Magnetic Grades

Neodymium Magnets (NdFeB)

Neodymium (NdFeB) magnets offer the highest magnetic strength of any commercially available permanent magnet material. They are widely used where compact size, strong holding force, and consistent performance are critical.

GUK Magnetics supplies neodymium magnets for both defined production requirements and more specialised applications, supporting customers with technical guidance on grade selection, magnetisation, coatings and repeatable supply.

Submit Drawing or Specifications → Request a Quote →

Grades, Temperature & Performance

We supply a wide range of neodymium grades to accommodate your magnetic pull force and operating temperature requirements. Our team can advise on grade selection to ensure the magnet performs reliably in service.

Dimensions & Geometries

Neodymium magnets can be manufactured to your specific dimensions. Common industrial formats including discs, blocks, rings, arcs, and countersunk designs are supported, as well as custom geometries where standard options are not suitable.

Magnetisation & Tolerances

Magnetisation direction and dimensional tolerances are critical to performance. We support axial, diametric, and application-defined magnetisation, with controlled tolerances for assembly and repeatability.

Coatings & Environmental Protection

Neodymium magnets require appropriate surface protection for most industrial environments. We can advise on coating selection based on humidity, corrosion risk, handling and assembly processes.

ISO9001 Quality & Reliable Supply

We focus on realistic lead times, clear delivery expectations, and repeatable supply under ISO 9001 processes - helping customers plan with confidence and avoid unexpected disruption.

Magnetic Assemblies & Integration

Neodymium magnets are frequently supplied for integration into housings, fixtures, and assemblies. We support formats and magnetisation patterns suited to installation, alignment, and end-use performance

