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Materials & specifications

Every grade.
Every spec.

Property data for the magnet families we manufacture. Pick a family below to see grade-by-grade values for residual induction, coercivity, energy product, and operating temperature.

Sintered NdFeB

Nd₂Fe₁₄B

Energy product

Up to 56 MGOe

Max temp range

60–220 °C

Curie temp

~310–370 °C

Density

~7.5 g/cm³

The highest energy density permanent magnets in commercial production. Selected when raw magnetic strength matters most: motors, sensors, hard drives, MRI components, and high-torque actuators.

Grades are organized by temperature class. The base grade (N35–N56) covers room-temperature applications. Suffix letters extend operating temperature: M to 100°C, H to 120°C, SH to 150°C, UH to 180°C, EH to 200°C, and AH to 220°C.

NdFeB is sensitive to corrosion and is typically supplied with a Ni-Cu-Ni, epoxy, or other protective coating. See the Coatings & Platings reference.

NdFeB family demagnetization curves overview

Full NdFeB materials table

Combined PDF with every grade, BH curves, and temperature coefficients in one document.

Download PDF

Filter by class:

Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C
N35	1.17–1.22	≥868	≥955	263–287	80
N38	1.22–1.26	≥899	≥955	287–310	80
N40	1.26–1.29	≥907	≥955	302–326	80
N42	1.29–1.33	≥915	≥955	318–342	80
N45	1.33–1.37	≥915	≥955	342–366	80
N48	1.37–1.40	≥876	≥955	358–390	80
N50	1.39–1.42	≥836	≥955	374–406	80
N52	1.42–1.45	≥836	≥955	382–414	80
N54	1.44–1.47	≥796	≥875	398–422	60
N56	1.46–1.50	≥796	≥875	406–438	60
N35M	1.17–1.22	≥868	≥1114	263–287	100
N38M	1.22–1.26	≥899	≥1114	287–310	100
N40M	1.26–1.29	≥923	≥1114	302–326	100
N42M	1.29–1.33	≥955	≥1114	318–342	100
N45M	1.33–1.37	≥995	≥1114	342–366	100
N48M	1.37–1.40	≥1035	≥1114	358–390	100
N50M	1.39–1.42	≥1035	≥1114	374–406	100
N52M	1.42–1.45	≥1035	≥1114	382–414	100
N54M	1.44–1.47	≥1035	≥1114	398–422	100
N35H	1.17–1.22	≥868	≥1353	263–287	120
N38H	1.22–1.26	≥899	≥1353	287–310	120
N40H	1.26–1.29	≥923	≥1353	302–326	120
N42H	1.29–1.33	≥955	≥1353	318–342	120
N45H	1.33–1.37	≥971	≥1353	342–366	120
N48H	1.37–1.40	≥995	≥1353	358–390	120
N50H	1.39–1.42	≥1035	≥1353	374–406	120
N52H	1.42–1.45	≥1035	≥1353	382–414	120
N54H	1.44–1.47	≥1035	≥1353	398–422	120
N35SH	1.17–1.22	≥876	≥1592	263–287	150
N38SH	1.22–1.26	≥907	≥1592	287–310	150
N40SH	1.26–1.29	≥939	≥1592	302–326	150
N42SH	1.29–1.33	≥955	≥1592	318–342	150
N45SH	1.33–1.37	≥995	≥1592	342–366	150
N48SH	1.37–1.40	≥995	≥1592	358–390	150
N50SH	1.39–1.42	≥1035	≥1592	374–406	150
N52SH	1.42–1.45	≥1035	≥1512	382–414	150
N54SH	1.44–1.47	≥1035	≥1592	398–422	150
N35UH	1.17–1.22	≥860	≥1990	263–287	180
N38UH	1.22–1.26	≥876	≥1990	287–310	180
N40UH	1.26–1.29	≥915	≥1990	302–326	180
N42UH	1.29–1.33	≥955	≥1990	318–342	180
N45UH	1.33–1.37	≥995	≥1990	342–366	180
N48UH	1.37–1.40	≥995	≥1910	358–390	180
N50UH	1.39–1.42	≥1035	≥1990	374–406	180
N52UH	1.42–1.45	≥1058	≥1990	382–414	180
N35EH	1.17–1.22	≥860	≥2388	263–287	200
N38EH	1.22–1.26	≥876	≥2388	287–310	200
N40EH	1.26–1.29	≥915	≥2388	302–326	200
N42EH	1.29–1.33	≥955	≥2388	318–342	200
N45EH	1.33–1.37	≥995	≥2308	342–366	200
N48EH	1.37–1.40	≥995	≥2388	358–390	200
N50EH	1.39–1.42	≥1035	≥2388	374–406	200
N35AH	1.17–1.22	≥860	≥2786	263–287	220
N38AH	1.22–1.26	≥876	≥2786	287–310	220
N40AH	1.26–1.29	≥915	≥2706	302–326	220
N42AH	1.29–1.33	≥955	≥2786	318–342	220

