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NdFeB Magnets

Classified as rare-earth permanent magnets built on Nd₂Fe₁₄B crystal structure, NdFeB delivers top-tier Br, Hcj and (BH)max among mainstream commercial magnets. Graded into N/M/H/SH/UH/EH/AH by intrinsic coercivity, high-grade types adopt Dy/Tb doping to improve anti-demagnetization performance via optimized raw material formula and sintering parameters. The product mainly falls into sintered and bonded subtypes: sintered NdFeB is manufactured via standard powder metallurgy routes for superior magnetism, while bonded grades mix magnet powder with resin for complex shaping at reduced magnetic properties. Available with Ni, Zn, epoxy or PTFE plating against inherent corrosion, temperature-classified NdFeB is extensively applied in new-energy motors, industrial servos, wind turbines and compact consumer electronics, with grades chosen per working temperature, demagnetization load and dimensional specs.
NdFeB Magnets Specifications
Item Parameters Reference Value
Mechanical and physical properties  Density(g/cm3) 7.45~7.70
Vickers Hardness(Hv)  650
Electrical Resistivity(μΩ•m) 1.4
Compressive Strength(MPa)  1050
Tensile Strength(MPa) 80
Bending Strength(MPa) 290
Thermal Conductivity(W/(m•K))  6~8
Young's Modulus(GPa)  160
Coefficient of Thermal Expansion(C ⊥) -1.5
Coefficient of Thermal Expansion(C //) 6.5
Additional magnetic properties Temp.Coeff.ofBr  (α(Br))/(%/K)  -0.08~-0.12
Temp.Coeff.of Hcj (β(Hcj))/(%/K) -0.42~-0.70
Curie Temperature (Tc)/(°C) 310~380
Recoil Permeability  (μrec)/(-) 1.05

