Custom NdFeB / engineering desk

Custom NdFeB magnets.From drawing to delivery.

Sintered NdFeB across three series: F, HREE-free with no MOFCOM licence needed, N, conventional, and D, GBD with a factory-verified case using 75 % less Dy. Injection-molded magnets and custom assemblies include Halbach arrays and radial multipole rings. Work is engineered and quality-controlled by Mainrich across a four-site production network Mainrich holds equity stakes in.

Upload a drawing Review capabilities

N30 to N45AHGrade range

±0.03 mmWire-cut tolerance

±3°Deviation angle

~4 weeksNo-MOFCOM lead

Samples OKProgram entry

IATF 16949Certified plant route

GB/T 13012 · IEC 60404-5Standards

PPAP L3Quality evidence

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.

Automotive IATF 16949 work runs through the network's certified plant · 100 % post-magnetization inspection where specified · 30 years of upstream supply relationships · 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 type	Sintered · injection-molded · assemblies	Sintered NdFeB	Assemblies include Halbach arrays, radial rings, linear tracks.
Series	F (HREE-free) · N (conventional) · D (GBD)	D-Series	F-Series = no MOFCOM licence. D-Series = GBD (factory-verified case: 75% less Dy).
Grade	N30 to N45AH	N42SH	Grade, series, geometry and operating temperature are confirmed together against the drawing.
Br (remanence)	Grade-specific	1.28 T (N42)	Confirm the magnetic-property limits for the selected grade and geometry.
Max temp	80 – 230 °C	150 °C (SH)	N (80) · M (100) · H (120) · SH (150) · UH (180) · EH (200) · AH (230).
Shape	Block · disc · ring · arc · countersunk · Halbach · custom	Radial multipole ring	Per drawing / STEP. Arc up to 180°.
OD range	1.0 – 250 mm (arcs)	Per drawing	Radial multipole rings: OD 20 to 75 mm, ID 15 to 68 mm, wall 2 to 7 mm, height 5 to 50 mm; final dimensions per drawing.
Tolerance · ≤ 10 mm	±0.03 (wire cut) · ±0.05 (grind)	±0.05 mm	Per GB/T 13012.
Tolerance · 20–50 mm	±0.08 – 0.13 mm	±0.10 mm	Tighter on specific geometries on request.
Deviation angle	±3° (post-mag, 100% inspected)	±3°	Industry standard ±5°. 70–80 % pass rate to achieve ±3°.
Poles	2 · 4 · 8 · 10 · 12 (radial multipole)	10 / 12	Pole count, skew and waveform are set against the drawing and acceptance method.
Coatings	Ni · NiCuNi · Zn · Black Epoxy · NiCu+Epoxy · phosphate · passivation	NiCuNi 15–30 µm	Black Epoxy 96 h salt spray. Ni 72 h. NiCuNi 24 h.
HAST durability	< 1 mg/cm² @ 132 °C · 3 atm · 100 % RH · 60 d	L-35SH-T	L- prefix = low-weight-loss formulation. Grade-specific.
Lead time	~4 weeks (no MOFCOM) · 3–4 mo with MOFCOM	~4 weeks	F-Series fastest. MOFCOM-required programs need 3–4 months.
MOQ	Samples to production	Samples OK	No unit floor disqualifies a program.
QC	Cpk · Br · Hcj · flux · adhesion · coating · HAST	PPAP L3 (13 docs)	GB/T 2828.1-2003 sampling. Per-batch BH curve.
Export	MOFCOM in-house (N / D) · none required (F)	Handled	Ho-substituted grades licence-free during suspension (to Nov 2026).
Pricing	6–12 month fixed-price contracts	Locked	Enabled by three decades of upstream supply relationships.

Read the working spec as the common point.

The typical working spec is the common point inside the stated range, not the manufacturing limit. Drawing review determines the final combination of grade, geometry, tolerance, coating, and inspection.

MOFCOM grade map

Which NdFeB grade families trigger licensing.

Br, temperature class, coercivity route, HREE exposure, and current MOFCOM status in one view. Green N/M/H grades are the low-friction export path; SH and above need chemistry review before quoting.

Export control guide

Magnetic property distribution chart showing NdFeB grade families by maximum working temperature, intrinsic coercivity, HREE requirement, Ho exposure, and MOFCOM licensing status. — Use this as an RFQ planning map, then confirm the final export path with composition testing, destination, and current MOFCOM 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	38SH · 35UH · 38UH · 40EH
EPS motors	Electric power steering	45H · 38SH · 40SH · 42SH
Active suspension	Electromagnetic dampers	42SH
Pump motors	Thermal mgmt · coolant	33UH · 35UH
Starter motor	ICE start	38UH
Generator	On-board	38UH
ABS sensor	Anti-lock braking	44H · 42SH
CAM sensor	Camshaft position	42SH · 33EH
Gearbox	Position sensing	38UH · 35EH
Ignition coil	ICE	30UH · 33UH · 35UH · 33EH
Body · comfort	Window · seat · sunroof · liftgate	35M · 38H
In-cabin audio	Speakers	38H · 40H

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's your real lead time?~4 weeks · 3–4 mo/MOFCOM

F-Series (no MOFCOM): ~4 weeks. Pure manufacturing cycle. 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 treat licensing as a 4–6 week path.

When is GBD (D-Series) worth it vs conventional high-Dy?≥ 150 °C

Typically best for SH / UH / EH equivalents. Verified example: N45H upgraded to N45UH with 0.35 % Tb surface coating: Hcj +50 % (17.67 to 26.55 kOe), no Br loss, 75 % less Dy.

Do I need an export licence for my shipment?Depends on series

N / D series (HREE-containing): MOFCOM licence required, handled in-house, no third-party queue. F-Series: no licence (no Dy / Tb / Ho / Gd).

How tight can you actually hold?Cpk 2.95

Dimensional Cpk of 2.95 on OD across production runs (benchmark > 1.33 = capable). Br batch variation ±0.37 % on N45SH. Inter-batch flux variation < 5 %. Full PPAP L3 report available.

What coating for corrosive environments?Black Epoxy

Worst-case corrosion: Ni-Cu + Epoxy or Black Epoxy, 96 h salt spray. Default NiCuNi 24 h at 15–30 µm. Ni 72 h at 10–20 µm. Zn budget alternative.

Can you run small quantities?Yes

Samples and low-volume production run on the same tooling. No unit floor disqualifies a program.

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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