Sintered SmCo

SmCo₅ & Sm₂Co₁₇

Energy product

Up to ~33 MGOe

Max temp range

250–350 °C

Curie temp

~720–820 °C

Density

~8.4 g/cm³

The right answer when temperature, corrosion, or radiation rules out NdFeB. SmCo holds its magnetization at elevated temperatures and resists oxidation without coatings.

Common in aerospace, downhole oil & gas tools, military, and high-reliability sensor applications. Two main families: SmCo₅ (1:5) and Sm₂Co₁₇ (2:17), with the latter offering higher energy density and temperature stability.

SmCo is brittle and harder to machine than NdFeB. Designs typically account for chamfered edges and tighter handling specs.

SmCo family demagnetization curves overview

Full SmCo materials table

Combined PDF with every grade and the BH curves for both 1:5 and 2:17 families.

Download PDF

Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C	α(Br) %/°C
SmCo-20	0.89–0.93	684–732	≥1830	150–167	250	−0.045
SmCo-22	0.92–0.96	710–756	≥1830	167–183	250	−0.045
SmCo-24	0.96–1.00	740–788	≥1830	183–199	250	−0.045
SmCo-30L	1.08–1.15	541–796	636–955	220–240	250	−0.035
SmCo-32L	1.10–1.15	541–812	636–955	230–255	250	−0.035
SmCo-30M	1.08–1.10	676–835	955–1433	220–240	300	−0.035
SmCo-32M	1.10–1.13	676–852	955–1433	230–255	300	−0.035
SmCo-28	1.03–1.08	756–812	≥1433	207–220	300	−0.035
SmCo-30	1.08–1.10	788–835	≥1433	220–240	300	−0.035
SmCo-32	1.10–1.13	812–860	≥1433	230–255	300	−0.035
SmCo-28H	1.03–1.08	756–812	≥1990	207–220	350	−0.035
SmCo-30H	1.08–1.10	788–835	≥1990	220–240	350	−0.035
SmCo-32H	1.10–1.13	812–860	≥1990	230–255	350	−0.035
SmCo-33H	1.13–1.15	830–880	≥1990	246–262	350	−0.039
SmCo-35H	1.16–1.20	852–899	≥1990	255–271	300	−0.039

Sintered Ferrite

SrO·6Fe₂O₃

Energy product

Up to ~4.4 MGOe

Max temp

~250 °C

Curie temp

~450 °C

Density

~4.9 g/cm³

The most cost-effective permanent magnet on the market. Inherent corrosion resistance, mechanical hardness, and a long history of use across motors, speakers, holding magnets, and consumer products.

Lower energy density than rare-earth families, but the price-per-pound advantage is significant for high-volume programs that don't need maximum performance. Strontium-based grades dominate; barium-based variants exist but are less common today.

Sintered Ferrite family demagnetization curves overview

Sintered Ferrite materials table

Combined PDF with all ferrite grades and BH curves.

