High-temperature samarium cobalt magnet production

High-temperature rare earth

SmCo magnets.
Stable where NdFeB gives up.

Samarium cobalt (SmCo 1:5 and 2:17) holds flux up to 350°C. No coating needed for most environments. Specified for aerospace, military, traction motors, downhole tools and any application where temperature, corrosion or long service life are non-negotiable.

Request SmCo Quote Download Datasheet (PDF)

Why SmCo

Four reasons to specify SmCo.

01
Temperature stability

Stable magnetic output from −60°C to +350°C, with very low reversible temperature coefficient.
02
Corrosion resistance

No coating required for most applications — exceptional resistance to humidity and chemicals.
03
High Hcj ratings

Intrinsic coercivity up to 1600 kA/m — resists demagnetization under high load conditions.
04
Long service life

No oxidation, no plating failure, no risk of hydrogen embrittlement — ideal for safety-critical applications.

Product geometry

Geometry supplied in SmCo.

Standard forms produced in samarium cobalt for high-temperature and corrosion-resistant duty.

01
Discs

Round geometry for high-temperature duty
02
Blocks

Rectangular geometry, coating-free in most designs
03
Rings

Annular geometry for sensors and instruments
04
Arcs

Segment geometry for motor magnetic circuits

Technical reference

SmCo data, kept intact.

The tables below preserve the legacy empiremagnets.com product information and reference values. Use them for first-pass selection; final acceptance values remain project-specific.

Application & grade guidance

5 reference rows Technical datasheet

Application	Typical Spec	Why this material
High-temperature motors / actuators	SmCo 2:17 S24H–S30H	Stable flux and high coercivity at elevated temperature
Automotive sensors	S22H / S24H	Temperature stability and corrosion resistance
Downhole / harsh industrial	HTS series	High-temperature margin and chemical resistance
Microwave / instrumentation	SmCo 1:5	High coercivity and predictable magnetic behavior
Medical / precision equipment	SmCo 2:17	Stable output without relying on an external corrosion coating

SmCo 1:5 vs 2:17

3 reference rows Technical datasheet

Family	Energy / coercivity character	Temperature behavior	Processing note	Typical use
SmCo₅ (1:5)	Lower energy, high coercivity	Excellent	Fine/brittle; grinding only	Small parts, sensors, microwave devices
Sm₂Co₁₇ (2:17)	Higher energy product	Excellent to extreme-temperature classes	Grinding only; edge protection important	Motors, aerospace/industrial actuators, oil & gas
HTS 2:17	Application-specific high-temperature family	Up to ~350°C class where validated	Test condition must be defined	Downhole, high-temperature actuation

