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Available Neodymium Magnet Grades

(Magnetic and Physical Characteristics)

Many grades of Neodymium magnets exist to support a variety of industrial applications.  The range of Neo grades typically extends from 33 MGOe to 52 MGOe.  This range allows for optimizing cost, performance, and operational temperature resistance.

The typical convention for “Grade” is to use the value of the particular magnet alloy’s Energy Density or Maximum Energy Product.  Oftentimes there are letters or a two digit number suffix attached to the Grade which indicates the Intrinsic Coercive Force (Hci) level of the magnet alloy.  This Hci is a good indicator of the maximum allowable temperature a particular Neo alloy can tolerate before irreversible demagnetizing occurs.

The higher the “Grade number” then the higher the Energy Density.  Usually the higher the Energy Density the stronger the magnet, but this is very much dependent upon the magnet’s operational environment.

* Maximum Operating Temperature for this Group is 60°C / 140°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
5011N5014.0 - 14.51.40 - 1.4510.58361187647 - 51374 - 406
5211N5214.4 -14.81.44 - 1.4810.58361187649 - 53390 - 422

* Maximum Operating Temperature for this Group is 80°C / 176°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
3512N3511.8 - 12.31.18 - 1.2310.98681295534 - 36263 - 287
3812N3812.3 - 12.61.23 - 1.2611.38991295536 - 39287 - 311
4012N4012.6 - 12.91.26 - 1.2911.49071295538 - 41302 - 327
4212N4212.9 - 13.31.29 - 1.3311.59151295540 - 43318 - 342
4512N4513.3 - 13.71.33 - 1.3711.08761295543 - 46342 - 366
4812N4813.7-14.11.37 - 1.4110.58361295545 - 49358 - 390

* Maximum Operating Temperature for this Group is 100°C / 212°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
3314N33M11.3 - 11.81.13 - 1.1810.5836141,11431 - 34247 - 271
3514N35M11.8 - 12.31.18 - 1.2310.9868141,11434 - 36263 - 287
3814N38M12.3 - 12.61.23 - 1.2611.3899141,11436 - 39287 - 311
4014N40M12.6 - 12.91.26 - 1.2911.6923141,11438 - 41302 - 327
4214N42M12.9 - 13.31.29 - 1.3312.0955141,11440 - 43318 - 342
4514N45M13.3 - 13.71.33 - 1.3712.5995141,11443 - 46342 - 366
4814N48M13.7 -14.11.37 - 1.4112.91,027141,11445 - 49358 - 390
5014N50M14.0 - 14.51.40 - 1.4513.01,033141,11447 - 51374 - 406

* Maximum Operating Temperature for this Group is 120°C / 248°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
3017N30H10.8 - 11.31.08 - 1.1310796171,35328 - 31223 - 247
3317N33H11.3 - 11.81.13 - 1.1810.5836171,35331 - 34247 - 271
3517N35H11.8 - 12.31.18 - 1.2310.9868171,35334 - 36263 - 287
3817N38H12.3 - 12.61.23 - 1.2611.3899171,35336 - 39287 - 311
4017N40H12.6 - 12.91.26 - 1.2911.6923171,35338 - 41302 - 327
4217N42H12.9 - 13.31.29 - 1.3312955171,35340 - 43318 - 342
4517N45H13.3 - 13.71.3 - 1.3712.3979171,35343 - 46342-366
4817N48H13.7 - 14.11.37 - 1.4112.5995171,35345 - 49358-390

* Maximum Operating Temperature for this Group is 150°C / 302°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
3020N30SH10.8 - 11.41.08 - 1.1410.1804201,59228 - 31223 - 247
3320N33SH11.4 - 11.81.14 - 1.1810.6844201,59231 - 34247 - 271
3520N35SH11.8 - 12.31.18 - 1.2311.0876201,59233 - 36263 - 287
3820N38SH12.3 - 12.61.23 - 1.2611.4907201,59236 - 39287 - 311
4020N40SH12.6 - 12.91.26 - 1.2911.6939201,59238 - 41302 - 326
4220N42SH12.9 - 13.31.29 - 1.3312.4987201,59240 - 43318 - 342
4520N45SH13.3 - 13.71.33 - 1.3712.61,003201,59242 - 46334 - 366

* Maximum Operating Temperature for this Group is 180°C / 356°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
2825N28UH10.4 - 10.81.04 - 1.089.6764251,98926 - 29207 - 231
3025N30UH10.8 - 11.41.08 - 1.1410.1804251,98928 - 31223 - 247
3325N33UH11.4 - 11.81.14 - 1.1810.7852251,98931 - 34247 - 271
3525N35UH11.8 - 12.31.18 - 1.2310.8860251,98933 - 36263 - 287
3825N38UH12.3 - 12.61.23 - 1.2611.3899251,98936 - 39287 - 311
4025N40UH12.5 - 12.91.25 - 1.2911.4907251,98938 - 41302 - 326
4225N42UH12.8 - 13.31.28 - 1.3311.6923251,98940 - 43318 - 342

* Maximum Operating Temperature for this Group is 200°C / 392°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
2830N28EH10.4 - 10.81.04 - 1.089.8780302,38826 - 29207 - 231
3030N30EH10.8 - 11.41.08 - 1.1410.1804302,38828 - 31223 - 247
3330N33EH11.4 - 11.81.14 - 1.1810.3820302,38831 - 34247 - 271
3530N35EH11.7 - 12.31.17 - 1.2310.5836302,38833 - 36263 - 287
3830N38EH12.2- 12.61.22 - 1.2611.3899302,38835 - 39278 - 311

* Maximum Operating Temperature for this Group is 230°C / 446°F ( L/D ≥0.7)
Dura
Magnet
Grade
Common
Industry
Notation
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
RangeMinimumMinimumRange
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3
2835N28AH10.4 - 10.91.04 - 1.099.8780352,78526 - 29207 - 231
3035N30AH10.8 - 11.31.08 - 1.1310.1804352,78528 - 31223 - 247
3335N33AH11.3 - 11.81.13 - 1.1810.3820332,62531 - 34247 - 271
3535N35AH11.7 - 12.31.17 - 1.2310.5836332,62533 - 36263 - 287

Reversible Temperature Coefficients (0°C to 100°C)
Intrinsic Coercive Force (Hci)Induction Br (G)Intrinsic Coercivity Hci (Oe)
(KOe)(%)(%)
11-0.12%-0.70%
12-0.12%-0.70%
14-0.12%-0.65%
17-0.11%-0.65%
20-0.11%-0.60%
25-0.10%-0.55%
30-0.10%-0.50%
35-0.09%-0.40%
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = 20°C - 100°C]
β = Δ Hci / Δ T * 100 (Hci @ 20°C) [ΔT = 20°C - 100°C]
Neodymium Magnets - Physical Properties
PropertyUnitsValues
Vickers HardnessHv≥550
Densityg/cm3≥7.4
Curie Temp TC°C312 - 380
Curie Temp TF°F593 - 716
Specific ResistanceμΩ⋅Cm150
Bending StrengthMpa250
Compressive StrengthMpa1000~1100
Thermal Expansion Parallel (∥) to Orientation (M)°C-1(3-4) x 10-6
Thermal Expansion Perpendicular (⊥) to Orientation (M)°C-1-(1-3) x 10-6
Young's Moduluskg/mm21.7 x 104

The listed values are approximate and should be used as a reference.  Any magnetic or physical characteristics should be substantiated before selecting a magnet material.  Please engage Dura’s magnet Design / Development team before selecting a design path.

Technical Articles
Making Sense of Neodymium Magnet Grades

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