Download PDF

Grade	Br mT	Br kGs	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	(BH)max MGOe	T_max °C
XM10T	200–235	2.0–2.35	128–160	210–280	6.4–9.6	0.8–1.2	250
XM25	360–400	3.6–4.0	135–170	140–200	22.5–28.0	2.8–3.5	250
XM30	380–400	3.8–4.0	175–210	180–220	26.0–30.0	3.3–3.8	250
XM33	410–430	4.1–4.3	220–250	225–255	31.5–35.0	4.0–4.4	250
XM35	400–440	4.0–4.4	176–224	180–230	30.3–33.4	3.8–4.2	250
XM30BH	380–400	3.8–4.0	223–235	231–245	27.0–30.0	3.4–3.8	250
XM33H	410–430	4.1–4.3	250–270	250–275	31.5–35.0	4.0–4.4	250

Alnico

Al-Ni-Co-Fe

Energy product

Up to ~12 MGOe

Max temp

450–550 °C

Curie temp

~860 °C

Density

~7.3 g/cm³

The first commercial permanent magnet, and still unmatched for high-temperature stability. Alnico holds magnetization above 500°C, where rare-earth materials fall apart.

Common in instrumentation, sensor probes, guitar pickups, holding fixtures, and any application where temperature swing or thermal stability matters more than absolute strength.

Cast and sintered grades exist (the FLNG prefix denotes flexible/sintered variants). Alnico is mechanically robust and machinable but easily demagnetized by external fields, so circuit design matters.

Alnico family demagnetization curves overview

Alnico materials table

Combined PDF for cast (LNG/LNGT) and sintered (FLNG/FLNGT) Alnico families.

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Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C	α(Br) %/°C
LN10	0.65	38	40	10	450	−0.035
LNG12	0.75	45	46	12	450	−0.030
LNGT18	0.55	90	97	18	550	−0.025
LNG34	1.10	50	52	34	525	−0.020
LNG37	1.18	49	51	37	525	−0.020
LNG40	1.20	50	52	40	525	−0.020
LNG44	1.25	52	54	44	525	−0.020
LNGT28	1.05	56	58	28	525	−0.020
LNG52	1.30	56	58	52	525	−0.020
LNG60	1.35	58	60	60	525	−0.020
LNGT34	0.80	104	106	34	550	−0.025
LNGT38	0.80	110	112	38	550	−0.025
LNGT40	0.85	115	117	40	550	−0.025
LNGT44	0.90	115	117	44	550	−0.025
LNGT36J	0.72	150	144	36	550	−0.025
LNGT40J	0.75	144	159	40	550	−0.025
LNGT60	1.00	110	112	60	550	−0.025
LNGT72	1.05	115	117	72	550	−0.025
LNGT80	1.08	120	122	80	550	−0.025
LNGT96	1.10	128	122	96	550	−0.025
FLNG10	0.65	40	42	10	450	−0.035
FLNG12	0.75	45	46	12	450	−0.035
FLNGT18	0.60	95	98	18	550	−0.025
FLNGT20	0.62	100	105	20	550	−0.025
FLNG34	1.10	50	52	34	525	−0.020
FLNG37	1.18	49	51	37	525	−0.020
FLNGT28	1.05	56	58	28	525	−0.020
FLNGT36J	0.72	150	144	36	550	−0.025
FLNGT38	0.80	104	106	38	550	−0.025
FLNGT40J	0.75	144	159	40	550	−0.025
FLNGT44	0.90	115	117	44	550	−0.025
FLNGT48	0.92	115	117	48	550	−0.025

Bonded Magnets

Powder + polymer binder

Forms

Compression & injection

Max temp

100–160 °C

Geometry

Net or near-net shape

Powder base

NdFeB or ferrite

Magnet powder mixed with a polymer binder, then compression- or injection-molded to net shape. Lower performance per volume than fully sintered magnets, but enables intricate geometries, multi-pole magnetization patterns, and integration with plastic components in a single shot.

Compression molding uses an epoxy binder for higher loading and better magnetic performance. Injection molding uses thermoplastics (PA, PPS) for better mechanical properties and complex shapes including overmolding.

Bonded magnets materials table

Combined PDF covering compression and injection molded NdFeB and ferrite grades.

