Neodymium Magnet

Neodymium Magnet (also known as NdFeB Magnet, Neo Magnet, Strong Magnet, Permanent Magnet, Rare Earth Magnet) is one of the most widely used type of rare-earth magnet.
Neodymium magnet is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. Developed independently in 1984 by General Motors and Sumitomo Special Metals,neodymium magnets are the strongest type of permanent magnet available commercially.
Because of different manufacturing processes, they are divided into two subcategories: sintered NdFeB magnets and bonded NdFeB magnets.
Neodymium magnets are powerful yet discreet magnets, providing a far greater magnetic hold than other magnets at a fraction of the size.
They are particularly suitable for high volume production in the variety of shapes and sizes. Precise dimensional control can be obtained in the machining processes. With these advantages, Neodymium magnets have been widely applied in lots of commercial fields, such as high-performance motors, brushless DC motors, magnetic separators, magnetic resonance imaging (MRI), sensors, loudspeakers, consumer electronics and green energy.
Our range of rare earth neodymium magnets is made up of an array of shapes and sizes to facilitate multiple uses, including but not limited to holding and hanging functions and closure applications.
Neodymium magnets are all graded by the material they are made of. As a very general rule, the higher the grade (the number following the ‘N’), the stronger the magnet. The highest grade of neodymium magnet currently available is N52. Our standard stock neodymium magnets are graded at N35, this is the most cost effective rating for use in retail displays, exhibitions and closures.Any letter following the grade refers to the temperature rating of the magnet. If there are no letters following the grade, then the magnet is standard temperature neodymium. The temperature ratings are standard (no designation) – M – H – SH – UH – EH.
All our neodymium magnets are finished with a triple coating of nickel-copper-nickel to prevent corrosion and provide optimum performance up to 60°C.
Rare Earth Magnets have a high resistance to demagnetization, unlike most other types of magnets. They will not lose their magnetization around other magnets or if dropped. They will however, begin to lose strength if they are heated above their maximum operating temperature, which is 176°F (80°C) for standard N grades. They will completely lose their magnetization if heated above their Curie temperature, which is 590°F (310°C) for standard N grades.
We can supply higher rated magnets for special applications, including magnets for use in high temperature environments, which can withstand higher temperatures without losing strength.
We can make neodymium magnets into various shapes like disc magnet, block magnet, cube magnet, ring magnet, rod magnet, tile magnet, sphere magnet, and etc.
We can make shiny neodymium magnets to our customers by different coating including Zinc, Nickle-Copper-Nickle, Silver, Gold, Epoxy, etc.
We can also custom manufacture neodymium magnets to fit your exact specifications, just contact us today, and we’ll work with you to determine the most economical solution for your project.

