Temperature profile
Share continuous, peak and dwell temperatures at the magnet.
SmCo Magnets
Rare-earth magnets for demanding thermal conditions. Review the temperature profile, magnetic circuit and mechanical support together.
Application review notes
When temperature and magnetic stability drive the specification, SmCo deserves careful consideration. We connect material selection with thermal exposure, demagnetizing conditions, mechanical support and the inspection evidence your application requires.
START WITH YOUR REQUIREMENTS
Magnetic circuit
Define the geometry, working point and opposing fields.
Mechanical support
Identify critical edges, retention and inspection criteria.
FORMS & CONFIGURATIONS
SmCo Geometry and Edge Detail.
Representative product forms. Final geometry, dimensions and material are confirmed against your drawing.
Blocks
Rectangular geometry, coating-free in most designs
Review This Form
Rings
Annular geometry for sensors and instruments
Review This FormShape Selection
Blocks, rings, discs and arc segments for different magnetic circuits.
View Configuration GuideDESIGN & SELECTION
Define Stability in the Application.
- Thermal stability
Working point, temperature range and reverse fields
- Precision faces
Ground surfaces, fits and edge allowance
- Material system
Confirm 1:5 or 2:17 with the approved grade data
A good fit when
- 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
- 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
ENGINEERING REVIEW
Define the Thermal Duty.
Compare thermal stability and opposing fields, then check the loads applied to this brittle material.
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.
MATERIAL REFERENCE
Technical Data, Clearly Presented.
Complete technical grade data51 reference rows
51 rows
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Units and Notes
Notation: Br is remanent flux density; HcB (Hcb/bHc) is normal coercivity; HcJ (Hcj/Hci/iHc) is intrinsic coercivity. Grade identifiers retain their source naming. Historical aliases do not establish identical supply specifications.
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| Grade | Br mT (kG) | Hcb kA/m (kOe) | Hcj kA/m (kOe) | (BH)max kJ/m³ (MGOe) | |
|---|---|---|---|---|---|
| S10H | 580-710 (5.8-7.1) | ≥422 (≥5.3) | ≥1990 (≥25) | 63-95 (8-12) | Material Datasheet |
| S12H | 650-760 (6.5-7.6) | ≥478 (≥6.0) | ≥1990 (≥25) | 79-111 (10-14) | Material Datasheet |
| S14H | 710-830 (7.1-8.3) | ≥525 (≥6.6) | ≥1990 (≥25) | 95-127 (12-16) | Material Datasheet |
| S16H | 790-860 (7.9-8.6) | ≥589 (≥7.4) | ≥1990 (≥25) | 119-143 (15-18) | Material Datasheet |
| S18H | 830-890 (8.3-8.9) | ≥605 (≥7.6) | ≥1990 (≥25) | 135-159 (17-20) | Material Datasheet |
| S20H | 870-930 (8.7-9.3) | ≥653 (≥8.2) | ≥1990 (≥25) | 151-175 (19-22) | Material Datasheet |
| S22H | 910-980 (9.1-9.8) | ≥693 (≥8.7) | ≥1990 (≥25) | 159-183 (20-23) | Grade PDF |
| S24H | 960-1030 (9.6-10.3) | ≥724 (≥9.1) | ≥1990 (≥25) | 175-199 (22-25) | Grade PDF |
| S26H | 1010-1060 (10.1-10.6) | ≥733 (≥9.2) | ≥1990 (≥25) | 191-215 (24-27) | Grade PDF |
| S28H | 1040-1090 (10.4-10.9) | ≥749 (≥9.4) | ≥1990 (≥25) | 207-231 (26-29) | Grade PDF |
| S30H | 1080-1110 (10.8-11.1) | ≥773 (≥9.7) | ≥1990 (≥25) | 222-247 (28-31) | Grade PDF |