Neodymium Magnetic Grades

	A	B	C	D	E	F	G	H	I	J	K	L
Item	Grade	Remanence		Coercivity				Max Energy Product		Temperature Coefficient		Max Working Temperature
		Br		HcB		HcJ		(BH)max		(Br)	(Hcj)	TwMax
		T	kGs	kA/m	kOe	kA/m	kOe	KJ/m³	MGOe	%/°C	%/°C	°C
N	N35	1.17-1.22	11.7-12.2	≥860	≥10.8	≥955	≥12	263-287	33-36	-0.10 ~ -0.12	-0.4 ~ 0.6	≤80
	N38	1.23-1.25	12.3-13.0	≥876	≥11	≥955	≥12	287-318	36-40			≤80
	N40	1.26-1.32	12.6-13.2	≥876	≥11	≥955	≥12	302-334	38-42			≤80
	N42	1.29-1.35	12.9-13.5	≥876	≥11	≥955	≥12	318-350	40-44			≤80
	N45	1.32-1.38	13.2-13.8	≥876	≥11	≥955	≥12	334-366	42-46			≤80
	N48	1.37-1.43	13.7-14.3	≥876	≥11	≥955	≥12	358-390	45-49			≤80
	N50	1.40-1.45	14.0-14.5	≥876	≥11	≥955	≥12	374-406	47-51			≤80
	N52	1.42-1.48	14.2-14.8	≥836	≥10.5	≥876	≥11	390-422	49-53			≤80
	N55	1.46-1.51	14.6-15.1	≥860	≥10.8	≥955	≥12	406-438	51-55			≤80
M	N35M	1.17-1.22	11.7-12.2	≥868	≥10.9	≥1114	≥14	263-287	33-36			≤100
	N38M	1.23-1.30	12.3-13.0	≥915	≥11.5	≥1114	≥14	287-318	36-40			≤100
	N40M	1.26-1.32	12.6-13.2	≥963	≥12.1	≥1114	≥14	302-334	38-42			≤100
	N42M	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1114	≥14	318-350	40-44			≤100
	N45M	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1114	≥14	334-366	42-46			≤100
	N48M	1.37-1.43	13.7-14.3	≥1019	≥12.8	≥1114	≥14	358-390	45-49			≤100
	N50M	1.40-1.45	14.0-14.5	≥1043	≥13.1	≥1114	≥14	374-406	47-51			≤100
	N52M	1.42-1.48	14.2-14.8	≥1059	≥13.3	≥1114	≥14	390-422	49-53			≤100
	N54M	1.46-1.51	14.6-15.1	≥995	≥12.5	≥1035	≥13	406-438	51-55			≤100
H	N35H	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1353	≥17	263-295	33-37			≤120
	N38H	1.23-1.30	12.3-13.0	≥915	≥11.5	≥1353	≥17	286-318	36-40			≤120
	N40H	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1353	≥17	302-334	38-42			≤120
	N42H	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1353	≥17	318-350	40-44			≤120
	N45H	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1353	≥17	334-366	42-46			≤120
	N48H	1.37-1.43	13.7-14.3	≥1011	≥12.7	≥1353	≥17	358-392	45-49			≤120
	N50H	1.40-1.45	14.0-14.5	≥1027	≥12.9	≥1353	≥17	374-406	47-51			≤120
	N52H	1.42-1.48	14.2-14.8	≥1059	≥13.3	≥1353	≥17	390-422	49-53			≤120
SH	N33SH	1.14-1.21	11.4-12.1	≥852	≥10.7	≥1592	≥20	247-279	31-35			≤150
	N35SH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1592	≥20	263-295	33-37			≤150
	N38SH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥1592	≥20	287-318	36-40			≤150
	N40SH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1592	≥20	302-334	38-42			≤150
	N42SH	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1592	≥20	318-350	40-44			≤150
	N45SH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1592	≥20	334-366	42-46			≤150
	N48SH	1.37-1.43	13.7-14.3	≥1011	≥12.7	≥1592	≥20	358-390	45-49			≤150
	N50SH	1.40-1.45	14.0-14.5	≥1027	≥12.9	≥1592	≥20	374-406	47-51			≤150
	N52SH	1.42-1.48	14.2-14.8	≥1035	≥13	≥1512	≥19	390-422	49-53			≤150
UH	N30UH	1.08-1.13	10.8-11.3	≥796	≥10.0	≥1990	≥25	223-247	28-31			≤180
	N33UH	1.14-1.18	11.4-11.8	≥852	≥10.5	≥1990	≥25	247-279	31-35			≤180
	N35UH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1990	≥25	263-295	33-37			≤180
	N38UH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥1990	≥25	287-318	36-40			≤180
	N40UH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1990	≥25	302-334	38-42			≤180
	N42UH	1.28-1.35	12.8-13.5	≥963	≥12.1	≥1990	≥25	310-350	39-44			≤180
	N45UH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1990	≥25	334-366	42-46			≤180
	N48UH	1.37-1.42	13.7-14.2	≥1019	≥12.8	≥1910	≥24	358-390	45-49			≤180
	N50UH	1.39-1.45	13.9-14.5	≥995	≥12.5	≥1990	≥25	374-406	47-51			≤180
EH	N30EH	1.08-1.15	10.8-11.5	≥812	≥10.2	≥2388	≥30	223-255	28-32			≤200
	N33EH	1.14-1.21	11.4-12.1	≥851	≥10.7	≥2388	≥30	247-279	31-35			≤200
	N38EH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥2388	≥30	263-295	33-37			≤200
	N38EH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥2388	≥30	287-318	36-40			≤200
	N40EH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥2388	≥30	302-334	38-42			≤200
	N42EH	1.28-1.35	12.8-13.5	≥963	≥12.1	≥2388	≥30	318-350	39-44			≤200
	N45EH	1.33-1.38	13.3-13.8	≥995	≥12.5	≥2308	≥29	334-366	42-46			≤200
AH	N28AH	1.04-1.12	10.4-11.2	≥772	≥9.7	≥2786	≥35	207-239	26-30			≤230
	N30AH	1.08-1.15	10.8-11.5	≥812	≥10.2	≥2786	≥35	223-255	28-32			≤230
	N33AH	1.14-1.21	11.4-12.1	≥852	≥10.7	≥2786	≥35	247-279	31-35			≤230
	N35AH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥2786	≥35	263-295	33-37			≤230
	N38AH	1.23-1.27	12.3-12.7	≥923	≥11.6	≥2786	≥35	287-318	36-40			≤230
	N40AH	1.26-1.31	12.6-13.1	≥939	≥11.8	≥628	≥33	302-334	38-42			≤230
	N42AH	1.29-1.35	12.9-13.5	≥955	≥12.0	≥2628	≥33	318-350	40-44			≤230
Diffusion Process
SH	G48SH	1.37-1.42	13.7-14.2	≥1011	≥13	≥1592	≥20	358-390	45-49			≤150
	G50SH	1.40-1.45	14.0-14.5	≥1027	≥13.2	≥1592	≥20	374-406	47-51			≤150
	G52SH	1.42-1.48	14.2-14.8	≥1067	≥13.4	≥1592	≥20	390-422	49-53			≤150
	G55SH	1.46-1.51	14.6-15.1	≥1083	≥13.6	≥1592	≥20	406-438	51-55			≤150
UH	G45UH	1.33-1.38	13.7-13.8	≥978	≥12.4	≥1990	≥25	334-366	42-46			≤180
	G48UH	1.37-1.42	13.7-14.2	≥1027	≥12.9	≥1990	≥25	358-390	45-49			≤180
	G50UH	1.40-1.45	14.0-14.5	≥1051	≥13.2	≥1990	≥25	374-406	47-51			≤180
	G52UH	1.42-1.48	14.2-14.8	≥1067	≥13.4	≥1990	≥25	390-422	49-53			≤180
	G54UH	1.46-1.51	14.6-15.1	≥1075	≥13.5	≥1990	≥25	406-438	51-55			≤180
EH	G40EH	1.26-1.31	12.6-13.1	≥955	≥12.0	≥2388	≥30	302-334	38-42			≤200
	G44EH	1.29-1.35	12.9-13.5	≥971	≥12.2	≥2388	≥30	318-350	40-44			≤200
	G46EH	1.33-1.38	13.3-13.8	≥1011	≥12.7	≥2388	≥30	334-366	42-46			≤200
	G48EH	1.37-1.42	13.7-14.2	≥1027	≥12.9	≥2388	≥30	358-390	45-49			≤200
	G50EH	1.40-1.45	14.0-14.5	≥1051	≥13.2	≥2308	≥29	374-406	47-51			≤200

