Samarium Cobalt Magnet Overview and Specs:
Samarium Cobalt (SmCo) magnet is also called rare earth Cobalt magnet. Its high resistance to demagnetization and excellent temperature stability makes SmCo high temperature magnet or Sm2Co17 magnet to work stable under temperature high to 350°C. Usually no coating is necessary. Therefore SmCo magnet is a premium choice of magnet material for many high performance applications like aerospace, motorsports and automotive industries.
| Grade | Residual Induction Br |
Coercivity Hcb |
Intrinsic Coercivity Hcj |
Maximum Energy Product (BH)max |
Rev. Temp. Coef. α(Br) |
Rev. Temp. Coef. β(Hcj) |
Max Working Temp. | ||||
| T | kG | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | %/°C | %/°C | °C | |
| SmCo5, (SmPr)Co5, SmCo 1:5 magnets | |||||||||||
| YX14 | 0.74-0.80 | 7.4-8.0 | 573-629 | 7.2-7.9 | >1194 | >15 | 96-119 | 12-15 | -0.04 | -0.30 | 250 |
| YX14H | 0.74-0.80 | 7.4-8.0 | 573-629 | 7.2-7.9 | >1592 | >20 | 96-119 | 12-15 | -0.04 | -0.30 | 250 |
| YX16 | 0.79-0.85 | 7.9-8.5 | 612-660 | 7.7-8.3 | >1194 | >15 | 110-135 | 14-17 | -0.04 | -0.30 | 250 |
| YX16H | 0.79-0.85 | 7.9-8.5 | 612-660 | 7.7-8.3 | >1592 | >20 | 110-135 | 14-17 | -0.04 | -0.30 | 250 |
| YX18 | 0.84-0.90 | 8.4-9.0 | 644-700 | 8.1-8.8 | >1194 | >15 | 127-151 | 16-19 | -0.04 | -0.30 | 250 |
| YX18H | 0.84-0.90 | 8.4-9.0 | 644-700 | 8.1-8.8 | >1592 | >20 | 127-151 | 16-19 | -0.04 | -0.30 | 250 |
| YX20 | 0.89-0.94 | 8.9-9.4 | 676-725 | 8.5-9.1 | >1194 | >15 | 143-167 | 18-21 | -0.04 | -0.30 | 250 |
| YX20H | 0.89-0.94 | 8.9-9.4 | 676-725 | 8.5-9.1 | >1592 | >20 | 143-167 | 18-21 | -0.04 | -0.30 | 250 |
| YX22 | 0.92-0.96 | 9.2-9.6 | 710-748 | 8.9-9.4 | >1194 | >15 | 160-183 | 20-23 | -0.04 | -0.30 | 250 |
| YX22H | 0.92-0.96 | 9.2-9.6 | 710-748 | 8.9-9.4 | >1592 | >20 | 160-183 | 20-23 | -0.04 | -0.30 | 250 |
| YX24 | 0.95-1.00 | 9.5-10.0 | 730-780 | 9.2-9.8 | >1194 | >15 | 175-199 | 22-25 | -0.04 | -0.30 | 250 |
| YX24H | 0.95-1.00 | 9.5-10.0 | 730-780 | 9.2-9.8 | >1592 | >20 | 175-199 | 22-25 | -0.04 | -0.30 | 250 |
| Sm2Co17, Sm2(CoFeCuZr)17, SmCo 2:17 magnets | |||||||||||
| YXG22 | 0.93-0.97 | 9.3-9.7 | 676-740 | 8.5-9.3 | >1433 | >18 | 160-183 | 20-23 | -0.03 | -0.20 | 350 |
| YXG22H | 0.93-0.97 | 9.3-9.7 | 676-740 | 8.5-9.3 | >1990 | >25 | 160-183 | 20-23 | -0.03 | -0.20 | 350 |
| YXG24 | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | >1433 | >18 | 175-191 | 22-24 | -0.03 | -0.20 | 350 |
