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Permanent Magnetic Materials

Sizes & Tolerances

We can produce different shapes, like disc, cylinder, ring, arc segment, and custom complicated shapes. A wide range of sizes is possible with a few limits. The standard tolerances are generally +/-0.1mm, while they slightly vary depending on how big the size is.

Shape Drawing Size Standard Max.
Disc D ≤100 mm ≤150 mm
T 0.5 ≤ T ≤ 45 mm 0.5 ≤ T ≤ 60 mm
Block L ≤150 mm ≤200 mm
W ≤100 mm ≤150 mm
T ≤55 mm ≤70 mm
Ring D ≤100 mm ≤150 mm
d ≤90 mm ≤145 mm
T 0.5 ≤ T ≤ 45 mm 0.5 ≤ T ≤ 60 mm
Arc L ≤150 mm ≤2000 mm
W ≤100 mm ≤100 mm
T 2 ≤ T ≤ 30 mm 1.5 ≤ T ≤ 50 mm

Magnetization

All Neodymium magnets are anisotropic and oriented with a preferred direction during production, they can only be magnetized thru the oriented direction. Disc/cylinder/ring magnets are axially or diametrically magnetized, block magnets are magnetized along one side of three side, arc segment magnets are generally diametrically magnetized.

Surface Coating

The corrosion resistance of Neodymium magnets is considered very poor; a surface coating will be necessary. The most common coatings are: NiCuNi, Zn, Black epoxy, Teflon/PTFE, and Rubber/Plastic.
Coating Thickness Color PCT  SST
Zn 4-8μm Blue White - 24~48h
Colored Zn 4-8μm Colorful - 48~72h
NiCuNi 10-20μm Silver 48~72h 24~72h
Black Nickel 10-20μm Black >72h 48~96h
Chemical Nickel 10-30μm Silver >72h >96h
Epoxy 10-30μm Black / Grey - 72~108h
Teflon 10-20μm Black - 48~72h
Phosphated/Passivated ≤1μm Dark Grey - ≤2.5h
Sn 10-25μm Silver >48h 36~72h
Au 10-15μm Golden >48h >12h

Magnetic Properties Table

N M H SH UH EH&AH

Magnetic Properties Table of N

Grade Remanence Coercive Force Intrinsic Coercive Force Max Energy Product Temperature Coefficient Working Temp Density
Br Hcb Hcj (BH)max α Br β Hcj Tw P
T kGs kAm kOe kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ 2g/cm
N55   ≥1.45 ≥14.5 836  10.5  ≥955 ≥12 406-437 51-55 -0.12  -0.8  80  ≥7.5
N54   ≥1.44 ≥14.4 836  10.5  ≥955 ≥12 398-437 50-55 -0.12  -0.8  80  ≥7.5
N52 1.42-1.44 14.2-14.4 836  10.5  ≥955 ≥12 390-422 49-53 -0.12  -0.8  80  ≥7.5
N50 1.4-1.42 14-14.2 836  10.5  ≥955 ≥12 374-406 47-51 -0.12  -0.8  80  ≥7.5
N48 1.37-1.4 13.7-14 915  11.5  ≥955 ≥12 366-390 46-49 -0.12  -0.8  80  ≥7.5
N45 1.32-1.37 13.2-13.7 915  11.5  ≥955 ≥12 342-366 43-46 -0.12  -0.8  80  ≥7.5

Magnetic Properties Table of M

Grade Remanence Coercive Force Intrinic Coercive Force Max Energy Product Temperature Coefficient
Working Temp		 Density
Br Hcb Hcj (BH)max α Br β Hcj Tw p
T kGs kA/m kOe kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ ₂g/cm
54M   ≥1.44 ≥14.4 1056  13.3  ≥1114 ≥14 398-422 50-53 -0.12  -0.8  100  ≥7.5
52M 1.42-1.44 14.2-14.4 1056  13.3  ≥1114 ≥14 390-422 49-53 -0.12  -0.8  100  ≥7.5
50M 1.4-1.42 14-14.2 1034  13.0  ≥1114 ≥14 374-406 47-51 -0.12  -0.8  100  ≥7.5
48M 1.37-1.4 13.7-14 1019  12.8  ≥1114 ≥14 366-390 46-49 -0.12  -0.8  100  ≥7.5
45M 1.32-1.37 13.2-13.7 1008  12.7  ≥1114 ≥14 342-366 43-46 -0.12  -0.8  100  ≥7.5
42M 1.28-1.32 12.8-13.2 970  12.2  ≥1114 ≥14 318-342 40-43 -0.12  -0.8  100  ≥7.5

Magnetic Properties Table of H

Grade Remanence Coercive Force Intrinic Coercive Force Max Energy Product Temperature Coefficient Working Temp Density
Br Hcb Hcj (BH)max α Br β Hcj Tw p
T kGs kA/m kOe  kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ 2g/cm
54H ≥1.44 ≥14.4 1056  13.3  ≥1353 ≥17 398-422 50-53 -0.12  -0.7  120  ≥7.5
52H 1.42-1.44 14.2-14.4 1056  13.3  ≥1353 ≥17 390-422 49-53 -0.12  -0.7  120  ≥7.5
50H 1.4-1.42 14-14.2 1034  13.0  ≥1353 ≥17 374-406 47-51 -0.12  -0.7  120  ≥7.5
48H 1.37-1.4 13.7-14 1019  12.8  ≥1353 ≥17 366-390 46-49 -0.12  -0.7  120  ≥7.5
45H 1.32-1.37 13.2-13.7 1008  12.7  ≥1353 ≥17 342-366 43-46 -0.12  -0.7  120  ≥7.5
42H 1.28-1.32 12.8-13.2 970  12.2  ≥1353 ≥17 318-342 40-43 -0.12  -0.7  120  ≥7.5
40H 1.26-1.28 12.6-12.8 948  11.9  ≥1353 ≥17 302-326 38-41 -0.12  -0.7  120  ≥7.5