Neo Bonded Magnets

	A	B	C	D	E	F	G	H	I	J	K
Item	Grade	Remanence		Coercivity				Max Energy Product		Max Working Temperature	Density
		Br		HcB		HcJ		(BH)max		TwMax	P
		T	kGs	kA/m	kOe	kA/m	kOe	KJ/m³	MGOe	°C	g/cm³
Compression Moulding NdFeB Magnet	KBM-2	0.30-0.40	3.0-4.0	160-240	2.0-3.0	420-640	6.0-8.0	16-24	2.0-3.0	≤120	4.5-6.0
	KBM-4	0.40-0.50	4.0-5.0	240-320	3.0-4.0	560-720	7.0-9.0	32-44	4.0-5.5	≤120	5.2-6.0
	KBM-6	0.50-0.60	5.0-6.0	320-400	4.0-5.0	430-640	6.0-8.0	48-60	6.0-7.5	≤120	5.5-6.0
	KBM-8	0.60-0.68	6.0-6.8	360-440	4.5-5.5	640-800	8.0-10.0	64-72	8.0-9.0	≤150	5.8-6.1
	KBM-8H	0.60-0.65	6.0-6.5	400-480	5.0-6.0	1120-1230	14.0-16.0	60-68	7.5-8.5	≤160	5.8-6.2
	KBM-8L	0.65-0.68	6.5-6.8	400-480	5.0-6.0	900-1120	11.0-14.0	64-72	8.0-9.0	≤160	5.8-6.2
	KBM-9	0.60.0.68	6.0-6.8	400-480	5.0-6.0	640-800	8.0-10.0	68-72	8.5-9.0	≤150	5.8-6.2
	KBM-10	0.68-0.73	6.8-7.3	400-480	5.0-6.0	640-800	8.0-10.0	76-84	9.5-10.5	≤150	5.8-6.2
	KBM-12	0.71-0.75	7.1-7.5	440-520	5.5-6.5	720-800	9.0-10.0	84-96	10.5-12.0	≤150	6.0-6.2
	KBM-12L	0.72-0.76	7.2-7.6	400-480	5.0-6.0	480-640	6.0-8.0	84-96	10.5-12.0	≤140	6.0-6.2
Injection Moulding NdFeB Magnet	KBI-3	0.20-0.30	2.0-3.0	160-240	2.0-3.0	480-640	6.0-8.0	12-24	1.5-3.0	≤100	3.9-4.4
	KBI-4	0.35-0.45	3.5-4.5	240-320	3.0-4.0	560-720	7.0-9.0	24-36	3.0-4.5	≤120	4.2-4.9
	KBI-5	0.45-0.52	4.5-5.2	320-360	4.0-4.5	560-720	7.0-9.0	36-44	4.5-5.5	≤120	4.5-5.0
	KBI-5H (PPS)	0.48-0.52	4.8-5.2	400-480	5.0-6.0	380-1040	11.0-13.0	36-44	4.5-5.5	≤150	4.9-5.4
	KBI-6	0.50-0.55	5.0-5.5	320-440	4.0-5.5	640-800	8.0-10.0	44-52	5.5-6.5	≤120	4.7-5.1
	KBI-7	0.54-0.64	5.4-6.4	320-400	4.0-5.5	640-800	8.0-10.0	52-60	6.5-7.5	≤120	5.0-5.5
	KBI-8	0.64-0.74	6.4-7.4	400-480	5.0-6.0	640-803	8.0-10.0	68-76	8.5-9.5	≤120	5.0-5.9

