Basic Information of the NdFeB Irregular Magnet

Material	Sintered NdFeB
Shape	Irregular
Size	Customized
Grade	Customized
Coating	Customized
Magnetization Direction	Customized
Package	Vacuum Bag + Carton + Pallet or customized

All Grades Matrix Graph

Free of Export Control Substances

product-978-699

Customized Solution for Sintered NdFeB Irregular Magnets

1. Geometric Shape Customization: Beyond Standard Limits

Based on the 2D/3D drawings or samples provided by customers, we can manufacture magnets in any complex shape, including but not limited to:

Multi‑feature combinations (steps, counterbores, threaded holes, side holes, etc.)
Non‑circular contours (trapezoidal, sector, racetrack, elliptical, D‑shape, etc.)
3D free‑form surfaces (curved, inclined, tapered, spherical, etc.)
Thin‑walled irregular parts (minimum wall thickness down to 0.8 mm), long narrow slots, precision edges with chamfers/radii

Processing techniques include: multi‑wire cutting, ID cutting, grinding (surface / ID/OD / form grinding), wire EDM, sinker EDM, CNC machining, ultrasonic drilling, etc.
Dimensional tolerances can be controlled within ±0.02 mm to ±0.05 mm, and for special requirements down to ±0.01 mm.

2. Magnetic Performance Customization: Grade Selection on Demand

We offer a complete sintered NdFeB grade system and can match the optimal solution based on operating temperature, maximum energy product, coercivity, and other parameters:

Standard N series: N35 – N52 (maximum operating temperature ≤80°C)
High‑temperature series: H (120°C), SH (150°C), UH (180°C), EH (200°C), AH (220°C+)
Low coercivity / high remanence: for applications requiring high remanence with low demagnetization risk
Customer‑specified grades: we can accept any grade designated by the customer

For special applications, we can also adjust the squareness (Hk/Hcj), maximum energy product ((BH)max), and temperature coefficient to ensure stable performance under extreme environments.

3. Surface Coating Customization: Adaptable to Any Environment

Sintered NdFeB is easily oxidized and must be protected with a coating. We recommend the optimal coating based on your actual application environment (humidity, salt spray, temperature, contact media, biocompatibility, etc.), or we can strictly apply the coating type you specify:

Nickel (Ni‑Cu‑Ni): Most common, salt spray ≥48 hours, bright appearance, suitable for most indoor environments
Zinc (Zn): Blue‑white or colored zinc, cost‑effective, red rust resistance ≥72 hours
Epoxy: Thickness 15‑30μm, good insulation, salt spray resistance up to 200 hours
Phosphate: Temporary anti‑rust primer, suitable for pretreatment before overmolding
Special coatings: Gold, silver, etc.

We can provide coating adhesion tests, salt spray test reports.

4. Magnetization Direction Customization: Realizing Complex Magnetic Circuits

The magnetization direction of an NdFeB irregular magnet is not limited to simple axial or radial orientation. We support multiple magnetization schemes:

Single‑direction magnetization: magnetized along a specific axis (e.g., length, width, thickness direction)
Multi‑pole alternating magnetization: forming N/S/N/S alternating poles on the same plane (number of poles can be specified from 2 to 32)
Radial / spoke magnetization: suitable for irregular rings or cylinders with a center hole – the magnetic field radiates outward from the center
Bevel / conical magnetization: for special angle sensors or magnetic encoders.

