Custom NdFeB Magnets

Description

Product Overview

Neodymium Iron Boron magnets, often abbreviated as NdFeB magnets or simply neo magnets, represent a pinnacle of modern permanent magnet technology. Since their commercial invention in the 1980s by General Motors and Sumitomo Special Metals, they have redefined the landscape of electromagnetic applications due to their exceptional magnetic performance. As the most widely used rare earth magnet today, they hold the distinction of being the strongest type of permanent magnet commercially available, measured by energy product (BHmax), a critical metric quantifying a magnet's energy storage capacity.

At the heart of NdFeB magnets is a ternary alloy based on Neodymium (Nd), a rare earth metal, Iron (Fe), and Boron (B). The fundamental crystal structure is based on the Nd₂Fe₁₄B phase, which generates the strong magnetic field. To tailor performance for specific environments, various additives are often incorporated. For instance, Dysprosium (Dy) or Terbium (Tb) can be added to significantly enhance the magnet's Curie Temperature and resistance to demagnetization, making it suitable for high-temperature operations. Conversely, Cobalt (Co) may be included to improve corrosion resistance.

Ningbo Vanguard Technologies supplies custom magnets across the full grade family — from standard N-grade through M, H, SH, UH, and EH high-temperature series — enabling precise performance matching for each motor operating environment. All pieces undergo full magnetic testing, dimensional inspection, and salt-spray or HAST corrosion evaluation before shipment.

Whether you need a standard catalogue geometry or a fully custom magnet profile, Vanguard can provide sample shipment within 10–15 days and mass-production support for rotor assembly or bare-magnet supply.

Quick View

Custom NdFeB Magnet Selection Snapshot

N35-N55

Available Grade Range

Standard, M, H, SH, UH, EH and AH series can be selected by magnetic output and temperature margin.

80-220 °C

Temperature Class

From standard holding magnets to high-temperature EV, servo, spindle and generator applications.

Custom Shape

Geometry Control

Block, disc, ring, arc, wedge, countersunk, stepped and complex CNC-machined profiles are available.

10-15 Days

Prototype Sample Lead Time

Fast sampling after drawing, grade, coating, tolerance and magnetization direction are confirmed.

Temperature Grade Guide

N Series

80 °C

M Series

100 °C

H Series

120 °C

SH Series

150 °C

UH / EH / AH

180-220 °C

Application Demand Focus

EV Motors

Thermal margin

Servo Motors

Torque density

Wind Generators

Coercivity

Pumps

Coating

Medical Systems

Uniformity

1Drawing ReviewShape, tolerance, assembly space

2Grade MatchBr, Hcj, BHmax, temperature

3Coating PlanNiCuNi, epoxy, Zn, custom coating

4MagnetizationAxial, radial, diametrical, multi-pole

5InspectionFlux, size, polarity, appearance

Industries Served

Key Applications

EV Traction Motors

High-temperature custom NdFeB magnets for BEV/PHEV traction motors, hybrid powertrains and high-speed rotors requiring SH/UH grades, corrosion protection and stable performance under vibration.

Servo & Spindle Motors

Used in CNC machine tools, packaging lines, textile machinery, and assembly robots. The high magnetic strength allows motors to deliver instant torque at low speed and achieve extremely accurate positioning (down to microns).

Wind Generators

Traditional wind turbines use gearboxes, which are heavy, high-maintenance, and inefficient. Direct-drive systems eliminate the gearbox using large, high-performance NdFeB magnets. This increases reliability, lowers noise, improves efficiency at low wind speeds, and extends service life.

Pump & Compressor

Hermetic BLDC pump motors for HVAC and refrigeration compressors; epoxy-coated for condensate resistance.

Robot Joint Motors

Compact high-torque NdFeB magnets for humanoid robot and AGV joint actuators with tight dimensional tolerances.

MRI MACHINES

Permanent-magnet MRI systems use large assemblies of NdFeB magnets to generate strong, stable static magnetic fields. This allows detailed anatomical imaging without radiation. High-temperature stability and uniformity are strictly required.

Magnetic Performance

Grade & Magnetic Properties

Standard grades for custom NdFeB magnets. All values at 20 °C. Values are typical; exact grade selection is confirmed per application.

