Radially Oriented NdFeB Ring Magnets

Anisotropic Bonded NdFeB
Magnetic & Physical Properties

Hot Pressed Radial NdFeB
Magnetic & Physical Properties

Sintered Radial NdFeB
Magnetic & Physical Properties

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Radially Oriented NdFeB Magnets are some of the newest materials in the magnetics industry. The technology for producing rare earth ring magnets with radial magnetic fields has been around for decades, however only in recent years has the cost of manufacturing them come to a point where the magnets are an affordable replacement to traditional multi segmented arcs. There are three main manufacturing methods for producing bonded and sintered radial oriented rings:

Anisotropic Pressure Molding

Hot Pressing & Backward Extrusion

Radial Rotating Field Alignment

Each of these methods produces magnets with certain advantages and disadvantages over the others. Please click on the above links to view presentations on each material in order to determine what is best for your particular application.

Radial Bonded Magnetic Properties	Remanent Induction		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product		Reversible Temperature Coefficients		Continuous Working Temp.
	Br (Gauss)		Hc (Oe)		Hci (Oe)		(BH)max (MGOe)		α Br	ß Hci	Tw (°C)
	Min	Max	Min	Max	Min	Max	Min	Max	%/°C	%/°C	Max
RB213	7,000	8,000	6,000	7,000	14,000	17,000	13.0	14.0	-0.11	-0.48	80
RB214	7,500	8,500	6,500	8,000	14,000	17,000	14.0	15.0	-0.11	-0.48	80
RB216	8,000	9,000	7,000	8,000	14,000	18,000	15.0	17.0	-0.11	-0.48	80
RB215	8,500	10,000	5,000	7,000	13,000	15,000	18.0	21.0	-0.11	-0.55	80
Radial Bonded Physical Properties	Minimum Density		Compressive Strength		Young's Modulus		Thermal Expansion Coefficient /°C		Electrical Resistivity		Curie Temp
Radial Bonded Physical Properties	g/cm3	lbs/in3	psi	MPa	psi	MPa	ǁ to M	Ʇ to M	Ω-cm @ 20 C		°C
RB213	5.9	0.213	4,200	29	4×10⁶	28,000	8.2×10^-6	4.3×10^-6	0.025		290
RB214	5.9	0.213	4,200	29	4×10⁶	28,000	8.2×10^-6	4.3×10^-6	0.025		290
RB216	5.9	0.213	4,200	29	4×10⁶	28,000	8.2×10^-6	4.3×10^-6	0.025		290
RB215	5.9	0.213	4,200	29	4×10⁶	28,000	8.2×10^-6	4.3×10^-6	0.025		290


Hot Pressed Magnetic Properties	Remanent Induction		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product		Reversible Temperature Coefficients		Continuous Working Temp.
	Br (Gauss)		Hc (Oe)		Hci (Oe)		(BH)max (MGOe)		α Br	ß Hci	Tw (°C)
	Min	Max	Min	Max	Min	Max	Min	Max	%/°C	%/°C	Max
HP34	12,200	12,600	11,300	12,300	13,000	16,000	38.0	43.0	-0.10	-0.50	80
HP50	14,400	14,500	13,100	13,900	14,000	18,000	47.0	51.0	-0.10	-0.50	80
HP42M	12,900	13,200	11,800	13,000	16,000	19,000	38.0	43.0	-0.10	-0.50	100
HP45M	13,300	13,700	12,000	13,100	16,000	19,000	40.0	46.0	-0.10	-0.50	100
HP40H	12,600	12,900	11,700	12,700	18,000	21,000	36.0	40.0	-0.10	-0.50	120
HP42H	12,900	13,200	12,200	13,100	18,000	21,000	36.0	41.0	-0.10	-0.50	120
HP45H	13,200	13,500	12,500	13,100	18,000	21,000	40.0	43.0	-0.10	-0.50	120
HP48H	13,500	14,000	13,100	13,600	18,000	21,000	43.0	46.0	-0.10	-0.50	120
HP35S	11,800	12,300	11,200	12,100	20,000	23,000	31.0	36.0	-0.10	-0.50	150
HP38S	12,200	12,600	11,600	12,400	20,000	23,000	35.0	39.0	-0.10	-0.50	150
HP40S	12,600	12,900	11,800	12,700	20,000	23,000	36.0	40.0	-0.10	-0.50	150
HP42S	12,900	13,200	12,200	13,100	20,000	23,000	38.0	41.0	-0.10	-0.50	150
HP45S	13,200	13,500	12,500	13,100	20,000	23,000	41.0	44.0	-0.10	-0.50	150
HP35U	11,800	12,300	11,200	12,100	25,000	28,000	31.0	36.0	-0.10	-0.50	180
HP38U	12,200	12,600	11,400	12,400	25,000	28,000	35.0	40.0	-0.10	-0.50	180
Hot Pressed Physical Properties	Minimum Density		Compressive Strength		Young's Modulus		Thermal Expansion Coefficient /°C		Electrical Resistivity		Curie Temp
Hot Pressed Physical Properties	g/cm3	lbs/in3	psi	MPa	psi	MPa	ǁ to M	Ʇ to M	Ω-cm @ 20 C		°C
HP34	7.6	0.275	21,750	150	22×10⁶	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP50	7.6	0.275	21,750	150	22×10⁶	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP42M	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP45M	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP40H	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP42H	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP45H	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP48H	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP35S	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP38S	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP40S	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP42S	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP45S	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		350
HP35U	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		360
HP38U	7.6	0.275	21,750	150	22×106	152,000	1.2×10^-6	-1×10^-6	0.000135		360