NdFeB Magnetic Properties

Properties Remanence Coercive force Intrinsic coercive force Maximum energy product Working temp
Unit kGs T kOe kA/m MGOe kJ/m3
Nom. Min. Nom. Min. Nom. Min. Nom. Min. Nom. Min. Nom. Min.  
No Grade kOe kA/m
1 N30 11.2 10.8 1.12 1.08 10.5 10 836 796 ≥12 ≥955 30 28 239 223 ≤80
2 N35 12 11.7 1.2 1.17 11.3 10.8 900 860 ≥12 ≥955 35 33 279 263 ≤80
3 N38 12.6 12.2 1.26 1.22 11.5 11.3 915 900 ≥12 ≥955 38 36 303 287 ≤80
4 N40 12.9 12.6 1.29 1.26 11.6 11.4 924 908 ≥12 ≥955 40 38 318 303 ≤80
5 N42 13.1 12.9 1.31 1.29 11.8 11.5 939 915 ≥12 ≥955 42 40 342 326 ≤80
6 N45 13.6 13.3 1.36 1.33 12 11.6 955 924 ≥12 ≥955 45 43 358 342 ≤80
7 N48 14 13.8 1.4 1.38 10.8 10.2 860 810 ≥11 ≥875 48 46 383 367 ≤80
8 N50 14.3 14.1 1.43 1.41 10.8 10 860 794 ≥11 ≥875 50 48 398 383 ≤80
9 N52 14.5 14.2 1.45 1.42 10.8 10 860 794 ≥11 ≥875 52 50 414 398 60
10 N54 15.1 14.5 1.51 1.45 10.5 10 836 794 11 875 54 51 429 406 60
11 N55 15.4 14.7 1.54 1.47 10.5 10 836 794 ≥11 ≥875 55 52 438 414 ≤60
12 N30M 11.2 10.8 1.12 1.08 10.5 10 836 794 ≥14 ≥1114 30 28 239 223 ≤100
13 N35M 12 11.7 1.2 1.17 11.3 10.9 900 868 ≥14 ≥1114 35 33 279 263 ≤100
14 N38M 12.6 12.2 1.26 1.22 11.8 11.3 939 900 ≥14 ≥1114 38 36 303 287 ≤100
15 N40M 12.9 12.6 1.29 1.26 12 11.6 955 924 ≥14 ≥1114 40 38 318 303 ≤100
16 N42M 13.2 12.9 1.32 1.29 12.4 12 987 955 ≥14 ≥1114 42 40 342 326 ≤100
17 N45M 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥14 ≥1114 45 43 358 342 ≤100
18 N48M 14 13.8 1.4 1.38 13.3 12.9 1059 1027 ≥14 ≥1114 48 46 383 367 ≤100
19 N50M 14.3 14 1.43 1.4 13.5 13.1 1074 1042 ≥14 ≥1114 50 48 398 383 ≤100
20 N52M 14.5 14.2 1.45 1.42 13.6 13.2 1082 1050 ≥14 ≥1114 52 50 414 398 ≤80
21 N30H 11.2 10.8 1.12 1.08 10.5 10 836 794 ≥17 ≥1353 30 28 239 223 ≤120
22 N33H 11.7 11.4 1.17 1.14 11 10.5 876 836 ≥17 ≥1353 33 31 263 247 ≤120
23 N35H 12 11.7 1.2 1.17 11.3 10.9 900 868 ≥17 ≥1353 35 33 279 263 ≤120
24 N38H 12.6 12.2 1.26 1.22 11.8 11.3 939 900 ≥17 ≥1353 38 36 303 287 ≤120
25 N40H 12.8 12.6 1.28 1.26 12 11.6 955 924 ≥17 ≥1353 40 38 318 303 ≤120
26 N42H 13 12.8 1.3 1.28 12.4 12 987 955 ≥17 ≥1353 42 40 342 326 ≤120
27 N45H 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥17 ≥1353 45 43 358 342 ≤120
28 N48H 14 13.8 1.4 1.38 13.3 12.9 1059 1027 ≥17 ≥1353 48 46 383 367 ≤120
29 N50H 14.3 14 1.43 1.4 13.5 13.1 1074 1042 ≥17 ≥1353 50 48 398 383 120
30 N52H 14.5 14.2 1.45 1.42 13.6 13.2 1082 1050 ≥17 ≥1353 52 50 414 398 ≤100
31 N30SH 11.2 10.8 1.12 1.08 10.5 10.1 836 804 ≥20 ≥1595 30 28 239 223 ≤150
32 N33SH 11.7 11.4 1.17 1.14 11 10.6 876 844 ≥20 ≥1595 33 31 263 247 ≤150
33 N35SH 12 11.7 1.2 1.17 11.3 11 900 876 ≥20 ≥1595 35 33 279 263 ≤150
34 N37SH 12.3 12 1.23 1.2 11.5 11.3 915 900 ≥20 ≥1595 37 35 295 279 ≤150
35 N38SH 12.5 12.2 1.25 1.22 11.8 11.4 939 908 ≥20 ≥1595 38 36 303 287 ≤150
36 N40SH 12.7 12.5 1.27 1.25 12.1 11.8 963 939 ≥20 ≥1595 40 38 318 303 ≤150
37 N42SH 13 12.8 1.3 1.28 12.4 12 987 955 ≥20 ≥1595 42 40 342 326 ≤150
38 N45SH 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥20 ≥1595 45 43 358 342 ≤150
39 N48SH 14 13.8 1.4 1.38 13.3 12.9 1059 1027 ≥20 ≥1595 48 46 383 367 ≤130