Coatings & Corrosion Protection

Neodymium magnets are susceptible to corrosion if left unprotected. We offer a range of coating options depending on the environment and application, including Ni-Cu-Ni (Nickel), Epoxy and Zinc.

Our full range of coatings and technical specifications are available for download below. We can advise on coating suitability for your specific application requirement or environmental factors, such as humidity, outdoor use, chemical exposure or assembly processes.

Coating Comparison Table →

FAQs

Our dedicated team is always ready to assist you with any additional questions or requirements you may have.

Samarium Cobalt Magnets (SmCo)

Samarium Cobalt (SmCo) magnets are selected for applications where thermal stability, corrosion resistance and consistent magnetic performance are critical. While offering lower maximum strength than neodymium, SmCo magnets perform reliably at elevated temperatures and in demanding environments where NdFeB may not be suitable.

GUK Magnetics supplies SmCo magnets for both standard production and specialist applications requiring stable performance over a wide operating temperature range.

Submit Drawing or Specifications → Request A Quote →

Samarium Cobalt Magnets (SmCo) Brochure

Extensive range of grades & sizes

We provide a diverse selection of SmCo magnets available in various grades, shapes, and sizes - made to specification to meet your requirements.

ISO 9001 CERTIFIED

All SmCo magnets are supplied to controlled specifications and manufactured using approved processes, ensuring consistent quality and repeatable performance across production and repeat orders.

USED IN DEMANDING APPLICATIONS

SmCo magnets supplied by GUK are used in motors, sensors, aerospace systems, medical equipment, and high-temperature industrial applications where reliability and stability outweigh maximum magnetic strength.

PRACTICAL TECHNICAL SUPPORT

Our team provides technical advice on grade selection, temperature limits, magnetisation direction, and mechanical considerations - helping ensure SmCo is the right choice over alternative materials.

RELIABLE DELIVERY & SUPPLY

We focus on realistic lead times, clear delivery expectations, and dependable repeat supply - helping customers plan with confidence and avoid unexpected disruption.

CUSTOM MAGNET CONFIGURATIONS

Where standard formats are unsuitable, we support custom shapes, magnetisation patterns, and assemblies - supplying SmCo magnets tailored to specific application and installation requirements.