Radial NdFeB Magnetic Properties	Remanent Induction		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product		Reversible Temperature Coefficients		Continuous Working Temp.
	Br (Gauss)		Hc (Oe)		Hci (Oe)		(BH)max (MGOe)		α Br	ß Hci	Tw (°C)
	Min	Max	Min	Max	Min	Max	Min	Max	%/°C	%/°C	Max
RN35	11,800	12,600	9,500	11,500	12,000	14,000	31.0	37.0	-0.12	-0.60	80
RN38	12,000	12,800	9,600	11,600	12,000	14,000	32.0	40.0	-0.12	-0.60	80
RN42	12,200	13,000	9,700	11,700	12,000	14,000	324.0	42.0	-0.12	-0.60	80
RN35M	11,800	12,600	9,500	11,500	13,000	15,000	31.0	37.0	-0.12	-0.60	100
RN38M	12,000	12,800	9,600	11,600	13,000	15,000	32.0	40.0	-0.12	-0.60	100
RN42M	12,200	13,000	9,700	11,700	13,000	15,000	34.0	42.0	-0.12	-0.60	100
RN35H	11,800	12,600	9,600	11,600	14,000	16,000	31.0	37.0	-0.12	-0.60	120
RN38H	12,000	12,800	9,700	11,700	14,000	16,000	32.0	40.0	-0.12	-0.60	120
RN40H	12,100	12,900	9,700	11,700	14,000	16,000	33.0	41.0	-0.12	-0.60	120
RN42H	12,200	13,000	9,800	11,800	14,000	16,000	34.0	42.0	-0.12	-0.60	120
RN45H	12,500	13,500	9,900	11,900	14,000	16,000	36.0	45.0	-0.12	-0.60	120
RN35SH	11,800	12,600	9,700	11,700	16,000	18,000	31.0	37.0	-0.12	-0.60	150
RN38SH	12,000	12,800	9,800	11,800	16,000	18,000	32.0	40.0	-0.12	-0.60	150
RN40SH	12,100	12,900	9,800	11,800	16,000	18,000	33.0	41.0	-0.12	-0.60	150
RN42SH	12,200	13,000	10,000	12,000	16,000	18,000	34.0	42.0	-0.12	-0.60	150
RN35UH	11,800	12,600	9,800	11,800	19,000	21,000	31.0	37.0	-0.12	-0.60	180
RN38UH	12,000	12,800	10,000	12,000	19,000	21,000	32.0	40.0	-0.12	-0.60	180
Radial NdFeB Physical Properties	Minimum Density		Compressive Strength		Bending Strength		Thermal Expansion Coefficient /°C		Electrical Resistivity		Curie Temp
Radial NdFeB Physical Properties	g/cm3	lbs/in3	psi	MPa	psi	MPa	ǁ to M	Ʇ to M	Ω-cm @ 20 C		°C
RN35	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN38	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN42	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN35M	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN38M	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN42M	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN35H	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN38H	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN40H	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN42H	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN45H	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN35SH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN38SH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN40SH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN42SH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		310
RN35UH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		320
RN38UH	7.4	0.268	113,130	780	42,060	290	3.4×10^-6	-4.8×10^-6	0.000150		320