Custom NdFeB for robotics, EV, and industrial OEMs
Your magnet supplier
shouldn't be your biggest risk.
Custom neodymium magnets and assemblies from drawing to delivery: sintered NdFeB, radial rings, arc segments, and bonded sub-assemblies — engineered and quality-controlled by Mainrich with IATF 16949 and in-house export licensing.
97%
On-Time Delivery
30-45
Day Lead Time (Real)
30+
Years, Same Ownership
Audited · approved · ordering
Supplier audits completed by buyers who care about repeatability, paperwork, and delivery risk.
Custom magnet RFQ
Custom neodymium magnets, quoted from drawings instead of catalog guesses.
Send a PDF, STEP, or tolerance stack. We answer with candidate grades, coating options, export path, and a lead time you can put into a purchasing plan.
Across F, N, and D-Series temperature classes.
Surface grind up to 20 mm; ±0.03 mm wire-cut.
F-Series fastest; MOFCOM-required programs need 3–4 months.
Prototype and low-volume runs are normal.
Core RFQ
Custom sintered NdFeB
Blocks, discs, rings, arcs, countersunk parts, and drawing-specific geometries across F, N, and D-Series production.
Motor geometry
Radial rings & rotor magnets
Multipole radial rings, arc segments, rotor assemblies, and low-noise servo geometries for robotics and EV programs.
Net-shape
Injection-molded magnets
NdFeB, ferrite, and SmFeN bonded in nylon or PPS for sensors, small motors, appliances, and high-volume molded parts.
Magnet assemblies
A cheaper magnet is not a cheaper rotor.
Per-kilo magnet pricing hides the engineering cost that lands on your line: incoming inspection of magnetized parts, adhesive qualification, balancing rework, and tolerance disputes between three suppliers. We deliver the qualified sub-assembly instead — rotor assemblies, radial multipole rings, encoder targets, and Halbach arrays, built to your print.
- —One incoming part number — magnet, bonding, balancing, magnetization, and QC under a single PO
- —Tolerance stack-up engineered once, not discovered at your incoming inspection
- —Export paperwork handled on the finished assembly, including MOFCOM where required
Sintered NdFeB blocks — the magnet is one line on the assembly BOM; the cost and risk live in everything around it.
Supply chain
One accountable partner — a production network we hold stakes in.
Mainrich engineers the part and owns the spec, the QC, and the export licensing. Production runs across four sites we've worked with — and hold equity stakes in — for three decades. Most "China magnet supplier" risk comes from allocation and price volatility; that network position neutralises both, and lets us lock 6–12 month fixed-price contracts our competitors can't.
Source
Three decades of upstream rare-earth supply relationships secure allocation at source — the position behind our 6–12 month fixed-price contracts.
Refine & sinter
NdFeB production at two facilities. Strip casting, hydrogen decrepitation, jet milling, pressing, sintering, grain boundary diffusion.
Machine & assemble
Precision machining in Dongguan. R&D + business centre in Zhongshan. Finished components, Halbach arrays, radial multipole rings.
Product taxonomy
Three sintered NdFeB series — pick by export risk, not just by grade.
Most suppliers ship one line. We run three, so programs can trade off magnetic performance, rare-earth content, and export paperwork to fit procurement's risk appetite.
HREE-Free
Sintered NdFeB with zero heavy rare-earth content. No MOFCOM export licence required. The right choice when procurement wants export risk off the table entirely.
Standard NdFeB
The full production range — N30 → N58 across all temperature classes up to 260 °C. The grade most automotive and industrial programs land on once specs are locked.
Grain-Boundary Diffusion
Same performance as high-temp N-grades with far less heavy rare earth. Verified N45H → N45UH via 0.35% Tb coating: Hcj +50%, no Br loss, 75% less Dy.
Where we ship · real grade matches
Mainrich magnets, by application.
Grade assignments pulled from our production records — not guessed. Each tile opens a spec-aware application page.
Proof, not claims
Four numbers we can defend in front of an auditor.
Pulled from the live QC dossier. Full report available under NDA.
Pre-sales answers
The questions every buyer asks us first.
F-Series (no MOFCOM): ~4 weeks. If the shipment requires MOFCOM export licensing, plan for roughly 3–4 months end-to-end. We handle the paperwork in-house, but we do not present licensing as a 4–6 week path.
Samples and low-volume production run on the same tooling. No unit floor disqualifies a program.
N42SH is the working default for 150 °C continuous. For sustained 180 °C envelopes, N42UH or N45UH with GBD processing gives equivalent flux at far lower Dy cost — factory-verified at 75 % less Dy with no Br loss.
Full PPAP Level 3 across all four facilities. IATF 16949 certified. PFMEA, control plans, MSA, capability studies, 8D response flows included.
Per GB/T 13012: ±0.03 mm wire-cut on dimensions ≤ 10 mm. ±0.05 mm surface grind 10–20 mm. ±0.10 mm at 20–50 mm. Tighter on request.
MOFCOM handled by our HK-based team. F-Series grades (HREE-free) require no export licence at all — often the fastest path for risk-averse procurement.
Production Network
Four network plants, all audited.
Production across Guangdong, Zhejiang, and Liaoning — plants we hold stakes in. IATF 16949 for automotive, ISO 14001 for environmental.
01Precision Machining
Dongguan
02Sintering Plant
Ningbo
03Production Line
Shenyang
04Melting Workshop
Zhongshan
RFQ
Send us your drawing.
PDF, STEP, DWG, or a rough spec. We respond within 1 business day with candidate grades, coating notes, export path, and next-step questions.
Request a quote
Talk to engineering
Book a 30-minute review
Review your drawing, export constraints, tolerance stack, and production path with our engineering team.
- Free consultation
- Technical feasibility review
- Preliminary quote discussion
Available Mon-Fri, 9AM-6PM GMT / HKT