Samarium Cobalt Magnetic Grades

	A	B	C	D	E	F	G	H	I	J	K	L	M	N
Item	Grade	GBT 4180-2012	Remanence		Coercivity				Max Energy Product		Max Working Temperature	Density	Temperature Coefficient of Br	Temperature Coefficient of Hcj
			Br		Hcb		HcJ		(BH)max		Tw Max	P	a (Br)	a (Hcj)
			T	kGs	kA/m	kOe	kA/m	kOe	KJ/m³	MGOe	°C	°C	% / °C	% / °C
Sm1Co5	Sm1Co5-16	XG1S 135/96	0.79-0.84	7.9-8.4	620-660	7.8-8.3	≥1830	≥23	118-135	15-17	≤250	8.3	-0.035	-0.28
	Sm1Co5-18	XG1S 143/160	0.84-0.89	8.4-8.9	660-700	8.3-8.8	≥1830	≥23	135-151	17-19	≤250	8.3	-0.04	-0.28
	Sm1Co5-20	XG1S 159/140	0.89-0.93	8.9-9.3	684-732	8.6-9.2	≥1830	≥23	150-167	19-21	≤250	8.3	-0.045	-0.28
	Sm1Co5-22	XG1S 175/140	0.92-0.96	9.2-9.6	710-756	8.9-9.5	≥1830	≥23	167-183	21-23	≤250	8.3	-0.045	-0.28
	Sm1Co5-24	/	0.96-1.00	9.6-10.0	740-788	9.3-9.9	≥1830	≥23	183-199	23-25	≤250	8.3	-0.045	-0.28
Sm2Co17	Sm2Co17-24L	/	0.95-1.02	9.5-10.2	541-716	6.8-9.0	636-955	8-12	175-191	22-24	≤250	8.4	-0.025	-0.28
	Sm2Co17-26L	XGS 207/50	1.02-1.05	10.2-10.5	541-784	6.8-9.4	636-955	8-12	191-207	24-26	≤250	8.4	-0.035	-0.2
	Sm2Co17-28L	XGS 223/50	1.03-1.08	10.3-10.8	541-764	6.8.-9.6	636-955	8-12	207-220	26-28	≤250	8.4	-0.035	-0.2
	Sm2Co17-30L	/	1.08-1.10	10.8-11.0	541-796	6.8-10.0	636-955	8-12	223-239	28-30	≤250	8.4	-0.035	-0.2
	Sm2Co17-32L	/	1.10-1.15	11.0-11.5	541--812	6.8-10.2	636-955	8-12	231-255	29-32	≤250	8.4	-0.035	-0.2
	Sm2Co17-26M	XGS 207/80	1.02-1.05	10.2-10.5	676-780	8.5-9.8	955-1433	12-18	191-207	24-26	≤300	8.4	-0.035	-0.2
	Sm2Co17-28M	XGS 223/80	1.03-1.08	10.3-10.8	676-796	8.5-10.0	955-1433	12-18	207-220	26-28	≤300	8.4	-0.035	-0.2
	Sm2Co17-30M	XGS 239/80	1.08-1.10	10.8-11.0	676-835	8.5-10.5	955-1433	12-18	223-239	28-30	≤300	8.4	-0.035	-0.2
	Sm2Co17-32M	/	1.10-1.15	11.0-11.5	676-852	8.5-10.7	955-1433	12-18	231-255	29-32	≤300	8.4	-0.035	-0.2
	Sm2Co17-33M	/	1.13-1.15	11.3-11.5	820-870	10.3-10.9	955-1433	12-18	246-262	31-32	≤300	8.4	-0.039	-0.22
	Sm2Co17-22	/	0.93-0.97	9.3-9.7	676-740	8.5-9.3	≥1433	≥18	160-183	20-23	≤300	8.4	-0.02	-0.2
	Sm2Co17-24	/	0.95-1.02	9.5-10.2	692-764	8.7-9.6	≥1433	≥18	175-191	22-24	≤300	8.4	-0.025	-0.2
	Sm2Co17-26	XGS 207/160	1.02-1.05	10.2-10.5	748-796	9.4-10.0	≥1433	≥18	191-207	24-26	≤300	8.4	-0.03	-0.2
	Sm2Co17-28	XGS 223/160	1.03-1.08	10.3-10.8	756-812	9.5-10.2	≥1433	≥18	207-220	26-28	≤300	8.4	-0.035	-0.2
	Sm2Co17-30	XGS 223/247	1.08-1.10	10.8-11.0	788-835	9.9-10.5	≥1433	≥18	220-240	28-30	≤300	8.4	-0.035	-0.2
	Sm2Co17-32	/	1.10-1.13	11.0-11.3	812-860	10.2-10.8	≥1433	≥18	230-255	29-32	≤300	8.4	-0.035	-0.2
	Sm2Co17-33	/	1.13-1.15	11.3-11.5	820-870	10.3-10.9	≥1433	≥18	246-262	31-32	≤300	8.4	-0.039	-0.22
	Sm2Co17-24H	XGS 191/200	0.95-1.02	9.5-10.2	692-764	8.7-9.6	≥1990	≥25	175-191	22-24	≤350	8.4	-0.025	-0.2
	Sm2Co17-26H	XGS 207/200	1.02-1.05	10.2-10.5	748-796	9.4-10.0	≥1990	≥25	191-207	24-26	≤350	8.4	-0.03	-0.2
	Sm2Co17-28H	XGS 223/200	1.03-1.08	10.3-10.8	756-812	9.5-10.2	≥1990	≥25	207-220	26-28	≤350	8.4	-0.035	-0.2
	Sm2Co17-30H	XGS 239/160	1.08-1.10	10.8-11.0	788-835	9.9-10.5	≥1990	≥25	223-239	28-30	≤350	8.4	-0.035	-0.2
	Sm2Co17-32H	/	1.10-1.13	11.0-11.3	812--860	10.2-10.8	≥1990	≥25	230-255	29-32	≤350	8.4	-0.035	-0.2
	Sm2Co17-33H	/	1.13-1.15	11.3-11.5	830-880	10.4-11	≥1990	≥25	246-262	31-32	≤350	8.4	-0.039	-0.22
	Sm2Co17-35H	/	1.16-1.21	11.6-12.1	≥855	≥10.7	≥2000	≥25	255-279	32-35	≤200	8.4	-0.039	-0.25
Sm2Co17-TR	Sm2Co17-20TR	/	0.9-0.94	9.0-9.4	661-732	8.3-9.2	≥1592	≥20	143-159	18-20	≤500	8.4	-0.035	-0.15
Sm2Co17-TR	Sm2Co17-16LT	/	0.81-0.85	8.1-8.5	605-669	7.6-8.4	≥1592	≥20	111-127	14-16	≤300	8.4	Temperature range -50 oC -20 oC 20 oC -200 oC 200 oC -300 oC	Temperature Coefficient of Br +0.005%/ oC -0.008%/ oC -0.011%/ oC
	Sm2Co17-18LT	/	0.85-0.9	8.5-9.0	629-708	7.9-8.9	≥1592	≥20	127-143	16-18	≤300	8.4
	Sm2Co17-20LT	/	0.9-0.94	9.0-9.4	661-732	8.3-9.2	≥1592	≥20	143-159	18-20	≤300	8.4
	Sm2Co17-22LT	/	0.94-0.97	9.4-9.7	685-740	8.6-9.3	≥1592	≥20	159-175	20-22	≤300	8.4

