Custom Neodymium Magnets — Built to Your Exact Specifications
Any shape, any grade (N35–N52 + high-temp), any coating. Tolerances to ±0.05mm. ISO 9001 & IATF 16949 certified. MOQ 100 pcs. Quote in 24 hours.
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
- Custom shapes via wire EDM
Grade Range
- N35 → N52 (standard series)
- N__M — up to 100°C
- N__H — up to 120°C
- N__SH — up to 150°C
- N__UH — up to 180°C
- N__EH / AH — up to 230°C
Coating Options
- Nickel (Ni-Cu-Ni) — standard
- Epoxy — outdoor / chemical env.
- Zinc — industrial corrosion resist.
- Gold / Silver — conductive apps
- Parylene C/D — medical devices
- Uncoated / Phosphated
Material & Performance Data
All values verified by our in-house testing lab. Full certificates, test reports, and B-H curves included with every order.
Tolerances are guaranteed 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 | N35M to N52AH | — |
| Remanence (Br) | 1.17 – 1.48 | Per grade spec | T |
| Coercive Force (Hcj) | ≥ 955 | Up to ≥ 2388 (EH) | 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 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
50-pc prototype batch with 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
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% — 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.
Magnets for wind turbines →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 40+ countries and serves as 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.
Vertically Integrated Production
We control every step from sintering to final magnetization — no subcontracting. In-house wire EDM and CNC grinding achieves tolerances other suppliers send out for. Result: faster lead times, tighter quality control, and cost savings passed to you.
IATF 16949 + ISO 9001 + ISO 14001
Triple certification means your procurement team won't need a new supplier audit. We provide all 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 →Factory Showcase
From raw rare-earth materials to finished magnets — every step is controlled in-house across our dedicated production facility.
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.