →Medical-Grade Magnets
Parylene C/D coating for biocompatibility. ISO 13485-compliant documentation available. Full lot traceability from raw material to shipment.
Medical grade magnets →Electronics & Sensors
Miniature disc and cylinder magnets for speakers, sensors, and haptic feedback. Br tolerance ±0.02T for production-line calibration.
Neodymium disc magnets →High-Reliability Applications
SmCo magnets available for extreme temperature environments (>230°C). Full material traceability and qualified supplier documentation.
Discuss your application →What Sets Our Manufacturing Apart
Four reasons engineers and procurement managers choose Mainrich for long-term supply.
Proven Manufacturing History
Founded in 1992, Mainrich has shipped to customers in 45+ countries and is a certified supplier to Tier 1 automotive manufacturers. Our experience means fewer surprises, faster problem resolution, and a supply chain you can rely on long-term.
One Production Chain, Three Plants
Melting, pressing, sintering, machining and coating run in our production plants in Guangdong, Zhejiang and Liaoning. Wire EDM and CNC grinding are done in the same plants, so tight tolerances stay inside one quality system.
IATF 16949 + ISO 9001 + ISO 14001
Our production plants are certified to IATF 16949, ISO 9001 and ISO 14001; certificates are available on request. We provide automotive quality documentation (PPAP, FMEA, Control Plans) on request. Automotive-grade supply chain compliance is already built in.
GBD Cost Reduction Technology
Grain Boundary Diffusion cuts dysprosium usage 40–70% versus conventional doping, with identical or better Hcj performance. One aerospace client reduced magnet material cost by $280,000 annually.
How GBD cuts NdFeB costs →Inside Our Magnet Factory
From raw rare-earth materials to finished magnets, every step runs in our production plants.
Raw Material Warehouse
Melting Workshop
Powder Making Workshop
Molding Workshop
Sintering Workshop
Testing Laboratory
Machining
Electroplating
Inspection & Packaging
Shipping Warehouse
Frequently Asked Questions
Common questions from engineers and procurement managers sourcing custom magnets.
Get Your Custom Quote in 24 Hours
Tell us your shape, grade, quantity, and timeline. Our engineers respond within one business day with a price, lead time, and technical recommendation.