Grade	Remanence		Coercivity		Intrinsic Coercivity		Max. Energy Product		Temp. Coefficient (α)		Max. Working Temperature °C (L/D=0.7)
	Br		Hcb		Hcj		(BH)max		αBr (%/°C)	αHcj (%/°C)
	T	kGs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe	αBr (%/°C)	αHcj (%/°C)
N30	1.08–1.13	10.8–11.3	≥798	≥10.0	≥955	≥12	223–247	28–31	−0.12	−0.76	80
N33	1.13–1.17	11.3–11.7	≥836	≥10.5	≥955	≥12	247–271	31–34	−0.12	−0.76	80
N35	1.17–1.22	11.7–12.2	≥868	≥10.9	≥955	≥12	263–287	33–36	−0.12	−0.76	80
N38	1.22–1.25	12.2–12.5	≥899	≥11.3	≥955	≥12	287–310	36–39	−0.12	−0.76	80
N40	1.25–1.28	12.5–12.8	≥907	≥11.4	≥955	≥12	302–326	38–41	−0.12	−0.76	80
N42	1.28–1.32	12.8–13.2	≥915	≥11.5	≥955	≥12	318–342	40–43	−0.12	−0.76	80
N45	1.32–1.38	13.2–13.8	≥923	≥11.6	≥955	≥12	342–366	43–46	−0.12	−0.76	80
N48	1.38–1.42	13.8–14.2	≥923	≥11.6	≥955	≥12	366–390	46–49	−0.12	−0.76	80
N50	1.40–1.45	14.0–14.5	≥796	≥10.0	≥876	≥11	382–406	48–51	−0.12	−0.76	80
N52	1.43–1.48	14.3–14.8	≥796	≥10.0	≥876	≥11	398–422	50–53	−0.12	−0.76	80
N55	1.46–1.52	14.6–15.2	≥796	≥10.0	≥876	≥11	414–430	52–54	−0.12	−0.76	80
N35M	1.17–1.22	11.7–12.2	≥868	≥10.9	≥1114	≥14	263–287	33–36	−0.12	−0.68	100
N38M	1.22–1.25	12.2–12.5	≥899	≥11.3	≥1114	≥14	287–310	36–39	−0.12	−0.68	100
N40M	1.25–1.28	12.5–12.8	≥923	≥11.6	≥1114	≥14	302–326	38–41	−0.12	−0.68	100
N42M	1.28–1.32	12.8–13.2	≥955	≥12.0	≥1114	≥14	318–342	40–43	−0.12	−0.68	100
N45M	1.32–1.38	13.2–13.8	≥995	≥12.5	≥1114	≥14	342–366	43–46	−0.12	−0.68	100
N48M	1.37–1.43	13.7–14.3	≥1027	≥12.9	≥1114	≥14	366–390	46–49	−0.12	−0.68	100
N50M	1.40–1.45	14.0–14.5	≥1033	≥13.0	≥1114	≥14	382–406	48–51	−0.12	−0.68	100
N52M	1.43–1.48	14.3–14.8	≥1050	≥13.2	≥1114	≥14	398–422	50–53	−0.12	−0.68	100
N54M	1.45–1.50	14.5–15.0	≥1051	≥13.2	≥1114	≥14	414–438	52–55	−0.12	−0.68	100
N35H	1.17–1.22	11.7–12.2	≥868	≥10.9	≥1353	≥17	263–287	33–36	−0.12	−0.66	120
N38H	1.22–1.25	12.2–12.5	≥899	≥11.3	≥1353	≥17	287–310	36–39	−0.12	−0.66	120
N40H	1.25–1.28	12.5–12.8	≥923	≥11.6	≥1353	≥17	302–326	38–41	−0.12	−0.66	120
N42H	1.28–1.32	12.8–13.2	≥955	≥12.0	≥1353	≥17	318–342	40–43	−0.12	−0.66	120
N45H	1.32–1.36	13.2–13.6	≥963	≥12.1	≥1353	≥17	342–366	43–46	−0.12	−0.66	120
N48H	1.37–1.43	13.7–14.3	≥995	≥12.5	≥1353	≥17	366–390	46–49	−0.12	−0.66	120
N50H	1.40–1.45	14.0–14.5	≥1011	≥12.7	≥1353	≥17	382–406	48–51	−0.12	−0.66	120
