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SmCo(Samarium Cobalt) Magnets

SmCo(Samarium Cobalt) Magnets

Place of Origin : China
Brand Name : SINONEO
Certification : ROHS
Model Number : NEO-SM01
MOQ : 100PCS
Packaging Details : CARTONS
Delivery Time : 10~30DAYS
Payment Terms : TT/WESTERN UNION
Supply Ability : 5000T/YEAR
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Permanent Samarium Cobalt magnets (SmCo) are composed of samarium, cobalt and iron. These rare earth magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

Attributes of Samarium Cobalt

  • High resistance to demagnetization
  • High energy (magnetic strength is strong for its size)
  • Good temperature stability
  • Expensive material (cobalt is market price sensitive)

Applications of Samarium Cobalt

Computer disc drives, sensors, traveling wave tubes, linear actuators, satellite systems, motors where temporary stability is vital.


For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater.

Magnetizing and Handling
Samarium Cobalt magnets are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets can chip if allowed to “jump at” an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

Samarium Cobalt Machining
Since Samarium Cobalt magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. It can, however, be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.

Application of SmCo Magnets :

SmCo magnet is widely used in motors, watch, transducers, instruments, positional detector, generators, radar, etc.


Due to their extremely high magnetic strength and brittle nature, SmCo magnet parts must be handled very carefully to prevent injury to personnel and damage to the magnets. Receiving and assembly personnel must be pre-warned about the dangers of handling these magnet parts.

Typical Magnetic Properties of Sintered SmCo Magnet

GradeMax. Energy ProductRemanenceCoercive ForceRev. Temp. Coeff.Working Temp.Density
SmCo5 16A16.0130.08.28207.5600>16.0>1270-0.050.252508.4
SmCo5 16B16.0130.08.28207.5600>20.0>1590-0.050.252508.4
SmCo5 18A18.0146.38.78708.2656>16.0>1272-0.050.252508.4
SmCo5 18B18.0146.38.78708.2656>20.0>1590-0.050.252508.4
SmCo5 20A20.0162.59.09008.6690>16.0>1272-0.050.252508.4
SmCo5 20B20.0162.59.09008.6690>20.0>1590-0.050.252508.4
SmCo5 22A22.0178.89.59509.1728>16.0>1272-0.050.252508.4
SmCo5 22B22.0178.89.59509.1728>20.0>1590-0.050.252508.4
Sm2Co17 2424.0195.010.010009.5760>20.0>1590-0.030.233008.3
Sm2Co17 26A26.0211.310.610609.8784>16.0>1272-0.030.233008.3
Sm2Co17 26B26.0211.310.610609.8784>20.0>1590-0.030.233008.3
Sm2Co17 26H26.0211.310.610609.8784>26.0>2067-0.030.233008.3
Sm2Co17 28B28.0227.510.9109010.0800>20.0>1590-0.030.233008.3
Sm2Co17 28H28.0227.510.9109010.0800>26.0>2067-0.030.233008.3
Sm2Co17 30A30.0243.811.0110010.2816>16.0>1272-0.030.233008.3
Sm2Co17 30B30.0243.811.2112010.2816>20.0>1590-0.030.233008.3
Sm2Co17 3231.0251.811.5115010.0800>15.0>1192-0.030.233008.3
Sm2Co17 25H25.0203.210.510509.7776>35.0>2782-0.030.233758.3

Note: Special properties can be achieved with custom method.

Physical Characteristics of Sintered SmCo Magnet

HardnessHV 10
Compression Strength300 - 900 N/mm2
Bending Strength120 N/mm2
Modulus1.2-2.0x104 N/mm3
Electrical Resistance at 20°C>0.5 ohm-cm
Specific Heat Capacity370 J/(kg.C)

1. The minimum dimension is 0.079" Diameter.
2. All shapes and properties can be supplied to meet customers' requirements.

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