Key Considerations for SmCO Magnets

SmCo magnets are typically selected when applications involve either sustained operating temperatures above ~180–200 °C, chemically aggressive or corrosive environments, or tight magnetic stability requirements over temperature. If maximum magnetic strength is the priority, neodymium may be more suitable.

It is also important to note that SmCo magnets are hard and brittle. We provide guidance on handling, tolerances, edge conditions, and assembly integration to reduce risk during manufacture and installation, but care should be taken to avoid contact either in the application or in the assembly of the product it is used in.

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Our dedicated team is always ready to assist you with any additional questions or requirements you may have.

AlNiCo Magnets

AlNiCo (Aluminium–Nickel–Cobalt) magnets were originally developed in the mid-20th century and, while largely replaced by ferrite and rare earth materials for general use, they remain essential in applications requiring magnetic stability, predictable output, and high temperature tolerance.

GUK Magnetics supplies AlNiCo magnets for instrumentation, sensing, control, and specialist applications where consistent magnetic behaviour matters more than maximum strength.

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AlNiCo Magnets Brochure

Extensive Range of Grades & Sizes

We supply AlNiCo magnets across multiple grades - including common series such as AlNiCo 5 and AlNiCo 8 - in a wide range of shapes and dimensions. Standard formats are available alongside custom geometries where application constraints demand it.

ISO 9001 Certified

All AlNiCo magnets are supplied to controlled specifications and manufactured using approved processes, ensuring consistent quality and repeatable performance across production and repeat orders.

Stable Magnetic Performance

AlNiCo magnets are valued for their high remanence and stable magnetic output, with performance changing by only ~2% per 100 °C temperature rise. This makes them particularly suitable for applications requiring predictable behaviour over wide temperature ranges.

High-Temperature Capability

With Curie temperatures up to ~800 °C and typical operating ranges well beyond neodymium or ferrite, AlNiCo magnets are suited to environments involving sustained heat exposure without degradation.

Practical Engineering Support

AlNiCo magnets have low coercivity and non-linear demagnetisation curves, making magnet design critical. Our team provides guidance on length-to-diameter ratios, magnetisation direction, tolerances, and handling to reduce the risk of in-service demagnetisation.

RELIABLE DELIVERY & SUPPLY

We focus on realistic lead times, clear delivery expectations, and dependable repeat supply - helping customers plan with confidence and avoid unexpected disruption.