N52H	1.43–1.48	14.3–14.8	≥1027	≥12.9	≥1353	≥17	398–422	50–53	−0.12	−0.66	120
N35SH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥1592	≥20	263–287	33–36	−0.11	−0.56	150
N38SH	1.22–1.25	12.2–12.5	≥907	≥11.4	≥1592	≥20	287–310	36–39	−0.11	−0.56	150
N40SH	1.25–1.28	12.5–12.8	≥939	≥11.8	≥1592	≥20	302–326	38–41	−0.11	−0.56	150
N42SH	1.28–1.32	12.8–13.2	≥987	≥12.4	≥1592	≥20	318–342	40–43	−0.11	−0.56	150
N45SH	1.32–1.38	13.2–13.8	≥1003	≥12.6	≥1592	≥20	342–366	43–46	−0.11	−0.56	150
N48SH	1.37–1.43	13.7–14.3	≥1027	≥12.9	≥1592	≥20	366–390	46–49	−0.11	−0.56	150
N50SH	1.40–1.45	14.0–14.5	≥1003	≥12.6	≥1592	≥20	382–406	48–51	−0.11	−0.56	150
N30UH	1.08–1.13	10.8–11.3	≥812	≥10.2	≥1990	≥25	223–247	28–31	−0.10	−0.50	180
N33UH	1.13–1.17	11.3–11.7	≥852	≥10.7	≥1990	≥25	247–271	31–34	−0.10	−0.50	180
N35UH	1.17–1.22	11.7–12.2	≥860	≥10.8	≥1990	≥25	263–287	33–36	−0.10	−0.50	180
N38UH	1.22–1.25	12.2–12.5	≥876	≥11.0	≥1990	≥25	287–310	36–39	−0.10	−0.50	180
N40UH	1.25–1.28	12.5–12.8	≥899	≥11.3	≥1990	≥25	302–326	38–41	−0.10	−0.50	180
N42UH	1.28–1.32	12.8–13.2	≥899	≥11.3	≥1990	≥25	318–342	40–43	−0.10	−0.50	180
N45UH	1.32–1.36	13.2–13.6	≥908	≥11.4	≥1990	≥25	342–366	43–46	−0.10	−0.50	180
N48UH	1.37–1.43	13.7–14.3	≥908	≥11.4	≥1990	≥25	366–390	46–49	−0.10	−0.50	180
N28EH	1.04–1.08	10.4–10.8	≥780	≥9.8	≥2388	≥30	207–231	26–29	−0.10	−0.45	200
N30EH	1.08–1.13	10.8–11.3	≥812	≥10.2	≥2388	≥30	223–247	28–31	−0.10	−0.45	200
N33EH	1.13–1.17	11.3–11.7	≥836	≥10.5	≥2388	≥30	247–271	31–34	−0.10	−0.45	200
N35EH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥2388	≥30	263–287	33–36	−0.10	−0.45	200
N38EH	1.22–1.25	12.2–12.5	≥899	≥11.3	≥2388	≥30	287–310	36–39	−0.10	−0.45	200
N40EH	1.25–1.28	12.5–12.8	≥899	≥11.3	≥2388	≥30	302–326	38–41	−0.10	−0.45	200
N42EH	1.28–1.32	12.8–13.2	≥899	≥11.3	≥2388	≥30	318–342	40–43	−0.10	−0.45	200
N45EH	1.32–1.36	13.2–13.6	≥899	≥11.3	≥2388	≥30	342–366	43–46	−0.10	−0.45	200
N28AH	1.04–1.08	10.4–10.8	≥787	≥9.9	≥2786	≥35	207–231	26–29	−0.10	−0.45	230
N30AH	1.08–1.13	10.8–11.3	≥819	≥10.3	≥2786	≥35	223–247	28–31	−0.10	−0.45	230
N33AH	1.13–1.17	11.3–11.7	≥843	≥10.6	≥2786	≥35	247–271	31–34	−0.10	−0.45	230
N35AH	1.17–1.22	11.7–12.2	≥876	≥11.0	≥2786	≥35	263–287	33–36	−0.10	−0.45	230
N38AH	1.22–1.25	12.2–12.5	≥899	≥11.3	≥2786	≥35	287–310	36–39	−0.10	−0.45	230

