Custom NdFeB for robotics, EV, and industrial OEMs
Your magnet supplier
shouldn't be your biggest risk.
Custom neodymium magnets and assemblies, engineered and quality-controlled by Mainrich through the production network we hold stakes in. Send your drawing for review of the material, assembly and inspection requirements.
1 business day
Human response
30 to 35 days
Sintered NdFeB production
1994
Founded
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.
Grade, series, geometry and operating temperature are confirmed together against the drawing.
Radial rings: ±0.05 mm within the documented size window; other constructions reviewed separately.
Sintered NdFeB; samples 10 to 15 days, urgent orders by arrangement. The quotation confirms each part's schedule, any licence step and transit.
For sintered NdFeB; the quotation sets it per part, by grade, size and weight. Other materials are quoted the same way.
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 coordinates the drawing, quality requirements and shipment documentation through the production network we hold equity stakes in. The quotation identifies the agreed production route, inspection scope and delivery terms.
Source
Material composition, supplier route and commercial terms are confirmed for the proposed order.
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 material routes
Use the technical reference to compare material properties. A series name does not establish grade availability or export clearance.
F-Series
Sintered NdFeB formulations described in the reference tables. Confirm the composition declaration, grade and geometry for the proposed part.
N-Series
Conventional material options for motor and industrial parts. Review the required magnetic properties and hot demagnetisation curves with the circuit.
D-Series
A reported N45H specimen comparison increased Hcj from 17.67 to 26.55 kOe. Br was 13.62 before and 13.61 kGs after treatment. Results apply to that comparison.
Application requirements
Mainrich magnets, by application.
Grade, magnet geometry and operating temperature are reviewed together against the drawing for each application.
Sample records
Measured results, with their scope.
Historical records support these examples. Agree the inspection plan for your part.
Pre-sales answers
The questions every buyer asks us first.
For sintered NdFeB, samples take 10 to 15 days, or 20 to 25 days with testing, and production takes 30 to 35 days. Urgent orders are handled by arrangement. Other materials, injection-molded magnets and assemblies are scheduled in the quotation, which confirms the schedule for every part, including any export licence step and transit.
No fixed minimum for sintered NdFeB; the quotation sets it per part, by grade, size and weight. Other materials and assemblies are quoted the same way.
Send your drawing, sample quantity and evaluation requirements. We confirm feasibility, tooling and delivery timing before an order.
Send the geometry, continuous and peak temperatures, and opposing field. A temperature suffix alone does not establish a safe operating point.
Include the customer requirements and submission level in the RFQ. We confirm the applicable production-plant certificate and documentation scope.
The documented radial-ring window has a standard dimensional tolerance of ±0.05 mm. Tighter features and other constructions require drawing review.
Material composition and the proposed transaction determine the export assessment. A grade suffix or series name alone does not establish clearance.
Production Network
The production network we hold stakes in.
Production across Guangdong, Zhejiang and Liaoning. Current certificates are confirmed for the named production entity and the scope of your order.
01Precision Machining
Dongguan
02Sintering Plant
Ningbo
03Production Line
Shenyang
04Melting Workshop
Network production
These July 2023 reports apply to the submitted samples. Documentation for the proposed magnet and coating is confirmed with the order.
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