Characteristics Of Sintered NdFeB Magnet
Properties		Br				Hcb		Hcj		(BH)max
NO.	Grade	kGs		T		kOe	kA/m	kOe	kA/m	MGOe		kJ/m³
NO.	Grade	Max.	Min.	Max.	Min.	kOe	kA/m	kOe	kA/m	Max.	Min.	Max.	Min.
1	N35	12.5	11.8	1.25	1.18	≥10.8	≥860	≥12	≥955	38	33	302	263
2	N38	13.0	12.3	1.30	1.23	≥10.8	≥860	≥12	≥955	41	36	326	286
3	N40	13.2	12.6	1.32	1.26	≥10.8	≥860	≥12	≥955	42	38	334	302
4	N42	13.5	13.0	1.35	1.30	≥10.8	≥860	≥12	≥955	44	40	350	318
5	N45	13.8	13.2	1.38	1.32	≥10.8	≥860	≥12	≥955	46	42	366	334
6	N48	14.3	13.7	1.43	1.37	≥10.5	≥836	≥11	≥875	49	45	390	358
7	N50	14.6	13.9	1.46	1.39	≥10.5	≥836	≥11	≥875	51	47	406	374
8	N52	14.8	14.2	1.48	1.42	≥10.5	≥836	≥11	≥875	53	49	422	390
9	N54	15.0	14.4	1.50	1.44	≥10.5	≥836	≥11	≥875	55	50	438	398
10	N56	15.2	14.6	1.52	1.46	≥9.0	≥716	≥10	≥796	56	51	446	406
11	N35M	12.5	11.8	1.25	1.18	≥11.0	≥875	≥14	≥1114	38	33	302	263
12	N38M	13.0	12.3	1.30	1.23	≥11.5	≥916	≥14	≥1114	41	36	326	287
13	N40M	13.2	12.6	1.32	1.26	≥11.8	≥939	≥14	≥1114	43	38	342	302
14	N42M	13.5	13.0	1.35	1.30	≥12.0	≥955	≥14	≥1114	45	40	358	318
15	N45M	13.8	13.2	1.38	1.32	≥12.2	≥971	≥14	≥1114	47	42	374	334
16	N48M	14.3	13.7	1.43	1.37	≥12.5	≥995	≥14	≥1114	50	45	398	358
17	N50M	14.6	13.9	1.46	1.39	≥12.5	≥995	≥13	≥1035	52	47	414	374
18	N52M	14.8	14.2	1.48	1.42	≥12.5	≥995	≥13	≥1035	53	49	422	390
19	N54M	15.0	14.4	1.50	1.44	≥12.5	≥995	≥13	≥1035	55	50	438	398
20	N56M	15.2	14.6	1.52	1.46	≥12.5	≥995	≥13	≥1035	56	51	446	406
21	N35H	12.5	11.8	1.25	1.18	≥11.0	≥875	≥17	≥1353	38	33	302	263
22	N38H	13.0	12.3	1.30	1.23	≥11.5	≥916	≥17	≥1353	41	36	326	287
23	N40H	13.2	12.6	1.32	1.26	≥11.8	≥939	≥17	≥1353	43	38	342	302
24	N44H	13.7	13.0	1.37	1.30	≥12.1	≥963	≥16	≥1273	46	41	366	326
25	N46H	14.0	13.4	1.40	1.34	≥12.5	≥995	≥16	≥1273	48	43	382	342
26	N48H	14.2	13.6	1.42	1.36	≥12.7	≥1011	≥16	≥1273	50	45	398	358
27	N50H	14.4	13.8	1.44	1.38	≥12.9	≥1026	≥16	≥1273	51	46	406	366
28	N52H	14.6	14.0	1.46	1.40	≥13.0	≥1035	≥16	≥1273	53	47	422	374
29	N54H	14.8	14.2	1.48	1.42	≥13.2	≥1051	≥16	≥1273	54	49	430	390
30	N35SH	12.5	11.8	1.25	1.18	≥11.1	≥883	≥20	≥1592	38	33	302	263
31	N38SH	13.0	12.3	1.30	1.23	≥11.6	≥923	≥20	≥1592	41	36	326	287
32	N40SH	13.2	12.6	1.32	1.26	≥11.8	≥939	≥20	≥1592	43	38	342	302
33	N42SH	13.4	12.8	1.34	1.28	≥12.0	≥955	≥19	≥1512	44	39	350	310
34	N45SH	13.8	13.2	1.38	1.32	≥12.4	≥987	≥19	≥1512	47	42	374	334
35	N48SH	14.2	13.6	1.42	1.36	≥12.7	≥1011	≥19	≥1512	50	45	398	358
36	N50SH	14.4	13.8	1.44	1.38	≥13.0	≥1035	≥19	≥1512	51	46	406	366
37	N52SH	14.6	14.0	1.46	1.40	≥13.3	≥1059	≥19	≥1512	53	47	422	374
38	N33UH	12.2	11.4	1.22	1.14	≥10.8	≥859	≥25	≥1990	36	31	287	247
39	N35UH	12.5	11.8	1.25	1.18	≥11.2	≥891	≥25	≥1990	38	33	302	263
40	N38UH	12.8	12.2	1.28	1.22	≥11.6	≥923	≥25	≥1990	40	36	318	287
41	N40UH	13.2	12.6	1.32	1.26	≥12.0	≥955	≥25	≥1990	42	38	334	302
42	N42UH	13.5	13.0	1.35	1.30	≥12.0	≥955	≥25	≥1990	44	40	350	318
43	N45UH	13.8	13.2	1.38	1.32	≥12.4	≥987	≥25	≥1990	47	42	374	334
44	N48UH	14.1	13.6	1.41	1.36	≥12.7	≥1011	≥24	≥1911	50	44	398	350
45	N30EH	11.7	10.9	1.17	1.09	≥10.3	≥820	≥30	≥2388	33	28	263	223
46	N33EH	12.0	11.4	1.20	1.14	≥10.8	≥859	≥30	≥2388	35	31	279	247
47	N35EH	12.3	11.7	1.23	1.17	≥11.1	≥883	≥30	≥2388	37	33	295	263
48	N38EH	12.8	12.2	1.28	1.22	≥11.6	≥923	≥30	≥2388	40	36	318	287
49	N40EH	13.1	12.5	1.31	1.25	≥11.8	≥939	≥30	≥2388	42	37	334	295
50	N44EH	13.5	13.0	1.35	1.10	≥12.3	≥979	≥29	≥2308	46	11	366	326
51	N46EH	13.8	13.3	1.38	1.33	≥12.6	≥1003	≥29	≥2308	47	42	374	334
52	N28EHS	11.3	10.5	1.13	1.05	≥10.0	≥780	≥35	≥2786	31	26	247	207
53	N30EHS	11.7	10.9	1.17	1.09	≥10.3	≥820	≥35	≥2786	33	28	263	223
54	N33EHS	12.0	11.4	1.20	1.14	≥10.8	≥859	≥35	≥2786	36	31	287	247
55	N35EHS	12.3	11.7	1.23	1.17	≥11.1	≥883	≥35	≥2786	37	33	295	263
56	N38EHS	12.8	12.2	1.28	1.22	≥11.6	≥923	≥34	≥2706	40	36	318	286
57	N40EHS	13.1	12.5	1.31	1.25	≥11.8	≥939	≥34	≥2706	42	37	334	295
58	N42EHS	13.3	12.8	1.33	1.28	≥12.0	≥955	≥34	≥2706	44	39	350	310