Properties of Sintered Neodymium Magnets

Grade	Remanence		Coercive Force		Intrisic Coercive Force		Max Energy Product		Working Temp(L/D=0.7)
Grade	KGS	T	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	℃
N30	10.8-11.3	1.08-1.13	≥10	≥796	≥12	≥955	28-31	223-247	≤80
N33	11.3-11.8	1.13-1.17	≥10.5	≥836	≥12	≥955	31-34	247-271	≤80
N35	11.7-12.2	1.17-1.22	≥10.9	≥868	≥12	≥955	33-36	263-287	≤80
N38	12.2-12.5	1.22-1.25	≥11.3	≥899	≥12	≥955	36-39	287-310	≤80
N40	12.5-12.8	1.25-1.28	≥11.4	≥907	≥12	≥955	38-41	302-326	≤80
N42	12.8-13.2	1.28-1.32	≥11.5	≥915	≥12	≥955	40-43	318-342	≤80
N45	13.2-13.8	1.32-1.38	≥11.6	≥923	≥12	≥955	43-46	342-366	≤80
N48	13.8-14.2	1.38-1.42	≥11.6	≥923	≥12	≥955	46-49	366-390	≤80
N50	14.0-14.5	1.40-1.45	≥10	≥796	≥12	≥955	48-51	382-406	≤80
N52	14.3-14.8	1.43-1.48	≥10	≥796	≥12	≥955	50-53	398-422	≤80
35M	11.7-12.2	1.17-1.22	≥10.9	≥868	≥14	≥1114	33-36	263-287	≤100
38M	12.2-12.5	1.22-1.25	≥11.3	≥899	≥14	≥1114	36-39	287-310	≤100
40M	12.5-12.8	1.25-1.28	≥11.6	≥923	≥14	≥1114	38-41	302-326	≤100
42M	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	40-43	318-342	≤100
45M	13.2-13.8	1.32-1.38	≥12.5	≥995	≥14	≥1114	43-46	342-366	≤100
48M	13.8-14.3	1.38-1.43	≥12.9	≥1027	≥14	≥1114	46-49	366-390	≤100
50M	14.0-14.5	1.40-1.45	≥13	≥1033	≥13.5	≥1075	48-51	382-406	≤100
52M	14.2-14.7	1.42-1.47	≥13	≥1033	≥13	≥1035	49-53	390-422	≤100
35H	11.7-12.2	1.17-1.22	≥10.9	≥868	≥17	≥1353	33-36	263-287	≤120
38H	12.2-12.5	1.22-1.25	≥11.3	≥899	≥17	≥1353	36-39	287-310	≤120
40H	12.5-12.8	1.25-1.28	≥11.6	≥923	≥17	≥1353	38-41	302-326	≤120
42H	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	40-43	318-342	≤120
45H	13.2-13.7	1.32-1.37	≥12.1	≥963	≥17	≥1353	43-46	342-366	≤120
48H	13.7-14.3	1.37-1.43	≥12.2	≥971	≥17	≥1353	46-49	366-390	≤120
50H	13.9-14.5	1.39-1.45	≥13	≥1035	≥17	≥1353	47-51	374-406	≤120
33SH	11.3-11.8	1.13-1.18	≥10.6	≥844	≥20	≥1592	31-34	247-271	≤150
35SH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥20	≥1592	33-36	263-287	≤150
38SH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥20	≥1592	36-39	287-310	≤150
40SH	12.5-12.8	1.25-1.28	≥11.8	≥939	≥20	≥1592	38-41	302-326	≤150
42SH	12.8-13.2	1.28-1.32	≥12.4	≥971	≥20	≥1592	40-43	318-342	≤150
45SH	13.2-13.7	1.32-1.37	≥12.3	≥995	≥20	≥1592	43-46	342-366	≤150
48SH	13.7-14.2	1.37-1.42	≥12.5	≥995	≥20	≥1592	45-49	358-390	≥150
28UH	10.2-10.8	1.02-1.08	≥9.6	≥764	≥25	≥1990	26-29	207-231	≥180
30UH	10.8-11.4	1.08-1.14	≥10.2	≥812	≥25	≥1990	28-32	223-254	≤180
33UH	11.3-11.8	1.13-1.18	≥10.7	≥852	≥25	≥1990	31-34	247-270	≤180
35UH	11.7-12.2	1.17-1.22	≥10.8	≥860	≥25	≥1990	33-36	263-287	≤180
38UH	12.2-12.5	1.22-1.25	≥11	≥876	≥25	≥1990	36-39	287-310	≤180
40UH	12.5-12.8	1.25-1.28	≥11.5	≥915	≥25	≥1990	38-41	302-326	≤180
42UH	12.8-13.2	1.28-1.32	≥12.2	≥971	≥24	≥1911	39-43	310-342	≤180
28EH	10.4-10.9	1.04-1.09	≥9.8	≥780	≥30	≥2388	26-29	207-231	≤200
30EH	10.8-11.4	1.08-1.14	≥10.2	≥812	≥30	≥2388	28-32	223-255	≤200
33EH	11.3-11.8	1.13-1.18	≥10.3	≥820	≥30	≥2388	31-34	247-270	≤200
35EH	11.7-12.2	1.17-1.22	≥10.5	≥836	≥30	≥2388	33-36	263-287	≤200
38EH	12.2-12.5	1.22-1.25	≥11.5	≥915	≥30	≥2388	35-39	279-310	≤200

Neodymium Magnets Physical Properties & Application to Environment of the Coating

Coating Material	Surface Colour	Properties	Environment of Application	Thickness of Coating layer
Zine	Blue, Black and rainbow etc	Compact, Stable and Homogeneous	With reasonalbe capability of anticorrosion	6um≤∮≤12
Nickel-Copper-Nickel	White and black	Light and Stable	Suitable for higher corrosive environment	15μm≤∮≤30pm
Phosphorization	Colorless or light gray	uniform thickness	short-term anticorrosion
Epoxy	Black and Gray	layer with certain luster, insurability	Suitable for higher corrosive environment	≥15μm
Parylene	transparency	uniform thickness, density pinholes-free and insurability	Excellent capability of anticorrosion especially for small items	0.1μm≤∮≤100pm
Ni+Cu+Epoxy	Black	Layer with certain luster	salt spray resistance>300hr	10-30μm
		insurability and stability	Excellent capability of
			anticorrosion. Suitable for
			hostile environment
			salt spray resistance>300hr