| YXG24H | 0.95-1.02 | 9.5-10.2 | 692-764 | 8.7-9.6 | >1990 | >25 | 175-191 | 22-24 | -0.03 | -0.20 | 350 |
| YXG26M | 1.02-1.05 | 10.2-10.5 | 541-780 | 6.8-9.8 | 636-1433 | 8-18 | 191-207 | 24-26 | -0.03 | -0.20 | 300 |
| YXG26 | 1.02-1.05 | 10.2-10.5 | 748-796 | 9.4-10.0 | >1433 | >18 | 191-207 | 24-26 | -0.03 | -0.20 | 350 |
| YXG26H | 1.02-1.05 | 10.2-10.5 | 748-796 | 9.4-10.0 | >1990 | >25 | 191-207 | 24-26 | -0.03 | -0.20 | 350 |
| YXG28M | 1.03-1.08 | 10.3-10.8 | 541-796 | 6.8-10.0 | 636-1433 | 8-18 | 207-223 | 26-28 | -0.03 | -0.20 | 300 |
| YXG28 | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | >1433 | >18 | 207-223 | 26-28 | -0.03 | -0.20 | 350 |
| YXG28H | 1.03-1.08 | 10.3-10.8 | 756-812 | 9.5-10.2 | >1990 | >25 | 207-223 | 26-28 | -0.03 | -0.20 | 350 |
| YXG30M | 1.08-1.10 | 10.8-11.0 | 541-835 | 6.8-10.5 | 636-1433 | 8-18 | 223-240 | 28-30 | -0.03 | -0.20 | 300 |
| YXG30 | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | >1433 | >18 | 223-240 | 28-30 | -0.03 | -0.20 | 350 |
| YXG30H | 1.08-1.10 | 10.8-11.0 | 788-835 | 9.9-10.5 | >1990 | >25 | 223-240 | 28-30 | -0.03 | -0.20 | 350 |
| YXG32M | 1.10-1.13 | 11.0-11.3 | 541-844 | 6.8-10.6 | 636-1433 | 8-18 | 230-255 | 29-32 | -0.03 | -0.20 | 300 |
| YXG32 | 1.10-1.13 | 11.0-11.3 | 812-844 | 10.2-10.6 | >1433 | >18 | 230-255 | 29-32 | -0.03 | -0.20 | 350 |
| YXG32H | 1.10-1.13 | 11.0-11.3 | 812-844 | 10.2-10.6 | >1990 | >25 | 230-255 | 29-32 | -0.03 | -0.20 | 350 |
| YXG34M | 1.13-1.16 | 11.3-11.6 | 835-884 | 10.5-11.1 | 636-1433 | 8-18 | 246-270 | 31-34 | -0.03 | -0.20 | 300 |
| YXG34 | 1.13-1.16 | 11.3-11.6 | 835-884 | 10.5-11.1 | >1433 | >18 | 246-270 | 31-34 | -0.03 | -0.20 | 350 |
| YXG34H | 1.13-1.16 | 11.3-11.6 | 835-884 | 10.5-11.1 | >1990 | >25 | 246-270 | 31-34 | -0.03 | -0.20 | 350 |
| Low Temperature Coefficient Sm2Co17, (SmEr)2(CoTm)17, SmCo 2:17 magnets | |||||||||||
| YXG22LT | 0.94-0.98 | 9.4-9.8 | 668-716 | 8.4-9.0 | >1194 | >15 | 167-183 | 21-23 | -0.015 | -0.20 | 350 |
Neodymium Magnet Overview and Specs:
Neodymium (NdFeB), Neo, or Neodymium Iron Boron magnet has a variety of applications like brushless DC motors, sensors and loudspeakers, due to its outstanding properties like higher magnetic properties (including residual induction, coercive force, and maximum energy product), more options of magnetic grades and operating temperatures, easier in machining to make many shapes and sizes available, etc.