Typical Physical Properties (All Sintered NdFeB Grades)

Parameter	Unit	Reference Value	Parameter	Unit	Reference Value
Curie Temperature	°C	310 ~ 400	Thermal Conductivity	W/m·°C	8 ~ 10
Density	g/cm³	7.4 ~ 7.7	Young's Modulus	GPa	150 ~ 200
Vickers Hardness	HV	500 ~ 700	Electrical Resistivity (C∥)	μΩ·m	1.4 ~ 1.6
Recoil Permeability	—	1.02 ~ 1.08	Electrical Resistivity (C⊥)	μΩ·m	1.2 ~ 1.4
Compressive Strength	MPa	1000 ~ 1100	Coeff. of Thermal Expansion (C∥)	10⁻⁶/°C	4 ~ 9
Flexural Strength	MPa	150 ~ 400	Coeff. of Thermal Expansion (C⊥)	10⁻⁶/°C	−2 ~ 0

Magnetization Orientations Available

Surface Treatment

Coating & Plating Options

NdFeB is susceptible to oxidation without adequate surface protection. Vanguard specifies and verifies the following coating systems per IEC 60068 and ASTM B117 salt-spray standards.

Ni·Cu·Ni Triple Layer

Industry standard for clean, low-humidity environments. Bright silver finish.

Dimension Capability

Common Shapes & Typical Size Ranges

NdFeB (neodymium iron boron) magnets are highly customizable in size and shape, with standard ranges and tight tolerances to fit motors, sensors, electronics, and industrial assemblies.

Block / Rectangle

Length: 1–200 mm | Width: 0.5–100 mm | Thickness: 0.3–50 mm

Standard examples: 10×5×2 mm, 20×10×5 mm, 50×50×25 mm

Disc / Cylinder

Diameter: 1–250 mm | Thickness: 0.3–50 mm
Standard examples: D3×1 mm, D10×2 mm, D20×5 mm, D50×10 mm

Ring

Outer diameter: 5–200 mm | Inner diameter: 1–150 mm | Height: 1–50 mm
Standard examples: D10×D5×3 mm, D20×D10×5 mm

Arc / Segment

Used in motors; outer/inner radius, angle, and height fully custom
Typical: radius 5–100 mm, angle 30°–180°, thickness 2–20 mm

Micro & Miniature

Down to 0.3 mm thickness and 1 mm diameter for hearing aids, micro-motors, and precision electronics

Commercial grade: ±0.1 mm
Precision grade: ±0.05 mm
High-precision: ±0.02 mm (for high-speed motors & sensors)

Engineering Selection

How to Specify Custom NdFeB Magnets

Custom NdFeB magnet design should start from the working environment and magnetic circuit, not only the external shape. Vanguard reviews magnetic grade, operating temperature, demagnetization risk, geometry, coating, magnetization direction, assembly method and inspection requirements before confirming the final specification.

Performance target: Br, Hcj, (BH)max, surface flux, pull force or flux linkage can be controlled according to motor, sensor, holding or magnetic assembly requirements.

Thermal margin: N/M/H grades are suitable for standard applications, while SH/UH/EH/AH grades are recommended for high-temperature motors, compact rotors and harsh industrial environments.

Assembly reliability: Tolerance, chamfer, coating thickness, adhesive gap, polarity marking and packing direction should be confirmed together to reduce chipping, cracking and polarity mistakes.

Custom Capability

Available Shapes & Features

Category	Options	Typical Applications
Standard Shapes	Block, disc, cylinder, ring, arc, segment, tile	Motors, sensors, speakers, fixtures, magnetic couplings and holding systems.
Special Geometry	Wedge, countersunk, stepped, slotted, skewed, chamfered, micro-size	Compact rotors, axial-flux motors, embedded assemblies and precision instruments.
Magnetization	Axial, thickness, length, width, radial, diametrical, multi-pole, matched set	Encoders, Hall sensors, motors, couplings and custom magnetic field patterns.
Surface Protection	NiCuNi, Zn, epoxy, NiCuNi + epoxy, phosphating, passivation	Humidity resistance, salt-spray protection, bonding compatibility and high-reliability assemblies.