Complete technical grade data

51 reference rows Technical datasheet

Grade	Br mT (kGs)	Hcb kA/m (kOe)	Hcj kA/m (kOe)	(BH)max kJ/m³ (MGOe)	αBr %/°C	βHcj %/°C	PDF
S10H	580-710 (5.8-7.1)	≥422 (≥5.3)	≥1990 (≥25)	63-95 (8-12)	0.03	0.2	Datasheet
S12H	650-760 (6.5-7.6)	≥478 (≥6.0)	≥1990 (≥25)	79-111 (10-14)	0.03	0.2	Datasheet
S14H	710-830 (7.1-8.3)	≥525 (≥6.6)	≥1990 (≥25)	95-127 (12-16)	0.03	0.2	Datasheet
S16H	790-860 (7.9-8.6)	≥589 (≥7.4)	≥1990 (≥25)	119-143 (15-18)	0.03	0.2	Datasheet
S18H	830-890 (8.3-8.9)	≥605 (≥7.6)	≥1990 (≥25)	135-159 (17-20)	0.03	0.2	Datasheet
S20H	870-930 (8.7-9.3)	≥653 (≥8.2)	≥1990 (≥25)	151-175 (19-22)	0.03	0.2	Datasheet
S22H	910-980 (9.1-9.8)	≥693 (≥8.7)	≥1990 (≥25)	159-183 (20-23)	0.03	0.2	Download
S24H	960-1030 (9.6-10.3)	≥724 (≥9.1)	≥1990 (≥25)	175-199 (22-25)	0.03	0.2	Download
S26H	1010-1060 (10.1-10.6)	≥733 (≥9.2)	≥1990 (≥25)	191-215 (24-27)	0.03	0.2	Download
S28H	1040-1090 (10.4-10.9)	≥749 (≥9.4)	≥1990 (≥25)	207-231 (26-29)	0.03	0.2	Download
S30H	1080-1110 (10.8-11.1)	≥773 (≥9.7)	≥1990 (≥25)	222-247 (28-31)	0.035	0.2	Download
S32H	1120-1160 (11.2-11.6)	≥812 (≥10.2)	≥1990 (≥25)	239-263 (30-33)	0.038	0.2	Download
S34H	1150-1180 (11.5-11.8)	≥835 (≥10.5)	≥1990 (≥25)	247-270 (31-34)	0.04	0.25	Datasheet
S35H	1170-1200 (11.7-12.0)	≥860 (≥10.8)	≥1990 (≥25)	255-278 (32-35)	0.04	0.25	Datasheet
S10	580-710 (5.8-7.1)	≥422 (≥5.3)	≥1592 (≥20)	63-95 (8-12)	0.03	0.2	Datasheet
S12	650-760 (6.5-7.6)	≥478 (≥6.0)	≥1592 (≥20)	79-111 (10-14)	0.03	0.2	Datasheet
S14	710-830 (7.1-8.3)	≥525 (≥6.6)	≥1592 (≥20)	95-127 (12-16)	0.03	0.2	Datasheet
S16	790-860 (7.9-8.6)	≥589 (≥7.4)	≥1592 (≥20)	119-143 (15-18)	0.03	0.2	Datasheet
S18	830-890 (8.3-8.9)	≥605 (≥7.6)	≥1592 (≥20)	135-159 (17-20)	0.03	0.2	Datasheet
S20	870-930 (8.7-9.3)	≥653 (≥8.2)	≥1592 (≥20)	151-175 (19-22)	0.03	0.2	Datasheet
S22	910-980 (9.1-9.8)	≥693 (≥8.7)	≥1592 (≥20)	159-183 (20-23)	0.03	0.2	Datasheet
S24	960-1030 (9.6-10.3)	≥724 (≥9.1)	≥1592 (≥20)	175-199 (22-25)	0.03	0.2	Datasheet
S26	1010-1060 (10.1-10.6)	≥733 (≥9.2)	≥1592 (≥20)	191-215 (24-27)	0.03	0.2	Datasheet
S28	1040-1090 (10.4-10.9)	≥749 (≥9.4)	≥1592 (≥20)	207-231 (26-29)	0.03	0.2	Datasheet
S30	1080-1110 (10.8-11.1)	≥773 (≥9.7)	≥1592 (≥20)	222-247 (28-31)	0.035	0.2	Datasheet
S32	1100-1130 (11.0-11.3)	≥804 (≥10.1)	≥1592 (≥20)	231-255 (29-32)	0.038	0.2	Datasheet