AlNiCo Magnetic Grades

	A	B	C	D	E	F	G	H	I	J	K	L
Grade	Remanence		Coercivity				Max Energy Product		Temp Coefficient		Max working	MMPA
	Br		HcB		HcJ		(BH)max		TK(Br) %/K	TK(Hcj) %/K	Tw max
	kGs	mT	kOe	kAlrn	kOe	kA/m	MGOe	KJ/m³	TK(Br) %/K	TK(Hcj) %/K	°C
ISOTROPIC CAST ALNICO
LN10	6.5	650	0.48	38	0.5	40	1.25	10	-0.035	-0.025	450	ALNICO 3
LNG12	7.5	750	0.56	45	0.58	46	1.5	12	-0.03	-0.02	450	ALNICO 2
LNGT18	5.5	550	1.13	90	1.21	97	2.25	18	-0.025	0.01	550	ALNICO 8
ANISOTROPC CAST ALNICO
LNG34	11	1100	0.63	50	0.65	52	4.25	34	-0.02	0.01	525	ALNICO 5
LNG37	11.8	1180	0.61	49	0.64	51	4.63	37	-0.02	0.01	525
LNG40	12	1200	0.63	50	0.65	52	5	40	-0.02	0.01	525
LNG44	12.5	1250	0.65	52	0.68	54	5.5	44	-0.02	0.01	525
LNGT34	11.5	1150	0.73	58	0.75	60	3.5	28	-0.02	0.03	525	ALNICO 6
LNG52	13	1300	0.7	56	0.73	58	6.5	52	-0.02	0.03	525	ALNICO 5DG
LNG60	13.5	1350	0.73	58	0.75	60	7.5	60	-0.02	0.03	525	ALNICO 5-7
LNGT38	8	800	1.38	110	1.4	112	4.75	38	-0.025	0.01	550	ALNICO 8
LNGT40	8.5	850	1.44	115	1.46	117	5	40	-0.025	0.01	550
LNGT44	9	900	1.44	115	1.46	117	5.5	44	-0.025	0.01	550
LNGT36J	7.2	720	1.88	150	1.9	152	4.5	36	-0.025	0.01	550	ALNICO 8HC
LNGT6O	10	1000	1.38	110	1.4	112	7.5	60	-0.025	0.01	550	ALNICO 9
LNGT72	10.5	1050	1.44	115	1.46	117	9	72	-0.025	0.01	550
LNGT80	10.8	1080	1.5	120	1.53	122	10	80	-0.025	0.01	550
ISOTROPIC SINTERED ALNICO
FLNG10	6.5	650	0.5	4	0.53	42	1.25	10	-0.03	-0.02	450	ALNICO 3
FLNG12	7.5	750	0.56	45	0.58	46	1.5	12	-0.03	-0.02	450	ALNICO 2
FLNGT18	6	600	1.19	95	1.23	98	2.25	18	-0.025	0.01	550	ALNICO 8
FLNGT20	6.2	620	1.25	100	1.31	105	2.5	20	-0.025	0.01	550	ALNICO 8
ANISOTROPIC SINTERED ALNICO
FLNG34	11.5	1150	0.6	48	0.63	50	4.25	34	-0.02	0.01	525	ALNICO 5
FLNGT28	11	1100	0.73	58	0.75	60	3.5	28	-0.02	0.03	525	ALNICO 6
FLNGT36J	7.2	720	1.88	150	1.9	152	4.5	36	-0.025	0.01	550	ALNICO 8HC
FLNGT38	8	800	1.38	110	1.4	112	4.75	38	-0.025	0.01	550	ALNICO 8
FLNGT44	8.5	850	1.5	120	1.53	122	5.5	44	-0.025	0.01	550
FLNGT48	9.2	920	1.56	125	1.59	127	6	48	-0.025	0.01	550
BONDED ALNICO (BEARING)
B-LNG7	3.1	310	1	79.63	1.3	103.5	0.85	6.77	-0.02	0.01	200
B-LNG8	3.4	340	1.05	83.612	1.35	107.5	1	7.96	-0.02	0.01	200

Understanding AlNiCo Magnet Behaviour

Although AlNiCo magnets exhibit high remanence, their low coercivity means geometry and magnetic circuit design are critical. Maintaining appropriate length-to-diameter ratios is essential to prevent unintended demagnetisation during use.

AlNiCo magnets are chemically inert, corrosion resistant, and do not require coatings. However, they are mechanically hard and brittle, so mechanical impact should be avoided during handling and assembly. Where required, GUK Magnetics also supplies bonded AlNiCo magnets, produced by combining AlNiCo powder with epoxy binders. These are used where shape flexibility or specific magnetic characteristics are required.

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Our dedicated team is always ready to assist you with any additional queries or requirements you may have.

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Ferrite Magnets

Ferrite magnets (also known as ceramic magnets) are a reliable, cost-effective choice for applications where stable magnetic performance and corrosion resistance matter more than maximum magnetic strength. Widely used across motors, sensors, fixtures and general industrial assemblies, ferrite magnets offer predictable performance in demanding production environments.

