Sintered NdFeB Magnets — Advanced Permanent Magnets for High-Efficiency Applications

Sintered neodymium iron boron (NdFeB) magnets are available in cylindrical, rectangular, and ring shapes, making them highly versatile for industrial applications.

Application Scope:

- Electric and Hybrid Motors (EV/HEV)
- Wind Turbine Generators
- Industrial Automation & Robotics
- Magnetic Separation & Filtration Systems
- Medical Devices and Analytical Instruments
- Consumer Electronics and Precision Sensors

Overview

Sintered NdFeB (Neodymium-Iron-Boron) magnets are the strongest commercially available permanent magnets today. With superior magnetic strength, high energy density, and excellent reliability, they are indispensable in industries such as electric mobility, wind power, robotics, and precision automation.

At Mag Spring, we supply high-performance sintered NdFeB magnets that deliver both power and sustainability.
Our Free HREE grades (N, M, H) contain no heavy rare earth elements (Dy, Tb), offering a reliable, cost-effective, and environmentally friendly alternative to conventional NdFeB magnets.

⚡ Breakthrough in Free HREE Technology: We have successfully developed and mass-produced Free HREE SH-grade magnets (from N35SH to N48SH). These magnets offer high thermal stability without the use of heavy rare earths (Dy, Tb), providing a more stable and cost-effective solution for high-temperature applications up to 150°C.

Sintered NdFeB Block Magnets for Magnetic Separators - MAG SPRING — NdFeB Block Magnets

High Performance NdFeB Disc Magnets for Industrial Sensors - MAG SPRING — NdFeB Disc Magnets

Grade N48SH NdFeB Cylinder Magnets with High Thermal Stability - MAG SPRING — NdFeB Cylinder Magnets

Precision NdFeB Segment Magnets for EV Motors and Generators - MAG SPRING — NdFeB Segment Magnets

Product Highlights

⚡ Exceptional Magnetic Strength
(BH)max up to 54 MGOe, enabling compact, lightweight designs for high-efficiency systems.
🌡️ Wide Operating Temperature Range
Grades: N, M, H, SH, UH, EH, AH,TH,RH covering 80°C–260°C.
♻️ Free HREE Innovation (Dy/Tb Free)
Our N, M, and H grades are fully Free HREE(Dy/Tb-Free Neodymium Magnets), offering stable performance without relying on restricted heavy rare earth elements.
→ Free HREE SH-grade magnets are under active development for high-temperature, eco-friendly applications.
🧩 Precision Customization
Available in block, ring, disc, arc, and other shapes, with tolerances as fine as ±0.02 mm for some small size.
🛡️ Protective Coatings
Ni-Cu-Ni, Zn, epoxy, Teflon coating ，Al or Parylene coatings to resist corrosion and surface oxidation.

Magnetic Grades and Typical Properties

Grade	Br (T)	HcJ (kA/m)	(BH)max (MGOe)	Max Temp (°C)	Remark
N35–N55	1.17–1.45	876–955	35–53.5	≤80	Standard Free HREE
N35M–M52M	1.14–1.42	955–1115	35–52	≤100	Mid-temp Free HREE
N35H–N52H	1.10–1.38	1115–1275	35–52	≤120	High-temp Free HREE
N35SH–N50SH	1.08–1.35	1275–1435	35–50	≤150	N35SH-N48SH Free HREE: Mass Production \| N50SH: R&D.
N33UH–UH48UH	1.05–1.30	1435–1595	35–48	≤180	High-coercivity
N30EH–N48EH	1.02–1.26	1595–1755	33–48	≤200	Heat-resistant
N30AH–N40AH	0.98–1.22	≥1755	30–40	≤230	Extreme Temp

Key Trade-Offs & Solutions

1. Shape Limitations

NdFeB magnets are best suited for block, ring, or arc-segment shapes.
While complex geometries can be achieved through post-machining, it’s important to note the material’s brittleness.
At Mag Spring, we employ CNC machining and wire-cutting processes to achieve precision tolerances down to ±0.05 mm （±0.02 mm for some items）, ensuring dimensional accuracy even for complex designs.

2. Brittleness & Corrosion

As a sintered alloy, NdFeB is mechanically brittle and susceptible to corrosion.
These issues are effectively mitigated through:

Protective coatings (NiCuNi, epoxy, Zn, Al，Teflon or Parylene) to enhance surface durability.
Automated handling and assembly systems that minimize chipping or cracking during production.

Our engineering team also provides application-specific coating and packaging advice to ensure long-term reliability under varying environmental conditions.