| Grade | Residual Induction Br |
Coercivity Hcb |
Intrinsic Coercivity Hcj |
Maximum Energy Product (BH)max |
Rev. Temp. Coef. α(Br) |
Rev. Temp. Coef. β(Hcj) |
Max Working Temp. | ||||
| T | kG | kA/m | kOe | kA/m | kOe | kJ/m3 | MGOe | %/°C | %/°C | °C | |
| N35 | 1.17-1.22 | 11.7-12.2 | >868 | >10.9 | >955 | >12 | 263-287 | 33-36 | -0.12 | -0.62 | 80 |
| N38 | 1.22-1.25 | 12.2-12.5 | >899 | >11.3 | >955 | >12 | 287-310 | 36-39 | -0.12 | -0.62 | 80 |
| N40 | 1.25-1.28 | 12.5-12.8 | >907 | >11.4 | >955 | >12 | 302-326 | 38-41 | -0.12 | -0.62 | 80 |
| N42 | 1.28-1.32 | 12.8-13.2 | >915 | >11.5 | >955 | >12 | 318-342 | 40-43 | -0.12 | -0.62 | 80 |
| N45 | 1.32-1.38 | 13.2-13.8 | >923 | >11.6 | >955 | >12 | 342-366 | 43-46 | -0.12 | -0.62 | 80 |
| N48 | 1.38-1.42 | 13.8-14.2 | >923 | >11.6 | >955 | >12 | 366-390 | 46-49 | -0.12 | -0.62 | 80 |
| N50 | 1.40-1.45 | 14.0-14.5 | >796 | >10.0 | >876 | >11 | 382-406 | 48-51 | -0.12 | -0.62 | 80 |
| N52 | 1.43-1.48 | 14.3-14.8 | >796 | >10.0 | >876 | >11 | 398-422 | 50-53 | -0.12 | -0.62 | 80 |
| N33M | 1.13-1.17 | 11.3-11.7 | >836 | >10.5 | >1114 | >14 | 247-263 | 31-33 | -0.11 | -0.60 | 100 |
| N35M | 1.17-1.22 | 11.7-12.2 | >868 | >10.9 | >1114 | >14 | 263-287 | 33-36 | -0.11 | -0.60 | 100 |
| N38M | 1.22-1.25 | 12.2-12.5 | >899 | >11.3 | >1114 | >14 | 287-310 | 36-39 | -0.11 | -0.60 | 100 |
| N40M | 1.25-1.28 | 12.5-12.8 | >923 | >11.6 | >1114 | >14 | 302-326 | 38-41 | -0.11 | -0.60 | 100 |
| N42M | 1.28-1.32 | 12.8-13.2 | >955 | >12.0 | >1114 | >14 | 318-342 | 40-43 | -0.11 | -0.60 | 100 |
| N45M | 1.32-1.38 | 13.2-13.8 | >995 | >12.5 | >1114 | >14 | 342-366 | 43-46 | -0.11 | -0.60 | 100 |
| N48M | 1.36-1.43 | 13.6-14.3 | >1027 | >12.9 | >1114 | >14 | 366-390 | 46-49 | -0.11 | -0.60 | 100 |
| N50M | 1.40-1.45 | 14.0-14.5 | >1033 | >13.0 | >1114 | >14 | 382-406 | 48-51 | -0.11 | -0.60 | 100 |
| N33H | 1.13-1.17 | 11.3-11.7 | >836 | >10.5 | >1353 | >17 | 247-263 | 31-33 | -0.11 | -0.58 | 120 |
| N35H | 1.17-1.22 | 11.7-12.2 | >868 | >10.9 | >1353 | >17 | 263-287 | 33-36 | -0.11 | -0.58 | 120 |
| N38H | 1.22-1.25 | 12.2-12.5 | >899 | >11.3 | >1353 | >17 | 287-310 | 36-39 | -0.11 | -0.58 | 120 |
| N40H | 1.25-1.28 | 12.5-12.8 | >923 | >11.6 | >1353 | >17 | 302-326 | 38-41 | -0.11 | -0.58 | 120 |
| N42H | 1.28-1.32 | 12.8-13.2 | >955 | >12.0 | >1353 | >17 | 318-342 | 40-43 | -0.11 | -0.58 | 120 |
| N45H | 1.32-1.36 | 13.2-13.6 | >963 | >12.1 | >1353 | >17 | 326-358 | 43-46 | -0.11 | -0.58 | 120 |
| N48H | 1.36-1.43 | 13.6-14.3 | >995 | >12.5 | >1353 | >17 | 366-390 | 46-49 | -0.11 | -0.58 | 120 |
| N33SH | 1.13-1.17 | 11.3-11.7 | >844 | >10.6 | >1592 | >20 | 247-263 | 31-33 | -0.11 | -0.55 | 150 |