S33	1120-1160 (11.2-11.6)	≥812 (≥10.2)	≥1592 (≥20)	239-263 (30-33)	0.038	0.2	Datasheet
S34	1150-1180 (11.5-11.8)	≥835 (≥10.5)	≥1592 (≥20)	247-270 (31-34)	0.04	0.25	Datasheet
S35	1170-1200 (11.7-12.0)	≥860 (≥10.8)	≥1592 (≥20)	255-278 (32-35)	0.04	0.25	Datasheet
S24M	960-1030 (9.6-10.3)	597-756 (7.5-9.5)	796-1273 (10-16)	175-199 (22-25)	0.03	0.2	Datasheet
S26M	1010-1060 (10.1-10.6)	597-820 (7.5-10.3)	796-1273 (10-16)	191-215 (24-27)	0.03	0.2	Download
S28M	1040-1090 (10.4-10.9)	621-836 (7.8-10.5)	796-1273 (10-16)	207-231 (26-29)	0.03	0.2	Download
S30M	1080-1110 (10.8-11.1)	621-836 (7.8-10.5)	796-1273 (10-16)	222-247 (28-31)	0.035	0.2	Download
S32M	1110-1150 (11.1-11.5)	717-844 (9.0-10.6)	796-1273 (10-16)	239-263 (30-33)	0.038	0.2	Download
S24L	960-1030 (9.6-10.3)	438-716 (5.5-9)	478-796 (6-10)	175-199 (22-25)	0.03	0.2	Datasheet
S26L	1010-1060 (10.1-10.6)	438-716 (5.5-9)	478-796 (6-10)	191-215 (24-27)	0.03	0.2	Datasheet
S28L	1040-1090 (10.4-10.9)	438-716 (5.5-9)	478-796 (6-10)	207-231 (26-29)	0.03	0.2	Datasheet
S30L	1080-1120 (10.8-11.2)	438-757 (5.5-9.5)	478-796 (6-10)	222-247 (28-31)	0.035	0.2	Datasheet
S32L	1110-1150 (11.1-11.5)	438-757 (5.5-9.5)	478-796 (6-10)	231-255 (29-32)	0.038	0.2	Datasheet
HTS20H	870-930 (8.7-9.3)	≥653 (≥8.2)	≥1990 (≥25)	151-175 (19-22)	0.05	0.2	Datasheet
HTS22H	910-980 (9.1-9.8)	≥693 (≥8.7)	≥1990 (≥25)	159-183 (20-23)	0.05	0.2	Download
HTS24H	960-1030 (9.6-10.3)	≥724 (≥9.1)	≥1990 (≥25)	175-199 (22-25)	0.05	0.2	Download
LTS14	730-800 (7.3-8.0)	≥565 (≥7.1)	≥1592 (≥20)	103-127 (13-16)	0.005–0.01	0.3	Datasheet
LTS16	790-860 (7.9-8.6)	≥613 (≥7.7)	≥1592 (≥20)	119-143 (15-18)	0.01–0.015	0.3	Datasheet
LTS18	830-890 (8.3-8.9)	≥645 (≥8.1)	≥1592 (≥20)	135-159 (17-20)	0.015–0.02	0.3	Datasheet
LTS20	870-930 (8.7-9.3)	≥653 (≥8.2)	≥1592 (≥20)	151-175 (19-22)	0.02–0.025	0.3	Datasheet
PS16H	790-860 (7.9-8.6)	≥605 (≥7.6)	≥1990 (≥25)	119-143 (15-18)	0.05	0.3	Datasheet
PS18H	840-910 (8.4-9.1)	≥645 (≥8.1)	≥1990 (≥25)	135-159 (17-20)	0.05	0.3	Datasheet
PS20H	870-930 (8.7-9.3)	≥653 (≥8.2)	≥1990 (≥25)	151-175 (19-22)	0.05	0.3	Datasheet
PS22H	910-980 (9.1-9.8)	≥693 (≥8.7)	≥1990 (≥25)	159-183 (20-23)	0.05	0.3	Datasheet
PS24H	950-1010 (9.5-10.1)	≥717 (≥9.0)	≥1990 (≥25)	175-199 (22-25)	0.05	0.3	Datasheet