| S32H | 1120-1160 (11.2-11.6) | ≥812 (≥10.2) | ≥1990 (≥25) | 239-263 (30-33) | Grade PDF |
| S34H | 1150-1180 (11.5-11.8) | ≥835 (≥10.5) | ≥1990 (≥25) | 247-270 (31-34) | Material Datasheet |
| S35H | 1170-1200 (11.7-12.0) | ≥860 (≥10.8) | ≥1990 (≥25) | 255-278 (32-35) | Material Datasheet |
| S10 | 580-710 (5.8-7.1) | ≥422 (≥5.3) | ≥1592 (≥20) | 63-95 (8-12) | Material Datasheet |
| S12 | 650-760 (6.5-7.6) | ≥478 (≥6.0) | ≥1592 (≥20) | 79-111 (10-14) | Material Datasheet |
| S14 | 710-830 (7.1-8.3) | ≥525 (≥6.6) | ≥1592 (≥20) | 95-127 (12-16) | Material Datasheet |
| S16 | 790-860 (7.9-8.6) | ≥589 (≥7.4) | ≥1592 (≥20) | 119-143 (15-18) | Material Datasheet |
| S18 | 830-890 (8.3-8.9) | ≥605 (≥7.6) | ≥1592 (≥20) | 135-159 (17-20) | Material Datasheet |
| S20 | 870-930 (8.7-9.3) | ≥653 (≥8.2) | ≥1592 (≥20) | 151-175 (19-22) | Material Datasheet |
| S22 | 910-980 (9.1-9.8) | ≥693 (≥8.7) | ≥1592 (≥20) | 159-183 (20-23) | Material Datasheet |
| S24 | 960-1030 (9.6-10.3) | ≥724 (≥9.1) | ≥1592 (≥20) | 175-199 (22-25) | Material Datasheet |
| S26 | 1010-1060 (10.1-10.6) | ≥733 (≥9.2) | ≥1592 (≥20) | 191-215 (24-27) | Material Datasheet |
| S28 | 1040-1090 (10.4-10.9) | ≥749 (≥9.4) | ≥1592 (≥20) | 207-231 (26-29) | Material Datasheet |
| S30 | 1080-1110 (10.8-11.1) | ≥773 (≥9.7) | ≥1592 (≥20) | 222-247 (28-31) | Material Datasheet |
| S32 | 1100-1130 (11.0-11.3) | ≥804 (≥10.1) | ≥1592 (≥20) | 231-255 (29-32) | Material Datasheet |
| S33 | 1120-1160 (11.2-11.6) | ≥812 (≥10.2) | ≥1592 (≥20) | 239-263 (30-33) | Material Datasheet |
| S34 | 1150-1180 (11.5-11.8) | ≥835 (≥10.5) | ≥1592 (≥20) | 247-270 (31-34) | Material Datasheet |
| S35 | 1170-1200 (11.7-12.0) | ≥860 (≥10.8) | ≥1592 (≥20) | 255-278 (32-35) | Material Datasheet |
| S24M | 960-1030 (9.6-10.3) | 597-756 (7.5-9.5) | 796-1273 (10-16) | 175-199 (22-25) | Material Datasheet |
| S26M | 1010-1060 (10.1-10.6) | 597-820 (7.5-10.3) | 796-1273 (10-16) | 191-215 (24-27) | Grade PDF |
| S28M | 1040-1090 (10.4-10.9) | 621-836 (7.8-10.5) | 796-1273 (10-16) | 207-231 (26-29) | Grade PDF |
| S30M | 1080-1110 (10.8-11.1) | 621-836 (7.8-10.5) | 796-1273 (10-16) | 222-247 (28-31) | Grade PDF |
| S32M | 1110-1150 (11.1-11.5) | 717-844 (9.0-10.6) | 796-1273 (10-16) | 239-263 (30-33) | Grade PDF |
| S24L | 960-1030 (9.6-10.3) | 438-716 (5.5-9) | 478-796 (6-10) | 175-199 (22-25) | Material Datasheet |
| S26L | 1010-1060 (10.1-10.6) | 438-716 (5.5-9) | 478-796 (6-10) | 191-215 (24-27) | Material Datasheet |
| S28L | 1040-1090 (10.4-10.9) | 438-716 (5.5-9) | 478-796 (6-10) | 207-231 (26-29) | Material Datasheet |
| S30L | 1080-1120 (10.8-11.2) | 438-757 (5.5-9.5) | 478-796 (6-10) | 222-247 (28-31) | Material Datasheet |
| S32L | 1110-1150 (11.1-11.5) | 438-757 (5.5-9.5) | 478-796 (6-10) | 231-255 (29-32) | Material Datasheet |
| HTS20H | 870-930 (8.7-9.3) | ≥653 (≥8.2) | ≥1990 (≥25) | 151-175 (19-22) | Material Datasheet |
| HTS22H | 910-980 (9.1-9.8) | ≥693 (≥8.7) | ≥1990 (≥25) | 159-183 (20-23) | Grade PDF |
| HTS24H | 960-1030 (9.6-10.3) | ≥724 (≥9.1) | ≥1990 (≥25) | 175-199 (22-25) | Grade PDF |
| LTS14 | 730-800 (7.3-8.0) | ≥565 (≥7.1) | ≥1592 (≥20) | 103-127 (13-16) | Material Datasheet |
| LTS16 | 790-860 (7.9-8.6) | ≥613 (≥7.7) | ≥1592 (≥20) | 119-143 (15-18) | Material Datasheet |
