High-Performance Sintered NdFeB Magnets
Custom grades, precision machining, stable magnetic consistency and engineering support—from first sample to repeat production.
Standard Shapes. Drawing-Based Solutions.
Choose a common geometry or send a drawing for machining and magnetization review.
Why Engineering Teams Choose Guande
We connect material selection, manufacturability review and process control so a drawing can move from first sample to stable repeat production with fewer technical risks.
Precision Tolerances
Ground dimensions, parallelism and critical geometry are reviewed against shape, size, brittleness and the selected inspection method.
Application-Matched Coatings
Ni-Cu-Ni, zinc, epoxy, phosphating, passivation and special systems are selected around humidity, corrosion, bonding and assembly needs.
Fast Sampling & DFM Support
Drawing review, magnetization planning and prototype validation help confirm the design and production specification before volume release.
Tolerance, coating and sampling targets are confirmed against the final geometry, application environment and inspection agreement.
Technical Specifications & Material Grades
Compare reference magnetic properties, then review temperature, coating, tolerance and magnetization requirements with our engineering team before final grade selection.
| Grade | Br (kGs) | Br (Tesla) | Hcj (kOe) | Hcj (kA/m) | Hcb (kOe) | Hcb (kA/m) | (BH)max (MGOe) | (BH)max (kJ/m3) | Density ρ (g/cm3) | Curie Temp Tc (℃) | Max Temp Tw (℃) | Rec Permeability μrec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N35 | 11.7~12.2 | 1.17~1.22 | 12 | 955 | 10.9 | 867 | 33~36 | 263~287 | 7.45 | 310 | 80 | 1.05 |
| N38 | 12.2~12.5 | 1.22~1.25 | 12 | 955 | 11.3 | 899 | 36~39 | 287~310 | 7.5 | 320 | 80 | 1.05 |
| N40 | 12.5~12.8 | 1.25~1.28 | 12 | 955 | 11.6 | 923 | 38~41 | 302~326 | 7.5 | 320 | 80 | 1.05 |
| N42 | 12.8~13.2 | 1.28~1.32 | 12 | 955 | 11.6 | 923 | 40~43 | 318~342 | 7.5 | 320 | 80 | 1.05 |
| N45 | 13.2~13.6 | 1.32~1.36 | 12 | 955 | 11 | 875 | 43~46 | 342~366 | 7.5 | 320 | 80 | 1.05 |
| N48 | 13.6~14.0 | 1.36~1.40 | 12 | 955 | 11.2 | 891 | 46~49 | 366~390 | 7.5 | 320 | 80 | 1.05 |
| N50 | 14.0~14.3 | 1.40~1.43 | 12 | 955 | 10.5 | 836 | 47~51 | 374~406 | 7.55 | 320 | 80 | 1.05 |
| N52 | 14.3~14.6 | 1.43~1.46 | 12 | 955 | 10.5 | 836 | 51~53 | 390~422 | 7.55 | 320 | 80 | 1.05 |
| N35M | 11.7~12.2 | 1.17~1.22 | 14 | 1114 | 10.9 | 867 | 33~36 | 263~287 | 7.5 | 320 | 100 | 1.05 |
| N38M | 12.2~12.5 | 1.22~1.25 | 14 | 1114 | 11.3 | 899 | 36~39 | 287~310 | 7.5 | 320 | 100 | 1.05 |
| N40M | 12.5~12.8 | 1.25~1.28 | 14 | 1114 | 11.6 | 923 | 38~41 | 302~326 | 7.5 | 320 | 100 | 1.05 |
| N42M | 12.8~13.2 | 1.28~1.32 | 14 | 1114 | 12 | 955 | 40~43 | 318~342 | 7.5 | 320 | 100 | 1.05 |