Why Sintered NdFeB Magnets Are Ideal for Magnetic Separators

Sintered NdFeB magnets are one of the most powerful permanent magnet materials available today. With their high magnetic energy density and high magnetic gradient, they are widely used in magnetic separators. Here are the advantages of using Sintered NdFeB magnets in magnetic separation systems:

High Magnetic Force & High Magnetic Gradient
With a (BH)ₘₐₓ of up to ~54 MGOe, Sintered NdFeB magnets generate powerful magnetic fields, even in small sizes. This enables them to effectively capture small, weakly magnetic contaminants, such as iron impurities in food, dairy powders, chemical powders, and mining materials, greatly improving product purity and production safety.
Applicable to Various Magnetic Separation Equipment
Due to their strong magnetic properties, Sintered NdFeB magnets are commonly used in Magnetic Bar, Plate-Type Magnetic Separator, Drum-Type Magnetic Separator, Rotary Grate, and Magnetic Fluid Filters, helping to remove fine iron particles, metallic oxides, and other contaminants from materials.
Space-Saving & Efficient Design
Compared to traditional ferrite or AlNiCo magnets, the high energy density of Sintered NdFeB magnets allows for more compact, lightweight magnetic separators, which is particularly beneficial for applications in space-constrained environments such as food processing and pharmaceuticals.
High Temperature Resistance & Durability
We offer Sintered NdFeB magnets in different temperature grades (such as N, UH, EH, etc.) to meet various operational conditions, especially in food/medical processing environments where high-temperature cleaning and sterilization are required.
Eco-Friendly & Safe Rare Earth Material Supply
Sintered NdFeB magnets are made using Free-HREE (no heavy rare earths) materials, ensuring high performance while minimizing environmental impact, aligning with the current green and sustainable trends in manufacturing.

Sintered NdFeB magnets are widely used in industries such as food, pharmaceuticals, chemicals, and mining, significantly enhancing the performance and efficiency of magnetic separators.

At MAG SPRING®, we offer magnetic separators that can be customized with Sintered NdFeB magnets for various applications, ensuring efficient and reliable removal of iron impurities in your production process.

Application Examples: How Sintered NdFeB Magnets Improve Magnetic Separation Efficiency

1. Food Industry

In the food industry, especially in the processing of dairy powders, sugar, coffee, and other powdered food products, Sintered NdFeB magnets are widely used in Plate-Type Magnetic Separators and Drum-Type Magnetic Separators. These devices help to remove iron contaminants, metallic fragments, and magnetic impurities from raw materials, significantly improving the purity and safety of the final product.

2. Chemical Industry

In the treatment of chemical raw materials and slurries, Magnetic Liquid Traps and Magnetic Coolant Filters equipped with Sintered NdFeB magnets effectively remove fine metallic contaminants from liquids, protecting production line equipment and ensuring the purity and quality of the final products.

3. Mining and Recycling

In the mining and metal recycling industries, Sintered NdFeB magnets are commonly used in Cross-Belt Magnetic Separators and Magnetic Sweepers to remove magnetic impurities or waste metal particles from minerals or scrap metal. The strong magnetic field enables efficient separation of fine iron particles, improving recovery rates and operational efficiency.

Why Choose Mag Spring

✅ Free HREE Technology Leader
Reduce Dy/Tb dependence, enhance sustainability, and stabilize supply.

✅ Strict Quality Control
ISO9001 & IATF16949 certified; 100% traceability from raw powder to finished product.

✅ Engineering Collaboration
Expert support in magnetic circuit design, FEM simulation, and custom coating solutions.

✅ Global Reach
Stable production capacity, rapid logistics, and dedicated support for worldwide clients.

✅Technical Milestone
Our Neodymium Magnets factory R&D team has overcome the coercivity challenges in heavy-rare-earth-free materials. Our N48SH Free HREE magnets now deliver industrial-grade performance with significant cost savings and sustainability benefits, ideal for the next generation of EV motors and high-gradient magnetic separators.

Sustainability & Future Development

Mag Spring is committed to developing magnets that balance performance, cost, and environmental responsibility.
Our Free HREE technology supports global decarbonization efforts by minimizing the use of restricted rare earth elements.

The upcoming SH-grade Free HREE magnets will further extend thermal stability for demanding applications such as electric traction motors and renewable energy systems, driving the future of sustainable magnet technology.

Request a Quote

Looking for Free HREE, high-performance NdFeB magnets for your next project?
Contact Mag Spring for custom designs, samples, or technical consultation.