| LTS18 | 830-890 (8.3-8.9) | ≥645 (≥8.1) | ≥1592 (≥20) | 135-159 (17-20) | Material Datasheet |
| LTS20 | 870-930 (8.7-9.3) | ≥653 (≥8.2) | ≥1592 (≥20) | 151-175 (19-22) | Material Datasheet |
| PS16H | 790-860 (7.9-8.6) | ≥605 (≥7.6) | ≥1990 (≥25) | 119-143 (15-18) | Material Datasheet |
| PS18H | 840-910 (8.4-9.1) | ≥645 (≥8.1) | ≥1990 (≥25) | 135-159 (17-20) | Material Datasheet |
| PS20H | 870-930 (8.7-9.3) | ≥653 (≥8.2) | ≥1990 (≥25) | 151-175 (19-22) | Material Datasheet |
| PS22H | 910-980 (9.1-9.8) | ≥693 (≥8.7) | ≥1990 (≥25) | 159-183 (20-23) | Material Datasheet |
| PS24H | 950-1010 (9.5-10.1) | ≥717 (≥9.0) | ≥1990 (≥25) | 175-199 (22-25) | Material Datasheet |
Reference values support initial selection; the approved drawing and agreed specification govern supply.
Grade PDF links open a dedicated grade file. Material Datasheet links open the general material reference. Series filters follow the source grade names; confirm the 1:5 or 2:17 system against the approved material specification.
Reference edition 2026.09-R1 · Magnetic quantities and conversion tools
Application & grade guidance5 reference rows
5 rows
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| Application | Typical Spec | Why this material |
|---|---|---|
| High-temperature motors / actuators | S24H–S30H; confirm material family | 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 2:173 reference rows
3 rows
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| 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 | Confirm grade and thermal exposure | Test condition must be defined | Downhole, high-temperature actuation |
Material characteristics5 reference rows
5 rows
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| 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 & tolerances4 reference rows
4 rows
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| Process | Typical Tolerance | Notes |
|---|---|---|
| As-sintered | Per agreed drawing | Non-critical faces |
| Ground | Per agreed drawing | Standard mating dimensions |
| Precision ground | Per agreed drawing | Locating / press-fit dimensions |
| Parallelism / perpendicularity | Per drawing | DFM confirmation |
QUALITY & RELEASE
Set Thermal and Mechanical Criteria.
Verification follows the component’s function and the agreed inspection plan.
High-temperature exposure
Review details
Define the temperature cycle, dwell time, stabilization method and the magnetic property to be rechecked after exposure.
Mechanical integrity
Review details
Inspect chips, cracks, edge damage and fit condition using agreed visual and dimensional criteria before assembly.
Flux stability
Review details
Use a controlled fixture and consistent measurement position when verifying flux, field strength or matched sets.
Traceability
Review details
Tie grade, lot, heat treatment route, inspection results and packing identification to the same batch record.
PRODUCT QUESTIONS
SmCo Temperature and Handling.
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.
CONTINUE EXPLORING
Related Magnetic Solutions.
APPLICATION REVIEW
Define Your SmCo Duty Cycle.
Share the temperature range, opposing field and mechanical loads.
Discuss This Specification