| N35SH | 1.17-1.22 | 11.7-12.2 | >876 | >11.0 | >1592 | >20 | 263-287 | 33-36 | -0.11 | -0.55 | 150 |
| N38SH | 1.22-1.25 | 12.2-12.5 | >907 | >11.4 | >1592 | >20 | 287-310 | 36-39 | -0.11 | -0.55 | 150 |
| N40SH | 1.25-1.28 | 12.5-12.8 | >939 | >11.8 | >1592 | >20 | 302-326 | 38-41 | -0.11 | -0.55 | 150 |
| N42SH | 1.28-1.32 | 12.8-13.2 | >987 | >12.4 | >1592 | >20 | 318-342 | 40-43 | -0.11 | -0.55 | 150 |
| N45SH | 1.32-1.38 | 13.2-13.8 | >1003 | >12.6 | >1592 | >20 | 342-366 | 43-46 | -0.11 | -0.55 | 150 |
| N28UH | 1.02-1.08 | 10.2-10.8 | >764 | >9.6 | >1990 | >25 | 207-231 | 26-29 | -0.10 | -0.55 | 180 |
| N30UH | 1.08-1.13 | 10.8-11.3 | >812 | >10.2 | >1990 | >25 | 223-247 | 28-31 | -0.10 | -0.55 | 180 |
| N33UH | 1.13-1.17 | 11.3-11.7 | >852 | >10.7 | >1990 | >25 | 247-271 | 31-34 | -0.10 | -0.55 | 180 |
| N35UH | 1.17-1.22 | 11.7-12.2 | >860 | >10.8 | >1990 | >25 | 263-287 | 33-36 | -0.10 | -0.55 | 180 |
| N38UH | 1.22-1.25 | 12.2-12.5 | >876 | >11.0 | >1990 | >25 | 287-310 | 36-39 | -0.10 | -0.55 | 180 |
| N40UH | 1.25-1.28 | 12.5-12.8 | >899 | >11.3 | >1990 | >25 | 302-326 | 38-41 | -0.10 | -0.55 | 180 |
| N28EH | 1.04-1.09 | 10.4-10.9 | >780 | >9.8 | >2388 | >30 | 207-231 | 26-29 | -0.10 | -0.55 | 200 |
| N30EH | 1.08-1.13 | 10.8-11.3 | >812 | >10.2 | >2388 | >30 | 223-247 | 28-31 | -0.10 | -0.55 | 200 |
| N33EH | 1.13-1.17 | 11.3-11.7 | >836 | >10.5 | >2388 | >30 | 247-271 | 31-34 | -0.10 | -0.55 | 200 |
| N35EH | 1.17-1.22 | 11.7-12.2 | >876 | >11.0 | >2388 | >30 | 263-287 | 33-36 | -0.10 | -0.55 | 200 |
| N38EH | 1.22-1.25 | 12.2-12.5 | >899 | >11.3 | >2388 | >30 | 287-310 | 36-39 | -0.10 | -0.55 | 200 |
| N28AH | 1.04-1.09 | 10.4-10.9 | >787 | >9.9 | >2785 | >35 | 207-231 | 26-29 | -0.10 | -0.47 | 230 |
| N30AH | 1.08-1.13 | 10.8-11.3 | >819 | >10.3 | >2785 | >35 | 223-247 | 28-31 | -0.10 | -0.47 | 230 |
| N33AH | 1.13-1.17 | 11.3-11.7 | >843 | >10.6 | >2785 | >35 | 247-271 | 31-34 | -0.10 | -0.47 | 230 |
Surface Plating for Magnets:
| Coating | Coating Layer | Colour | Typical Thickness µm |
SST Hour |
PCT Hour |
Working Temp. °C |
Properties | Typical Appication |
| Nickel | Ni+Cu+Ni, Ni+Ni | Bright Silver | 10-20 | >24-72 | >24-72 | <200 | Most commonly used | Industrial magnets |
| Blue White Zinc | Zn | Blue White | 8-15 | >16-48 | >12 | <160 | Thin and cheap | Electric motor magnets |
| Colour Zinc | 3+Cr Colour Zn | Bright Colour | 5-10 | >36-72 | >12 | <160 | Thin and good adhesion | Speaker magnets |
| Chemical Nickel | Ni+Chemical Ni | Dark Silver | 10-20 | >24-72 | >16 | <200 | Uniform thickness | Electronics |
| Epoxy | Epoxy, Zn+Epoxy | Black / Gray | 10-25 | >96 | >48 | <130 | Soft and good corrosion resistance | Automotive |