Magnetic Properties Table of SH

Grade Remanence Coercive Force Intrinsic Coercive Force
Max Energy Product		 Temperature Coefficient
Working Temp		 Density
Br Hcb Hcj (BH)max α Br β Hcj Tw P
T kGs kAm kOe kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ 2g/cm
52SH 1.42–1.44 14.2–14.4 1056 13.3 ≥ 1592 ≥ 20 390–422 49–53 –0.12 –0.6 150 ≥ 7.5
50SH 1.41–1.44 14.2–14.4 1034 13 ≥ 1592 ≥ 20 370–406 47–51 –0.12 –0.6 150 ≥ 7.5
48SH 1.37–1.4 13.7–14 1019 12.8 ≥ 1592 ≥ 20 366–390 46–49 –0.12 –0.6 150 ≥ 7.5
45SH 1.32–1.37 13.2–13.7 1008 12.7 ≥ 1592 ≥ 20 342–366 43–46 –0.12 –0.6 150 ≥ 7.5
42SH 1.28–1.32 12.8–13.2 970 12.2 ≥ 1592 ≥ 20 306–342 40–43 –0.12 –0.6 150 ≥ 7.5
40SH 1.26–1.28 12.6–12.8 948 11.9 ≥ 1592 ≥ 20 302–326 38–41 –0.12 –0.6 150 ≥ 7.5
38SH 1.22–1.26 12.2–12.6 925 11.6 ≥ 1592 ≥ 20 287–310 36–39 –0.12 –0.6 150 ≥ 7.5
35SH 1.17–1.22 11.7–12.2 887 11.1 ≥ 1592 ≥ 20 263–287 33–36 –0.12 –0.6 150 ≥ 7.5
33SH 1.13–1.17 11.3–11.7 857 10.8 ≥ 1592 ≥ 20 247–271 31–34 –0.12 –0.6 150 ≥ 7.5
30SH 1.08–1.13 10.8–11.3 819 10.3 ≥ 1592 ≥ 20 223–254 28–32 –0.12 –0.6 150 ≥ 7.5

Magnetic Properties Table of UH

Grade Remanence Coercive Force Intinsic Coercive Force Max Energy Product Temperature Coefficient Working Temp Density
Br Hcb Hcj (BH)max α Br β Hcj Tw p
T kGs kA/m kOe kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ 2g/cm
48UH 1.36-1.4 13.6-14 1029  12.9  ≥1990 ≥25 366-390 46-49 -0.12  -0.6  180  ≥7.5
45UH 1.32-1.37 13.2-13.7 1008  12.7  ≥1990 ≥25 342-366 43-46 -0.12  -0.6  180  ≥7.5
42UH 1.28-1.32 12.8-13.2 970  12.2  ≥1990 ≥25 318-342 40-43 -0.12  -0.6  180  ≥7.5
40UH 1.26-1.28 12.6-12.8 948  11.9  ≥1990 ≥25 302-326 38-41 -0.12  -0.6  180  ≥7.5

Magnetic Properties Table of EH&AH

Grade Remanence Coercive Force Intrinsic Coercive Force Max Energy Product Temperature Coefficient Working Temp Density
Br Hcb Hcj (BH)max α Br β Hcj Tw p
T kGs kA/m kOe kA/m kOe ₃KJ/m MGOe %/℃ %/℃ ℃ 2g/cm
38EH 1.22-1.26 12.2-12.6 925  11.6  ≥2388 ≥30 287-310 36-39 -0.12  -0.5  200  ≥7.5
35EH 1.17-1.22 11.7-12.2 887  11.1  ≥2388 ≥30 263-287 33-36 -0.12  -0.5  200  ≥7.5
33EH 1.13-1.17 11.3-11.7 857  10.8  ≥2388 ≥30 247-271 31-34 -0.12  -0.5  200  ≥7.5
30EH 1.08-1.13 10.8-11.3 819  10.3  ≥2388 ≥30 223-255 28-32 -0.12  -0.51  200  ≥7.5
28EH 1.02-1.08 10.2-10.8 773  9.7  ≥2388 ≥30 207-231 26-29 -0.12  -0.51  200  ≥7.5
40AH .25-1.28 2.5-12.8 948  11.9  ≥2786 ≥35 302-326 38-41 -0.12  -0.51  220  ≥7.5
38AH 1.22-1.26 2.2-12.6 925  11.6  ≥2786 ≥35 287-310 36-39 -0.12  -0.51  220  ≥7.5
35AH 1.17-1.22 11.7-12.2 887  17.1  ≥2786 ≥35 263-287 33-36 -0.12  -0.51  220  ≥7.5
33AH 1.13-1.17 11.3-11.7 857  10.8  ≥2786 ≥35 247-271 31-34 -0.12  -0.51  220  ≥7.5
30AH 1.08-1.13 10.8-11.3 819  10.3  ≥2786 ≥35 223-255 28-32 -0.12  -0.51  220  ≥7.5
28AH 1.02-1.08 0.2-10.8 773  9.7  ≥2786 ≥35 199-231 25-29 -0.12  -0.51  220  ≥7.5

Demagnetization Curve Chart

Demagnetization Curve Diagram of Conventional Magnets

54H

52SH

Demagnetization Curve Diagram of Diffused Magnets

52UH

50UH

Demagnetization Curve Of Weightless Rare Earth Magnet

54H

45SH

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