| N45M | 13.2~13.6 | 1.32~1.36 | 14 | 1114 | 12.5 | 995 | 43~46 | 342~366 | 7.5 | 320 | 100 | 1.05 |
| N48M | 13.6~14.0 | 1.36~1.40 | 14 | 1114 | 12.8 | 1019 | 46~49 | 366~390 | 7.55 | 320 | 100 | 1.05 |
| N50M | 14.0~14.3 | 1.40~1.43 | 14 | 1114 | 13 | 1035 | 47~51 | 374~406 | 7.55 | 320 | 100 | 1.05 |
| N52M | 14.3~14.6 | 1.43~1.46 | 14 | 1114 | 12.5 | 995 | 51~53 | 390~422 | 7.55 | 320 | 100 | 1.05 |
| N35H | 11.7~12.2 | 1.17~1.22 | 17 | 1353 | 10.9 | 867 | 33~36 | 263~287 | 7.5 | 320 | 120 | 1.05 |
| N38H | 12.2~12.5 | 1.22~1.25 | 17 | 1353 | 11.3 | 899 | 36~39 | 287~310 | 7.5 | 320 | 120 | 1.05 |
| N40H | 12.5~12.8 | 1.25~1.28 | 17 | 1353 | 11.6 | 923 | 38~41 | 302~326 | 7.5 | 320 | 120 | 1.05 |
| N42H | 12.8~13.2 | 1.28~1.32 | 17 | 1353 | 12 | 955 | 40~43 | 318~342 | 7.55 | 320 | 120 | 1.05 |
| N45H | 13.2~13.6 | 1.32~1.36 | 17 | 1353 | 12.2 | 971 | 43~46 | 342~366 | 7.55 | 320 | 120 | 1.05 |
| N48H | 13.6~14.0 | 1.36~1.40 | 17 | 1353 | 12.9 | 1027 | 46~49 | 358~390 | 7.6 | 320 | 120 | 1.05 |
| N50H | 14.0~14.3 | 1.40~1.43 | 16 | 1273 | 13 | 1035 | 47~51 | 374~406 | 7.6 | 320 | 120 | 1.05 |
| N35SH | 11.7~12.2 | 1.17~1.22 | 20 | 1592 | 11 | 875 | 33~36 | 263~287 | 7.55 | 320 | 150 | 1.05 |
| N38SH | 12.2~12.5 | 1.22~1.25 | 20 | 1592 | 11.4 | 907 | 36~39 | 287~310 | 7.55 | 320 | 150 | 1.05 |
| N40SH | 12.5~12.8 | 1.25~1.28 | 20 | 1592 | 11.8 | 939 | 38~41 | 302~326 | 7.55 | 320 | 150 | 1.05 |
| N42SH | 12.8~13.2 | 1.28~1.32 | 20 | 1592 | 12.2 | 971 | 40~43 | 318~342 | 7.55 | 320 | 150 | 1.05 |
| N45SH | 13.2~13.6 | 1.32~1.36 | 20 | 1592 | 12.3 | 979 | 43~46 | 342~366 | 7.6 | 320 | 150 | 1.05 |
| N48SH | 13.6~14.0 | 1.36~1.40 | 19 | 1512 | 12.5 | 995 | 46~49 | 366~390 | 7.6 | 320 | 150 | 1.05 |
| N35UH | 11.7~12.2 | 1.17~1.22 | 25 | 1989 | 10.8 | 859 | 33~36 | 263~287 | 7.6 | 320 | 180 | 1.05 |
| N38UH | 12.2~12.5 | 1.22~1.25 | 25 | 1989 | 11 | 875 | 36~39 | 287~310 | 7.6 | 320 | 180 | 1.05 |
| N40UH | 12.5~12.8 | 1.25~1.28 | 25 | 1989 | 11.5 | 915 | 38~41 | 302~326 | 7.6 | 320 | 180 | 1.05 |
| N42UH | 12.8~13.2 | 1.28~1.32 | 25 | 1989 | 12.2 | 971 | 40~43 | 310~342 | 7.6 | 320 | 180 | 1.05 |
| N45UH | 13.2~13.6 | 1.32~1.36 | 24 | 1909 | 12.3 | 979 | 43~46 | 342~366 | 7.6 | 320 | 180 | 1.05 |
| N35EH | 11.7~12.2 | 1.17~1.22 | 30 | 2387 | 10.5 | 836 | 33~36 | 263~287 | 7.6 | 320 | 200 | 1.05 |
| N38EH | 12.2~12.5 | 1.22~1.25 | 30 | 2387 | 11.5 | 915 | 36~39 | 279~310 | 7.6 | 320 | 200 | 1.05 |
| N33EH | 11.3~11.7 | 1.13~1.17 | 34 | 2706 | 10.3 | 820 | 31~34 | 239~271 | 7.6 | 320 | 240 | 1.05 |
| N35AH | 11.7~12.2 | 1.17~1.22 | 34 | 2706 | 10.5 | 836 | 33~36 | 255~287 | 7.6 | 320 | 240 | 1.05 |
Selection note: Published magnetic values are reference data at 20°C. Final grade and operating temperature must be checked against magnet geometry, the working point, thermal cycle and acceptable irreversible loss.
