Custom NdFeB / engineering desk

Custom NdFeB magnets.From drawing to delivery.

Sintered NdFeB magnets and custom assemblies, engineered and quality-controlled by Mainrich through the production network we hold equity stakes in. We review grade, geometry and operating conditions together before confirming a part.

Upload a drawing Review capabilities

N30 to N56Company summary

Per drawingGrade and geometry

Order scopeInspection and documents

1 business dayHuman response

Real NdFeB product range including rings, arc segments, discs, blocks, and finished magnetic parts — **Custom magnet reference / real products**Sintered rings, arc segments, discs, blocks, and finished magnetic parts.

Drawing review · Inspection scope agreed for the part · Human response within 1 business day

01 / CAPABILITY MATRIX

Everything a buyer asks before an RFQ.

A screenshot-friendly engineering ledger covering material series, grade, temperature, geometry, tolerance, coating, inspection, export path, and commercial terms.

Custom NdFeB control ledgerRange / working spec / notes

Control	Range	Typical working spec	Notes
Product	Sintered NdFeB and assemblies	Per drawing	Magnet and assembly requirements are reviewed together.
Grade	N30 to N56	Per drawing	Top grade by series: N56, N54M, N52H, N52SH, N50UH and N45EH; no AH grades. The company summary does not establish every grade and geometry combination.
Material route	F, N and D reference series	Material review	Confirm composition and magnetic-property requirements for the proposed material.
Radial-ring dimensions	OD 20 to 75 mm, ID 15 to 68 mm, wall 2 to 7 mm, height 5 to 50 mm; final dimensions per drawing	Per drawing	The documented window is qualification guidance; not every combination is feasible.
Radial-ring tolerance	±0.05 mm standard	Within documented window	Tighter features require drawing review. Integrated Halbach critical-feature limits are separate.
Temperature	Applicable hot curves	Circuit review	Geometry, opposing field and magnetic circuit determine the allowable operating conditions.
Coating	Stack and thickness specified	Environment review	Agree test method, duration and acceptance criteria. Salt-spray hours are not a service-life prediction.
Magnetisation	Direction, pole count and waveform	Per drawing	Material orientation and the magnetising fixture must suit the required pattern.
Inspection	Agreed control plan	Per feature	Sampling, lot records and documentation scope are agreed with the order.
Lead time	Production, licensing and transit	Per quotation	Timing depends on the proposed material, tooling, quantity and transaction.
Export assessment	Material and transaction review	Before shipment	A grade or series label alone does not establish export clearance.

Confirm the drawing and acceptance criteria.

Reference examples do not establish a standard production configuration. Drawing review determines the final combination of grade, geometry, tolerance, coating and inspection.

Export assessment

Confirm the material and transaction.

Composition, the finished item, destination, end user and end use need review. A grade-distribution chart cannot establish shipment clearance.

Export control guidance

02 / AUTOMOTIVE REFERENCE

Automotive grade references.

Grade examples for automotive design review. Confirm the grade and magnetic-property limits against the part drawing.

Automotive application ledgerDrawing review

Application	Component	Typical grades
EV drive motors	BEV / HEV traction	Confirm against circuit and drawing
EPS motors	Electric power steering	Confirm against circuit and drawing
Active suspension	Electromagnetic dampers	Confirm against circuit and drawing
Pump motors	Thermal mgmt · coolant	Confirm against circuit and drawing
Starter motor	ICE start	Confirm against circuit and drawing
Generator	On-board	Confirm against circuit and drawing
ABS sensor	Anti-lock braking	Confirm against circuit and drawing
CAM sensor	Camshaft position	Confirm against circuit and drawing
Gearbox	Position sensing	Confirm against circuit and drawing
Ignition coil	ICE	Confirm against circuit and drawing
Body · comfort	Window · seat · sunroof · liftgate	Confirm against circuit and drawing
In-cabin audio	Speakers	Confirm against circuit and drawing

03 / HUMANOID ROBOTICS

Radial multipole rings for joint motors.

Radial multipole rings can be reviewed for robot joint motors. Construction, pole pattern and dimensions are selected against the required field waveform and mechanical fit.

Design for the sustained thermal envelope.

Confirm magnet temperature, demagnetization margin and rotor geometry before selecting a grade. The documented radial-ring sample uses N45SH at Ø36.6 × Ø29.8 × 17 mm with 10 poles. Its surface scan describes that sample; production limits and the waveform acceptance method are agreed against your drawing.

Documented radial-ring sampleNovember 2025 surface scan

Grade	N45SH
Shape	Radial multipole ring
OD × ID × height	36.6 × 29.8 × 17 mm
Poles	10
Measurement	OD surface scan, KCS-906A
Waveform	Trapezoidal on this sample
Production limits	Confirmed against the drawing

04 / RFQ NOTES

Same FAQ, same answers, collected in one place.

Send the drawing, operating temperature, coating requirement, and destination. Mainrich separates manufacturing lead time from MOFCOM licensing so the quote shows the real schedule.

What is the delivery time?Per quotation

Production, any licensing steps and transit are confirmed separately for the material, tooling and quantity.

What does the GBD sample show?Sample result

A 0.35% Tb surface treatment increased Hcj from 17.67 to 26.55 kOe in the reported N45H comparison. Br changed from 13.62 to 13.61 kGs. A separate 50H composition example reports Dy changing from 1.2% to 0.3%; the records do not establish these as the same experiment.

Does my shipment need an export licence?Shipment review

Confirm the actual composition, finished item, destination, end user and end use against the applicable controls. The series or temperature suffix alone does not determine clearance.

What does the Cpk example establish?50 pieces

The 2 March 2026 report records OD Cpk 2.9492 for a 50-piece sample of 33EH rings, OD5 × 3.3 mm, with OD tolerance ±0.05 mm. It does not establish capability for other dimensions or repeated production runs.

How is the coating selected?Exposure and fit

Specify the environment, temperature, bond line and dimensional allowance. Agree coating stack, thickness, test conditions and acceptance criteria for the part.

Can I request samples?Drawing review

Send the sample quantity and evaluation requirements. Availability, tooling, price and timing are confirmed before an order.

Request for quote

Send us your drawing.

PDF or STEP. An engineer responds within 1 business day with candidate grades and FEM review where useful. Pricing follows within 2 business days with tolerances stated explicitly.

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