Manufacturing Process

From Drawing to Finished Magnet

Production starts with alloy preparation, hydrogen decrepitation, jet milling, magnetic-field alignment, pressing, vacuum sintering and aging. The sintered blanks are sliced, ground, drilled or profile-machined to the approved drawing, then coated, magnetized, inspected and packed for shipment.

For engineering projects, Vanguard can support DFM review, prototype sampling, fixture development, matched magnetic batches, polarity marking, lot traceability and production inspection plans.

Quality Assurance

Inspection & Validation

Magnetic testing: Br, Hcb, Hcj, (BH)max, surface flux, flux linkage, pull force, polarity and magnetization direction verification.

Dimensional control: Length, width, thickness, diameter, radius, angle, hole size, flatness, concentricity, chamfer and appearance inspection.

Coating verification: Thickness, adhesion, porosity, salt spray, humidity resistance and thermal shock testing according to coating type.

Documentation: Material certificate, inspection report, RoHS/REACH declaration, conflict-mineral declaration and lot traceability records are available for shipment release.

Request a Quote

Information Needed for Fast Quotation

To speed up engineering review, please send a 2D/3D drawing or list the key specifications below. If your project is still in the design stage, Vanguard can help compare grade, coating, magnetization and tolerance options before tooling.

Shape, dimensions, tolerance, chamfer, hole, slot or special geometry requirement
Material grade or target Br/Hcj, plus maximum working temperature
Magnetization direction, polarity marking, surface flux or pull force requirement
Coating type, salt-spray requirement, adhesive process and operating environment
Sample quantity, annual volume, packing requirement and target delivery schedule

Support

Frequently Asked Questions

How do I choose between M, H, SH, and UH grades for my motor?

Grade selection depends on the maximum winding temperature your motor will experience. M-grade (≤100 °C) suits most industrial servo applications; H-grade (≤120 °C) is standard for EV auxiliary motors; SH (≤150 °C) and UH (≤180 °C) are specified for EV traction drives and high-ambient industrial use. We recommend providing your thermal simulation data so we can confirm the correct grade.

What is the minimum order quantity for custom magnets?

For custom geometry, samples can be arranged from as few as 50–200 pieces. Mass-production MOQ is typically 1000–10000 pieces per specification, though this is flexible depending on magnet size and grade. Contact us to discuss your project volume.

Can you supply magnets already assembled into a rotor?

Yes. Vanguard provides integrated rotor assembly services — including magnet bonding, balancing, and shaft press-fitting — as part of our Magnetic Systems product line. We can supply bare magnets or complete rotor sub-assemblies depending on your manufacturing flow.

Do you provide material certifications and test reports?

Full material certificates (chemical composition, magnetic test data, coating thickness, salt-spray results) are provided with each shipment as standard. ROHS, REACH, and conflict-mineral declarations are available on request.

What is the lead time for NdFeB magnets?

Prototype samples: 10–15 working days. Mass-production orders: 25–35 working days depending on grade, coating, and quantity. Rush sampling may be available — please inquire.

Comments

Share your thoughts Showing 6 of 0 reviews

Get in Touch with Us

Name can't be empty

Email error!

Message can't be empty

Captcha Error!

Send Your Message

Custom NdFeB Magnets

Description

Custom NdFeB Magnets

Custom NdFeB Magnet Selection Snapshot

Key Applications

Grade & Magnetic Properties

Coating & Plating Options

Dimension Capability

How to Specify Custom NdFeB Magnets

Available Shapes & Features

From Drawing to Finished Magnet

Inspection & Validation

Information Needed for Fast Quotation

Frequently Asked Questions

Get in Touch with Us

Related Products

Arc NdFeB Magnets

Arc SmCo Magnets

Arc Ferrite Magnets

Ring NdFeB Magnets