GUK Magnetics supplies ferrite magnets across a wide range of grades, shapes, and dimensions – supporting both defined production specifications and applications where cost, geometry, or operating conditions need careful consideration.

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Ferrite Magnets Brochure

Wide Range of Grades & Dimensions

We supply ferrite magnets in common grades such as Y30, Y33, Y35, and Y40, across blocks, discs, rings, segments, and custom geometries - supporting both standard formats and application-specific designs.

ISO 9001 CERTIFIED

All Ferrite magnets are supplied to controlled specifications and manufactured using approved processes, ensuring consistent quality and repeatable performance across production and repeat orders.

PRACTICAL TECHNICAL SUPPORT

Our experts provide straightforward technical input on grade selection, magnetisation direction, tolerances, and coatings, ensuring the magnet supplied performs as intended in service.

Cost-Effective for Production Volumes

Ferrite magnets are often chosen for high-volume and cost-sensitive applications, offering excellent value where space constraints are less critical than with rare-earth materials.

Custom magnet configurations

Where standard formats aren’t suitable, we support custom dimensions, magnetisation patterns, and assemblies - supplying magnets tailored to your specific application and installation requirements.

Reliable delivery & supply

We focus on realistic lead times, clear delivery expectations, and repeatable supply - helping customers plan with confidence and avoid unexpected disruption.

Ferrite Magnetic Grades

	A	B	C	D	E	F	G	H	I	J
Grade	Equivalent	Remanence		Coercivity				Max Energy Product		Max Working Temp.
		Br		Hcb		Hcj		(BH)max		Twmax
		mT	KGs	kA/m	kOe	KA/m	kOe	kj/m³	MGOe	°C
XM10T	Y10T	200-235	2.0-2.35	128-160	1.61-2.01	210-280	2.64-3.52	6.4-9.6	0.8-1.2	250
XM25	Y25	360-400	3.6-4.0	135-170	1.70-2.14	140-200	1.76-2.51	22.5-28.0	2.8-3.5
XM30BH	Y30BH	380-400	3.8-4.0	223-235	2.80-2.95	231-245	2.90-3.08	27.0-30.0	3.4-3.8
XM20H-1	Y30h-1	380-400	3.8-4.0	230-275	2.89-3.46	235-290	2.95-3.64	27.0-32.5	3.4-4.1
XM30H-2	Y30H-2	395-415	3.95-4.15	275-300	3.46-3.77	310-335	3.90-4.21	27.0-32.0	3.4-4.0
XM33	Y33	410-430	4.1-4.3	220-250	2.76-3.14	225-255	2.83-3.20	31.5-35.0	4.0-4.4
XM33H	Y33H	410-430	4.1-4.3	250-270	3.14-3.39	250-275	3.14-3.46	31.5-35.0	4.0-4.4
XM35	Y35	400-440	4.0-4.4	176-224	2.22-2.8	180-230	2.26-2.89	30.3-33.4	3.8-4.2
XM4350		420-440	4.2-4.4	294-326	3.7-4.1	386-410	4.85-5.15	33.4-36.6	4.2-4.6
XM4545		440-460	4.4-4.6	318-350	4.0-4.4	347-370	4.35-4.65	36.6-39.8	4.6-5.0
XM4636		450-470	4.5-4.7	255-279	3.2-3.5	275-299	3.45-3.75	38.3-41.5	4.8-5.2
XM4654	TDK FB12H	450-470	4.5-4.7	330-360	4.15-4.45	415-445	5.25-5.55	39.8-43.0	5.0-5.4
XM4748	TDK FB12B	460-480	4.6-4.8	328-352	4.15-4.4	368-392	4.65-4.95	41.5-44.7	5.2-5.6

Ferrite Magnets: Key Design & Application Considerations

Ferrite magnets have relatively low magnetic properties compared to other permanent magnet materials, but offer a strong energy-product-to-cost ratio. As a ceramic material, ferrite does not rust, making it an excellent choice around water or corrosive environments. It is typically used uncoated in applications where space constraints are less critical and stable performance is sufficient.

Ferrite magnets perform poorly under temperature extremes and, due to their sintered ceramic structure, are mechanically brittle. Where higher performance, compact geometry, or elevated temperature stability are critical, rare-earth materials are generally more appropriate.

Enquire about grade or application suitability →

Ferrite Magnets: Key Design & Application Considerations

FAQs

Our dedicated team is always ready to assist you with any additional questions or requirements you may have.