Material characteristics

5 reference rows Technical datasheet

Characteristic	SmCo 1:5	SmCo 2:17
Typical use	Small / complex, high-coercivity parts	Higher-energy, high-temperature applications
Energy product	Lower to medium	Higher
Temperature coefficient	Excellent	Excellent / typically better
Coercivity	Very high	High to very high
Manufacturing note	Fine-grain / brittle	Brittle; grinding only

Geometry & tolerances

4 reference rows Technical datasheet

Process	Typical Tolerance	Notes
As-sintered	±0.1 mm	Non-critical faces
Ground	±0.05 mm	Standard mating dimensions
Precision ground	±0.02 mm	Locating / press-fit dimensions
Parallelism / perpendicularity	Per drawing	DFM confirmation

Grade datasheets

Download by grade.

Open the exact grade specification directly from this product page.

S22HPDF ↓ S24HPDF ↓ S26HPDF ↓ S26MPDF ↓ S28HPDF ↓ S28MPDF ↓ S30HPDF ↓ S30MPDF ↓ S32HPDF ↓ S32MPDF ↓ HTS22HPDF ↓ HTS24HPDF ↓

Reference values are reproduced from the legacy product pages. Confirm grade, test method, tolerance, coating, temperature class and inspection criteria against the released drawing and purchase specification.

Magnetic process evidence

Magnetic process evidence, matched to the part.

A visual record of magnetic material and assembly manufacturing, inspection and packing.

Manufacturing

01 Grade-specific proportioning Controlled material preparation
Manufacturing

02 Vacuum alloy melting Rare-earth alloy route
Manufacturing

03 Fine powder preparation Controlled powder route
Manufacturing

04 Scaled vacuum sintering hall High-temperature material processing
Inspection

05 Hysteresis and magnetic curve analysis Magnetic performance verification
Packing

06 Lot-controlled SmCo packing Batch identification and export packing

Specification guide

Choose SmCo with the application in view.

SmCo is the high-temperature and corrosion-resistant option when the application can accept higher material cost, lower mechanical toughness and tighter handling discipline.

A good fit when

The material earns its place.

Magnet temperatures beyond the practical range of standard NdFeB
Stable output in aerospace, vacuum, chemical or outdoor environments
Designs where coating-free performance is valuable
High coercivity requirements under elevated temperature or opposing fields

Check before release

Resolve these trade-offs early.

SmCo is brittle; impact, edge chipping and press-fit stress need a controlled assembly method
Material cost and rare-earth price exposure may outweigh the benefit in moderate-temperature designs
Magnetic performance still depends on grade, geometry, working point and temperature history
Do not assume 'no coating' means no environmental or handling specification

RFQ preparation

Give engineering the information that changes the answer.

A drawing alone may not define the magnetic requirement. These inputs help us recommend the right grade, geometry, coating and inspection plan instead of quoting a generic part.

Magnet temperature

Give the actual magnet body temperature, thermal gradient and duration. Separate continuous duty from short peak exposure.

Mechanical loads

Describe impact, vibration, clamping, adhesive cure and insertion loads. SmCo parts should not be treated like ductile steel components.

Magnetic stability

State the allowable flux change, opposing field and temperature coefficient target so 1:5 and 2:17 options can be compared fairly.

Handling and packaging

Specify edge protection, pole orientation, keep-away distances, magnetized or unmagnetized shipment and any air-freight constraints.

Acceptance planning

Define the evidence before the first production order.

Inspection scope should follow the failure mode. We can align the report format, sample quantity and release criteria during drawing review.

High-temperature exposure

Define the temperature cycle, dwell time, stabilization method and the magnetic property to be rechecked after exposure.

Mechanical integrity

Inspect chips, cracks, edge damage and fit condition using agreed visual and dimensional criteria before assembly.

Flux stability

Use a controlled fixture and consistent measurement position when verifying flux, field strength or matched sets.

Traceability

Tie grade, lot, heat treatment route, inspection results and packing identification to the same batch record.

Buyer questions

The short version before you send a drawing.

Why choose SmCo instead of NdFeB?

SmCo is typically considered when temperature capability, coercivity, corrosion resistance or long-term stability justify its higher cost and more brittle handling characteristics.

Does SmCo need a coating?

Many SmCo designs can be evaluated without a coating, but the final decision still depends on the environment, surface handling, cleanliness and assembly process.

Can SmCo be machined after magnetizing?

Machining strategy should be defined before production. Because SmCo is brittle and magnetic dust must be controlled, most precision processing and inspection planning is completed before final magnetization.

Start a project

Send the drawing. Tell us
what the magnet has to do.

Our engineering team can review material, operating conditions, magnetic requirements, manufacturing route and validation needs before quotation.

Start Engineering Review Download technical PDFs

RFQ channel rfq@china-empire.com

General service services@china-empire.com

Engineering review Drawings and requirements welcome

SmCo magnets.Stable where NdFeB gives up.

Temperature stability

Corrosion resistance

High Hcj ratings

Long service life

Discs

Blocks

Rings

Arcs