📩 Email: act@magspring.com
🌐 Website: https://magnetact.com
💬 Let’s build a stronger, greener world — together.

1.Magnetic Properties of Sintered Neodymium Magnets:

Properties		Remanence(Br)				Coercive force(Hcb)				Intrinsic coercive force(Hcj)		Maximum energy product (BH)max				Working tempB/u oH=-2
Unit		kGs		T		kOe		kA/m				MGOe		kJ/m3		Working tempB/u oH=-2
Unit		Nom.	Min.	Nom.	Min.	Nom.	Min.	Nom.	Min.			Nom.	Min.	Nom.	Min.
No	Grade	Nom.	Min.	Nom.	Min.	Nom.	Min.	Nom.	Min.	kOe	kA/m	Nom.	Min.	Nom.	Min.	℃
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

Technical Reference: To learn more about the atomic structure and manufacturing standards of high-performance rare earth materials, refer to the Neodymium Magnet (NdFeB) Technical Overview on Wikipedia.

2.Largest Possible Size & Precision Limits for Sintered NdFeB Magnets

2.1 Available Shapes of Sintered NdFeB Magnets and Their Largest Standard Sizes

Shape	Picture	Dimenion	Recommended	Maximum
Shape	Picture	Dimenion	Dimension/mm	Dimension/mm
Block		L	≤180	≤ 220
		W	≤120	≤150
		T	≤60	≤80
Cylinder		D	≤150	≤220
Cylinder		T	≤60	≤80
Ring		D	≤120	≤160
		d	≤80	≤100
		T	≤45	≤65
Segment		L	≤180	≤220
		W	≤120	≤150
		T	≤60	≤80
		a	0-180°C

Note 1: A single magnet’s mass shall not exceed 5 kg when conforming to the recommended dimensions, nor 10 kg when approaching the maximum permissible dimensions.
Note 2: The attainable maximum dimension is grade-dependent and may therefore vary with the selected magnetic specification.

2.2 Standard Dimensional Tolerances Applicable to Sintered NdFeB Magnets Across Processing Routes

2.3 Geometric Tolerances Applicable to Sintered NdFeB Magnets Across Processing Routes

3.Surface Coating Specifications for Sintered NdFeB Magnets

Type	Coating Type	Color	Thickness(um)	SST(h)	PCT(h)	Salt immersion test	Working temp.(℃)	Characteristic
Metal coating	Blue Zn	Blue/White	4-8	≥48	≥48	N/A	＜160	Regular Protection, Applicable to most products
	Color Zn	Multiple colors	4-8	≥72	≥72	N/A	＜160	Excellent salt spray resistance
	NiCuNi	Silver white	10-20	≥72	≥96	N/A	＜200	Excellent humidity, heat &salt spray resistance
	electroless nickel	Silver white	10-30	≥96	≥72		＜200	Excellent humidity, heat &salt spray resistance
	Sn	Silver white	10-25	≥36	≥48		＜202	Excellent humidity, heat &salt spray resistance
	NiCuNI+Golden	Golden		≥12	≥48			Good Looking
	Al	Silver white	5-25	≥96	≥240	N/A	＜390	Excellent adhesive force, high temperature resistance
Organic coating	Epoxy (electro)	Black/Grey	10-30	≥480	≥96	N/A	＜160
Organic coating	Epoxy (spray)	Black/Grey	10-30	≥480	≥96	N/A	＜180
Multi-layer coating	NiCuNi+Epoxy	Black/Grey	15-45	≥720	≥168	N/A	＜180
Inorganic coating	Phosphate/ Passivated	Grey	＜2	N/A	N/A	1H	＜250	Temporary protection
Inorganic coating	Bluing	Blue	＜2	N/A	N/A	2H	＜250	Temporary protection

The foregoing data denote the optimal performance attainable; actual specifications shall be adapted commensurate with variations in product dimensions and geometry.
Multilayer coatings constitute an amalgamation of disparate coating systems. Consequently, their chromatic appearance, thickness, and service-temperature range may deviate according to the selected combination.
Test parameters:
• PCT: 121 °C, 100 % relative humidity, 2 atm absolute pressure.
• HAST: 132 °C, 95 % relative humidity, 2.7 atm absolute pressure. HAST serves to quantify the post-test mass loss of the magnet, wherein a lower value signifies superior corrosion resistance.

4.Mechanical and Physical Characteristics of Sintered NdFeB Magnets

Item	Parameters	Reference Value
Mechanical and physicalCharacteristics	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

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