Rare Earth Magnets Specs

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.