40 N50SH 14.2 14 1.42 1.4 13.5 13.1 1074 1042 ≥20 ≥1595 50 48 398 383 ≤130
41 N25UH 10 9.6 1 0.96 9.6 9.2 764 732 ≥25 ≥1990 25 22 199 175 ≤180
42 N28UH 10.8 10.4 1.08 1.04 10.2 9.8 812 780 ≥25 ≥1990 28 26 223 207 ≤180
43 N30UH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 ≥25 ≥1990 30 28 239 223 ≤180
44 N33UH 11.5 11.3 1.15 1.13 11 10.6 876 844 ≥25 ≥1990 33 31 263 247 ≤180
45 N35UH 11.9 11.7 1.19 1.17 11.3 11 900 876 ≥25 ≥1990 35 33 279 263 ≤180
46 N38UH 12.5 12.2 1.25 1.22 11.8 11.4 939 908 ≥25 ≥1990 38 36 303 287 ≤180
47 N40UH 12.7 12.5 1.27 1.25 12.2 11.8 971 939 ≥25 ≥1990 40 38 318 303 ≤180
48 N42UH 13 12.8 1.3 1.28 12.4 12 987 955 ≥25 ≥1990 42 40 342 326 ≤180
49 N45UH 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥25 ≥1990 45 43 358 342 ≤150
50 N48UH 14 13.8 1.4 1.38 13.3 12.9 1059 1027 ≥25 ≥1990 48 45 383 367 ≤150
51 N50UH 14.2 13.9 1.42 1.39 13.5 13.1 1074 1042 ≥24 ≥1911 50 48 398 383 ≤150
52 N28EH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 ≥30 ≥2388 28 26 223 207 ≤200
53 N30EH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 ≥30 ≥2388 30 28 239 223 ≤200
54 N33EH 11.5 11.3 1.15 1.13 11 10.6 876 844 ≥30 ≥2388 33 31 263 247 ≤200
55 N35EH 11.9 11.7 1.19 1.17 11.3 11 900 876 ≥30 ≥2388 35 33 279 263 ≤200
56 N38EH 12.4 12.2 1.24 1.22 11.8 11.4 939 908 ≥30 ≥2388 38 36 303 287 ≤200
57 N40EH 12.7 12.4 1.27 1.24 12.2 11.8 971 939 ≥30 ≥2388 40 38 318 303 ≤200
58 N42EH 13 12.8 1.3 1.28 12.4 12 987 955 ≥30 ≥2388 42 40 334 318 ≤200
59 N45EH 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥30 ≥2388 45 43 358 342 ≤200
60 N48EH 14 13.8 1.38 1.38 13.3 12.9 1059 1027 ≥30 ≥2388 48 46 383 367 ≤200
61 N28AH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 ≥33 ≥2626 28 26 223 207 ≤220
62 N30AH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 ≥33 ≥2626 30 28 239 223 ≤220
63 N33AH 11.5 11.3 1.15 1.13 11 10.6 876 844 ≥33 ≥2626 33 31 263 247 ≤220
64 N35AH 11.9 11.7 1.19 1.17 11.5 11 915 876 ≥33 ≥2626 35 33 279 263 ≤220
65 N38AH 12.4 12.2 1.24 1.22 11.8 11.4 939 908 ≥33 ≥2626 37 35 294 279 ≤220
66 N40AH 12.7 12.4 1.27 1.24 12.1 11.8 971 939 ≥33 ≥2626 39 37 310 294 ≤220
67 N42AH 13 12.8 1.3 1.28 12.4 12 987 955 ≥33 ≥2626 42 40 334 318 ≤220
68 N45AH 13.5 13.3 1.35 1.33 12.6 12.2 1003 971 ≥33 ≥2626 45 43 358 342 ≤220
69 N28TH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 ≥40 ≥3185 28 26 223 207 ≤240
70 N30TH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 ≥40 ≥3185 30 28 239 223 ≤240
71 N33TH 11.5 11.3 1.15 1.13 11 10.6 876 844 ≥40 ≥3185 33 31 263 247 ≤240
72 N35TH 11.9 11.7 1.19 1.17 11.5 11 915 876 ≥40 ≥3185 35 33 279 263 ≤240
73 N38TH 12.4 12.2 1.24 1.22 11.8 11.4 939 908 ≥40 ≥3185 37 35 294 279 ≤240
74 N40TH 12.7 12.4 1.27 1.24 12.1 11.8 971 939 ≥40 ≥3185 39 37 310 294 ≤240
75 N28RH 10.8 10.4 1.08 1.04 10.4 9.8 811 780 ≥45 ≥3583 28 26 223 207 ≤260
76 N30RH 11.2 10.8 1.12 1.08 10.6 10.1 844 804 ≥45 ≥3583 30 28 239 223 ≤260
77 N33RH 11.5 11.3 1.15 1.13 11 10.6 876 844 ≥45 ≥3583 33 31 263 247 ≤260
78 N35RH 11.9 11.7 1.19 1.17 11.5 11 915 876 ≥45 ≥3583 35 33 279 263 ≤260

