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Sintered radial neodymiuminfo-icon iron boron ring magnets are oriented by radial alignment of powders.  It can be straight, skew or unipole magnetized.  There are two production methods - sintered powder or hot press (MQ3) method.  Compared to traditional arc magnets or IPM (internal permanent magnetinfo-icon) assemblies, radial rings can improve motor performance and increase yields over traditional motor assembly methods.  These magnets are widely used in DC brushless and servo motors for robotic and automotive applications. 

Product Information

Magnetic Characteristics
GradeBr (Residual Induction) Br (Residual Induction) Hcb (Coercive Force) Hcb (Coercive Force) Hcj (Intrinsic Coercive Force) Hcj (Intrinsic Coercive Force) Bhmax (Maximum Energy Product) Bhmax (Maximum Energy Product)
mT KGs KA/m KOe KOe KA/m KJ/m³ MGOe
N35
1.18-1.23
11.8-12.3
868
10.9
12
955
263-287
33-36
N38
1.23-1.26
12.3-12.6
899
11.3
12
955
287-311
36-39
N40
1.26-1.29
12.6-12.9
907
11.4
12
955
302-327
38-41
N42
1.29-1.33
12.9-13.3
915
11.5
12
955
318-342
40-43
N35H
1.18-1.23
11.8-12.3
868
10.9
17
1353
263-287
33-36
N38H
1.23-1.26
12.3-12.6
899
11.3
17
1353
287-311
36-39
N40H
1.26-1.29
12.6-12.9
923
11.6
17
1353
302-327
38-41
N42H
1.29-1.33
12.9-13.3
955
12.0
17
1353
318-342
40-43
N35SH
1.18-1.23
11.8-12.3
876
11.0
20
1592
263-287
33-36
N38SH
1.23-1.26
12.3-12.6
907
11.4
20
1592
287-311
36-39
N40SH
1.26-1.29
12.6-12.9
939
11.6
20
1592
302-326
38-41
N33UH
1.14-1.18
11.4-11.8
852
10.7
25
1989
247-271
31-34
N35UH
1.18-1.23
11.8-12.3
860
10.8
25
1989
263-287
33-36
HP40H
1.26-1.29
12.6-12.9
923
11.6
17
1353
302-327
38-41
HP35SH
1.18-1.23
11.8-12.3
876
11.0
20
1592
263-287
33-36
HP33UH
1.14-1.18
11.4-11.8
852
10.7
25
1989
247-271
31-34
Composition Characteristics
Auxiliary Characteristics
Thermal Characteristics
Mechanical/Physical Characteristics
Chemical Characteristics
Preferred Geometry
Comparison Chart
Grade BH Curves
GradeType of MaterialIsotropic/AnisotropicBH Curve
N35
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N38
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N40
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N42
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N35H
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N38H
Sintered NdFeB
Anisotropic
Created with Raphaël 2.1.2
N40H
Sintered NdFeB
Anisotropic
N42H
Sintered NdFeB
Anisotropic
N35SH
Sintered NdFeB
Anisotropic
N38SH
Sintered NdFeB
Anisotropic
N40SH
Sintered NdFeB
Anisotropic
N33UH
Sintered NdFeB
Anisotropic
N35UH
Sintered NdFeB
Anisotropic
HP40H
Anisotropic
HP35SH
Anisotropic
HP33UH
Anisotropic
SDS
Hide Section 1 - Product Name
Product Name: Sintered Neodymium Iron Boron (NdFeB) Permanent Magnet
Hide Section 2 - Hazardous Ingredients
Chemical Name: Sintered Neodymium Iron Boron (NdFeB) Permanent Magnet
Material/Component(s):
Material or ComponentWeight %CAS No.ACGUH TLV (mg/m^3)Notes
Neodymium
33%
7440-00-8
Not Established
Iron
65%
7439-89-6
10 (oxide)
Boron
1.3%
7440-42-8
10
test
Nickel
0.01-0.4%
7440-02-0
1 (dust) / 0.1 (fume)
Plating
Copper
0.01-0.2%
7440-50-8
1 (dust) / 0.2 (fume)
Plating
Dysprosium
0-4%
7429-91-6
Not established
May be used in high-temp grades
Cobalt
0-5%
7440-48-4
0.02
May be used in high-temp grades
Praseodymium
0-5%
74410-10-1
Not Established
N/A
Hide Section 3 - Physical Characteristics
Boiling Point: N/A
Vapor Pressure: (mm Hg.) N/A
Vapor Density: (air = 1) N/A
Specific Gravity: 7.1 - 7.6
Melting Point: Above 1000 Degrees C (1832 Degrees F)
Evaporation Rate: N/A
Odor: No Odor
Solubility in Water: Not Soluble
Appearance: Silver-Gray dark metallic
Hide Section 4 - Fire and Explosion Hazard Data
Flash Point: N/A
FLAMMABLE LIMITS: N/A
LEL: N/A
UEL: N/A
Extinguishing Media: Dry Chemicals without Oxygen Compounds or Sand
Special Fire Fighting Procedures: Do not use Halon agents or water on smoldering, burning powder.
Unusual Fire and Explosion Hazards(s): Dry powders of neodymium magnets will oxidize, smolder, and burn rapidly in the presences of air or oxygen. Maintain powders in water slurry or in inert atmospheres of nitrogen or argon to prevent spontaneous combustion. Magnets may spark on impact. Handle carefully in explosive atmospheres.
Hide Section 5 - Reactivity Data
Stability: Stable
Conditions to Avoid: Avoid exposure of powdered magnet material to air, oxygen or halogenated hydrocarbons, and to elevated temperatures above 150 Degrees Celsius.
Incompatibility (Materials to Avoid): Fine powders are incompatible with air, oxygen, halogentated hydrocarbons with strong oxidizers
Hide Section 6 - Health Hazard Data
Health Hazards (Acute & Chronic): Prolonged skin contact may cause irritation or allergenic dermatitis.
Emergency and First Aid Procedures:
Procedure ForProcedure
Skin
Brush off powders and wash well with soap and water.
Eyes
Flush with water until clear.
Hide Section 7 - Precautions for Safe Handling and Use
Spill Procedure: Sweep up dust and store in water slurry or sealed containers utilizing inert atmosphere such as argon or nitrogen to prevent spontaneous combustion.
Waste Disposal Method: Dispose of in accordance with federal, state and local regulations.
Hide Section 8 Control Measures
Respiratory Protection: Use NIOSH approved respirator when TLV is exceeded.
Eye Protection: Use safety glasses or goggles when handling magnets.
Skin Protection: Potective gloves are recommended when handling magnetized part or parts which may have sharp edges.
Ventilation: Use wet machining/grinding processes and adequate local ventilation to reduce dust levels
Work / Hygienic Practices: Use personal protection equipment when required. Use good personal hygiene practices. Keep magnetized parts away from mechanical/electrical instruments which may be damaged by high magnetic fields.
WARNING: RARE EARTH MAGNETS ARE EXTREMELY POWERFUL! They have very strong magnetic forces which make them attract to other magnets and other ferromagnetic materials such as iron or steel. HANDLE WITH EXTREME CAUTION!