Operating Temperature
N: 80°C · M: 100°C · H: 120°C · SH: 150°C · UH: 180°C · EH: 200°C · AH: up to 230–240°C under the stated test method. Actual limits depend on the magnetic circuit and duty cycle.
Coating Options
Ni-Cu-Ni for common indoor use; zinc for cost-effective protection; epoxy for moisture and corrosion resistance; phosphating or passivation for bonding and assembly.
Tolerance & Machining
Typical ground tolerance is ±0.05 mm. Tighter dimensions, thin walls, chamfers, slots and geometric tolerances are reviewed by shape, size and inspection method.
Magnetization Direction
Axial, diametrical, radial or segment-direction magnetization, including multipole patterns and custom fixtures where geometry and volume support a stable process.
Maximum Size
Size capability is geometry-dependent. Large blocks and arc segments may require a multi-piece design to control brittleness, machining risk and magnetic consistency.
Inspection Standard
Dimensions, appearance, coating, surface field or flux, magnetic moment and pull force where applicable. FAI, CoC, PPAP-style records, RoHS/REACH documents and demagnetization curves are available by agreement.
Magnet Selection That Starts With the Application
We translate operating conditions into a manufacturable grade, coating, geometry and inspection plan.
Manufacturing Capability & Quality Control
A connected production route protects magnetic performance, dimensional consistency and traceability from material preparation through final shipment.
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01
Material & Powder Control
Alloy chemistry, oxygen exposure and particle distribution are controlled for stable magnetic properties.
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02
Orientation & Pressing
Magnetic alignment and compact density are managed to achieve the intended easy-axis direction.
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03
Sintering & Heat Treatment
Temperature, time and atmosphere are tuned to develop density, coercivity and batch consistency.
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04
Precision Machining
Grinding, slicing and wire cutting deliver controlled profiles, parallelism and critical dimensions.
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05
Coating & Magnetization
Surface protection and magnetization fixtures are matched to the environment and magnetic circuit.
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06
Final Inspection & Traceability
Dimensional, visual and magnetic checks are linked to lot records and shipment documentation.
Dimensional Verification
CMM, optical inspection and calibrated gauges verify critical dimensions, geometry and tolerances.
Magnetic Performance
Material properties and finished-part flux, surface field or magnetic moment are checked to the agreed plan.
Reliability & Coating
Appearance, adhesion and application-specific corrosion or environmental tests protect service life.
Common Technical Questions
Practical answers for engineering and procurement teams.
How do I choose the right NdFeB grade?
Choose the grade from the required flux or force, operating temperature, magnet geometry and magnetic circuit—not from remanence alone. Share the drawing and working conditions, and we will compare practical grade options and cost.
How does temperature affect NdFeB magnets?
Temperature reduces coercivity and can cause irreversible flux loss if the working point is too low. Select N, M, H, SH, UH, EH or AH only after reviewing peak temperature, duration and the magnetic circuit.
What coating should I choose?
Ni-Cu-Ni suits many indoor applications. Zinc can be a cost-effective option, while epoxy is preferred when moisture or corrosion risk is higher. Bonding, salt spray and appearance requirements should be reviewed together.
What information is needed for a quotation?
Send the drawing, target force or flux, magnetization direction, operating temperature, environment, inspection requirements, annual volume and expected sample timing. We can then return a practical quotation and technical questions quickly.
Start with your operating conditions—not just a grade.
Send your drawing, target force or flux, working temperature, environment and annual volume. We will review feasibility and recommend a practical specification.