 

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Huge selection of different kinds of NdFeB magnets supply
We supply a huge selection of customized NdFeB magnets, including sintered NdFeB magnets, coated NdFeB magnets, block NdFeB magnets, disc NdFeB magnets and rare earth NdFeB magnets. Classified by diverse NdFeB magnetic grades, remanence parameters and practical application scenarios, our available NdFeB magnet products cover various specifications tailored for motors, electronics and multiple industrial uses.
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Quality You Can Trust With Inspection & Material Verification
Magnets need to meet many different inteational standards of compliance for materials. 
This is meant to protect the health and safety of both the end user and the environment. We take compliance very seriously 
for all of our customers, which is why we’ve invested in advanced scientific testing and verification equipment to qualify 
all incoming raw materials.
 
For your peace of mind, our facility is fully certified to ISO 9001, 14001 , CE certification and ROHS certification

Answers to Frequently Asked Questions

1.Can you customize permanent magnets according to specific requirements?
Sure. Custom made available.
2.What are the temperature and corrosion resistance properties of your magnets?
Max working temperature and corrosion resistance properties are based on different materials and grade, The maximum working temperature of alnico permanent magnet is more than 550 ° C, Samarium cobalt magnet is more than 500° C and ferrite magnet is about 250 ° C , Neodymium magnet is about 60-260° C and rubber magnet are about 100° C , but the actual value will still vary according to the size and shape of the material. AlNiCo magnets, Ferrite magnets and SmCo5 magnets have good corrosion resistance properties, SM2CO17 composition have some iron s, which can easily rust under harsh conditions. Therefore, it is necessary to electroplate the magnet. NDFEB magnets have poor corrosion resistance, and their finished products generally require electroplating treatment, such as NICUNI, ZN, EPOXY plating, etc.
3.How do you ensure the quality of your permanent magnets?
In order to ensure the quality of permanent magnets, the factory strictly follows the corresponding ISO or ts16949 quality management system for inquiries, quotations, order reviews, raw material procurement, and production process control.
4.What is the typical lead time for ordering permanent magnets?
Normally, our delivery date is 21-30 days
5.Do you provide technical support for integrating permanent magnets into our products?
Yes, we can provide technical support for integrating permanent magnets into your products. Permanent magnets are widely used in various applications, and proper integration is crucial for achieving optimal performance. Whether you need assistance with magnet selection, design considerations, magnetization direction, or any other aspect related to integrating permanent magnets, we are here to help. Please provide us with more specific details about your product and requirements, and I'll provide you with tailored guidance.
6.Can you supply permanent magnets in large quantities for bulk orders?
Yes, we can supply permanent magnets in large quantities for bulk orders. We have a wide range of permanent magnets available, including neodymium magnets, ferrite magnets, AlNiCo magnets and samarium cobalt magnets. Our manufacturing facilities are capable of producing high volumes to meet your requirements. Please provide us with specific details such as the type, size, quantity, and any other specifications you need, and we will be happy to provide you with a quote and further assistance.
7.What certifications do your permanent magnets comply with?
Our permanent magnets comply with various certifications depending on the specific type and application. Some common certifications for permanent magnets include ISO 9001, ISO 14001, 45001,RoHS (Restriction of Hazardous Substances), and REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals). These certifications ensure that our magnets meet international quality standards, environmental regulations, and restrictions on hazardous substances. If you have specific certification requirements or need more detailed information, please let us know, and we will provide you with the relevant details.
8.What is your minimum order quantity for magnets?
Our minimum order quantity for magnets may vary depending on the type, size, and specific requirements. Generally, for standard sizes and types of magnets, the minimum order quantity is typically around 100 to 1000 pieces. However, for customized or special magnets, the minimum order quantity may be higher. We understand that every customer's needs are unique, so please provide us with your specific requirements, and we will do our best to accommodate your needs and provide you with the most suitable solution.
What Grades of High Performance NdFeB Magnets Are Suitable for Motor Applications?
Many motor designers and procurement engineers struggle with mismatched magnet grades that lead to unstable motor output, excessive energy loss or shortened equipment service life when selecting NdFeB magnets for new production projects. Improper grade selection often results in unnecessary cost overruns from repeated sample testing and product rework. As a professional NdFeB magnet manufacturer with rich industrial application experience, we sort out mainstream high-performance sintered NdFeB magnet grades tailored to different working temperatures, torque requirements and operating environments of small precision motors, servo motors and large industrial drive motors, helping you pick the optimal NdFeB magnet specification efficiently while cutting procurement and R&D trial costs.
High-performance neodymium iron boron (NdFeB) magnets are the core magnetic components of modern high-efficiency motors, and their grade selection directly determines the motor’s power density, energy efficiency, service life, high-temperature stability, and operational safety. Selecting the right NdFeB magnet grade is critical to solving motor industry pain points such as demagnetization failure, excessive energy consumption, oversized volume, and short service life under high-temperature, high-speed, and high-load working conditions.

NdFeB Magnets

Core Performance Indicators for NdFeB Magnet Grades in Motor Applications

Motor-oriented NdFeB magnets focus on three key indicators, which are the core basis for grade division and selection:

  • Intrinsic Coercivity (Hcj): Represents the magnet’s resistance to demagnetization; higher values ensure stable magnetism in high-temperature, reverse magnetic field environments, avoiding motor performance degradation.
  • Maximum Energy Product (BHmax): Determines the magnetic field strength; high-energy-product grades enable motors to achieve higher power with smaller size and lighter weight, improving power density.
  • Temperature Stability (Curie Temperature/Tw): Defines the maximum safe operating temperature; matching the motor’s actual working temperature is the core to prevent thermal demagnetization failure.
NdFeB Magnets in China

Classification of High-Performance NdFeB Magnet Grades for Motors

High-performance NdFeB magnets for motors are divided into standard high-energy, high-coercivity, and ultra-high-temperature resistant grades according to application scenarios, covering all types of motor working conditions:

1. Standard High-Energy NdFeB Grades (Low-Temperature, High-Efficiency Motors)

Suitable for motors working at 60℃–100℃, with high energy product and cost-effective advantages, mainly used in small household appliances, low-power tools, and conventional drive motors:

  • N35–N52: Basic high-energy grades, N52 has the highest room-temperature energy product, ideal for small motors pursuing compact size; limited to low-temperature and low-load scenarios, poor high-temperature resistance.