| NiCuEpoxy | Ni+Cu+Epoxy | Black / Gray | 15-30 | >72-108 | >48 | <120 | Soft and good corrosion resistance | Linear motor magnets |
| Phosphating | Phosphating | Light Gray | 1-3 | —— | —— | <240 | Temporary Protection | Electric motor magnets |
| Passivation | Passivation | Light Gray | 1-3 | —— | —— | <240 | Temporary Protection | Servo motor magnets |
| Parylene | Parylene | Clear | 3-10 | >24 | —— | <150 | Tensile, light and high reliability | Military, Aerospace |
| Rubber | Rubber | Black | 500 | >72-108 | —— | <130 | Good scratch and corrosion resistance | Holding magnets |
Magnet Safety:
Rare earth magnets or magnetic systems are extremely strong, so the below safety precautions must be brought to the attention of all personnel who may use, handle, or process them so as to avoid personal injury or damage to magnets.
Make sure that magnetized rare earth magnets are under control when they come in contact with each other or ferromagnetic materials. It is important to wear safety glasses and other appropriate protective gear when handling large magnets. Wearing gloves to protect one's hands is also recommended.
Keep ferromagnetic metals away from the work area. Be attentive when working with magnets. Do not work with magnetized magnets if you are under the influence of alcohol, drugs, or controlled substances.
Sensitive electronic instruments and devices may change calibration or be damaged by a powerful magnetic field. Always keep magnetized magnets a safe distance away from sensitive electronic instruments. Special caution should be exercised if one is wearing a pacemaker, because strong magnetic fields can damage the electronics inside pacemakers.
Never swallow magnets or place magnets within the reach of children or mentally impaired adults. If magnets are swallowed, consult a doctor immediately and/or seek immediate medical attention.
Rare earth magnets may create sparks through contact in handling, especially when allowed to impact together. Never handle rare earth magnets in explosive atmospheres because sparking may ignite that atmosphere.
Rare earth powder is combustible; spontaneous combustion can occur when the powder is dry. If grinding, always wet grind magnets to avoid spontaneous combustion of the grinding swarf. Never dry grind. Make sure to have adequate ventilation when grinding magnets. Do not try to machine magnets using conventional tools, as this can produce chipping and shattering. Always wear safety glasses.
Always store rare earth powder or grinding swarf in water-filled containers or hermetically sealed inert atmospheres to prevent spontaneous combustion.
Always dispose of rare earth powder with care. Do not risk fires. Disposing magnetized magnets must be done as to prevent injury when handling.