Download PDF

Compression Molded NdFeB

Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C
KBM-2	0.30–0.40	160–240	480–640	16–24	≤120
KBM-4	0.40–0.50	240–320	560–720	32–44	≤120
KBM-6	0.50–0.60	320–400	480–640	48–60	≤120
KBM-8	0.60–0.68	360–440	640–800	64–72	≤150
KBM-8H	0.60–0.65	400–480	1120–1280	60–68	≤160
KBM-8L	0.65–0.68	400–480	900–1120	64–72	≤160
KBM-9	0.60–0.68	400–480	640–800	68–72	≤150
KBM-10	0.68–0.73	400–480	640–800	76–84	≤150
KBM-12	0.71–0.75	440–520	720–800	84–96	≤150
KBM-12L	0.72–0.76	400–480	480–640	84–96	≤140

Injection Molded NdFeB

Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C
KBI-3	0.20–0.30	160–240	480–640	12–24	≤100
KBI-4	0.35–0.45	240–320	560–720	24–36	≤120
KBI-5	0.45–0.52	320–360	560–720	36–44	≤120
KBI-5H (PPS)	0.48–0.52	400–480	880–1040	36–44	≤150
KBI-6	0.50–0.55	320–440	640–800	44–52	≤120
KBI-7	0.54–0.64	320–400	640–800	52–60	≤120
KBI-8	0.64–0.74	400–480	640–800	68–76	≤120

Injection Molded Ferrite

Grade	Br T	HcB kA/m	HcJ kA/m	(BH)max kJ/m³	T_max °C
KBI-F1.5	0.22–0.24	160–167	231–240	11.6–12.4	≤120
KBI-F1.9	0.27–0.29	180–186	216–228	14.8–15.6	≤120
KBI-F2.0	0.28–0.29	184–200	216–246	15.6–16.4	≤120
KBI-F2.1	0.28–0.29	190–204	224–249	16.4–17.2	≤120
KBI-F1.7 (PPS)	0.25–0.26	167–175	208–216	13.6–14.0	≤160

FeCrCo

Fe-Cr-Co

Energy product

Up to ~7 MGOe

Max temp

~400 °C

Curie temp

~680 °C

Density

~7.6 g/cm³

An iron-chromium-cobalt alloy with a property profile similar to Alnico, but mechanically ductile and machinable in the soft state. Hardened after machining to lock in magnetic properties.

Used where geometric complexity, machining, or thread-cutting on a magnet body is required. Common in hysteresis motors, sensors, and relay components.

FeCrCo materials table

Combined PDF with all FeCrCo grades, BH curves, and machining notes.

Download PDF

Selection guide

When to use what.

A quick orientation for picking a family. The right answer depends on operating temperature, environment, geometry, and budget.

Maximum strength

Sintered NdFeB

Highest energy density of any commercial magnet. Default for motors, sensors, and high-torque applications below 220°C.

High temperature, harsh environments

Sintered SmCo

Holds magnetization to 350°C, resists corrosion without coatings, and tolerates radiation. The aerospace and downhole choice.

Cost-driven, high volume

Sintered Ferrite

Inexpensive, corrosion-resistant, mechanically hard. Ideal for speakers, holding magnets, and large motor programs.

Extreme temperature stability

Alnico

Operates above 500°C with the lowest temperature coefficient of any family. Sensors, instruments, guitar pickups.

Net-shape geometry

Bonded Magnets

Compression or injection molded directly to shape. Multi-pole magnetization, overmolding, and intricate features in one part.

Machinable / threaded

FeCrCo

Machine in the soft state, then heat treat. The right answer when the magnet itself needs to be drilled, threaded, or precision-finished.

Need a custom grade?

If a standard grade doesn't fit, we'll work with you on a tailored composition or magnetization pattern. Send your operating conditions and we'll come back with options.

Talk to an engineer

Every grade.Every spec.

Sintered NdFeB

Full NdFeB materials table

Sintered SmCo

Full SmCo materials table

Sintered Ferrite

Sintered Ferrite materials table

Alnico

Alnico materials table

Bonded Magnets

Bonded magnets materials table

Compression Molded NdFeB

Injection Molded NdFeB

Injection Molded Ferrite

FeCrCo

FeCrCo materials table

Sintered NdFeB

Sintered SmCo

Sintered Ferrite

Alnico

Bonded Magnets

FeCrCo

Need a custom grade?

Every grade.
Every spec.