2. High-Temperature Resistant NdFeB Grades (Medium-Temperature Industrial Motors)

Modified by adding cobalt, terbium, and other elements, with improved temperature resistance, suitable for motors working at 100℃–180℃, covering most industrial, automotive, and commercial motors:

  • M Grade (100℃): N35M–N50M, balanced energy and coercivity, for hydraulic motors, fan motors, and small industrial drive motors;
  • H Grade (120℃): N35H–N50H, universal high-temperature grade, widely used in air-conditioning compressors, electric tool motors, and automotive fuel pumps;
  • SH Grade (150℃): N35SH–N48SH, high coercivity, stable performance at medium high temperature, for new energy vehicle wipers, industrial frequency conversion motors, and pump motors;
  • UH Grade (180℃): N30UH–N45UH, ultra-high coercivity, resists high-temperature demagnetization, for high-temperature fans, packaging machinery motors, and automotive transmission motors.

3. Ultra-High-Temperature Resistant NdFeB Grades (Extreme High-Temperature High-Performance Motors)

Heavy rare earth optimized grades, suitable for motors working at 200℃–230℃ extreme environments, exclusive to high-end high-power motors:

  • EH Grade (200℃): N28EH–N40EH, for new energy vehicle main drive motors, high-power servo motors, and aerospace servo motors;
  • TH Grade (230℃): N25TH–N35TH, top high-temperature grade, for military motors, oil drilling motors, and high-temperature industrial furnace drive motors.
NdFeB Magnets  Indian

Grade Matching Guide for Different Motor Types (Core Application Solutions)

Targeted grade selection for mainstream motor types to directly solve user selection pain points:

  • New Energy Vehicle (NEV) Main Drive Motors: Priority EH/TH grade (N35EH, N30TH), high temperature resistance + high energy product, ensuring 10-year service life under high-speed and high-load conditions;
  • Industrial Servo Motors: SH/UH grade (N40SH, N35UH), high precision and high coercivity, adapting to frequent forward/reverse rotation and strong reverse magnetic fields;
  • HVAC Compressor Motors: H/SH grade (N45H, N40SH), energy-saving and high-temperature resistant, matching long-term continuous operation;
  • Electric Tool Motors: M/H grade (N48M, N45H), high magnetic strength and impact resistance, adapting to high-speed vibration working conditions;
  • Aerospace/High-Temperature Industrial Motors: TH grade, ultra-high temperature stability and reliability, meeting extreme environment requirements.

Key Selection Principles to Avoid Motor Failure

  • 1. Temperature first: Select the grade with temperature level 20℃–30℃ higher than the motor’s actual maximum working temperature;
  • 2. Load matching: High-load/high-reverse magnetic field motors must choose high-coercivity grades (SH/UH/EH) to avoid demagnetization;
  • 3. Volume constraint: Small-sized high-power motors use high-energy-product grades (N45–N52 series) to improve power density;
  • 4. Service life: Long-term continuous working motors give priority to high-coercivity grades, reducing aging and demagnetization risks.
NdFeB Magnets

Why High-Performance NdFeB Magnets Are Irreplaceable for Motors

Compared with Alnico, ferrite, and other magnets, high-performance NdFeB magnets have unparalleled advantages in motor applications:

  • Higher magnetic energy product, reducing motor volume and weight by 30%–50%;
  • Excellent coercivity, stable performance in high-temperature and complex magnetic fields;
  • Improve motor energy efficiency level by 5%–15%, reducing energy consumption and operating costs;
  • Customizable grades and sizes, fully adapting to various high-performance motor designs.

Conclusion

The selection of high-performance NdFeB magnet grades for motor applications needs to comprehensively match the motor’s working temperature, load characteristics, volume requirements, and service life. Standard grades (N/M/H) are suitable for conventional motors, medium high-temperature grades (SH/UH) for industrial/automotive motors, and ultra-high-temperature grades (EH/TH) for high-end extreme motors. Correct grade selection is the core to improve motor efficiency, extend service life, and reduce failure rates. For customized high-performance motor magnetic solutions, professional magnet manufacturers can provide targeted grade optimization and design support.

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