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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
5011ND-5014.0 - 14.51.40 - 1.4510.58361187647 - 51374 - 406
5211ND-5214.4 -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
3512ND-3511.8 - 12.31.18 - 1.2310.98681295534 - 36263 - 287
3812ND-3812.3 - 12.61.23 - 1.2611.38991295536 - 39287 - 311
4012ND-4012.6 - 12.91.26 - 1.2911.49071295538 - 41302 - 327
4212ND-4212.9 - 13.31.29 - 1.3311.59151295540 - 43318 - 342
4512ND-4513.3 - 13.71.33 - 1.3711.08761295543 - 46342 - 366
4812ND-4813.7-14.11.37 - 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
3314ND-33M11.3 - 11.81.13 - 1.1810.5836141,11431 - 34247 - 271
3514ND-35M11.8 - 12.31.18 - 1.2310.9868141,11434 - 36263 - 287
3814ND-38M12.3 - 12.61.23 - 1.2611.3899141,11436 - 39287 - 311
4014ND-40M12.6 - 12.91.26 - 1.2911.6923141,11438 - 41302 - 327
4214ND-42M12.9 - 13.31.29 - 1.3312.0955141,11440 - 43318 - 342
4514ND-45M13.3 - 13.71.33 - 1.3712.5995141,11443 - 46342 - 366
4814ND-48M13.7 -14.11.37 - 1.4112.91,027141,11445 - 49358 - 390
5014ND-50M14.0 - 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
3017ND-30H10.8 - 11.31.08 - 1.1310796171,35328 - 31223 - 247
3317ND-33H11.3 - 11.81.13 - 1.1810.5836171,35331 - 34247 - 271
3517ND-35H11.8 - 12.31.18 - 1.2310.9868171,35334 - 36263 - 287
3817ND-38H12.3 - 12.61.23 - 1.2611.3899171,35336 - 39287 - 311
4017ND-40H12.6 - 12.91.26 - 1.2911.6923171,35338 - 41302 - 327
4217ND-42H12.9 - 13.31.29 - 1.3312955171,35340 - 43318 - 342
4517ND-45H13.3 - 13.71.3 - 1.3712.3979171,35343 - 46342-366
4817ND-48H13.7 - 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
3020ND-30SH10.8 - 11.41.08 - 1.1410.1804201,59228 - 31223 - 247
3320ND-33SH11.4 - 11.81.14 - 1.1810.6844201,59231 - 34247 - 271
3520ND-35SH11.8 - 12.31.18 - 1.2311.0876201,59233 - 36263 - 287
3820ND-38SH12.3 - 12.61.23 - 1.2611.4907201,59236 - 39287 - 311
4020ND-40SH12.6 - 12.91.26 - 1.2911.6939201,59238 - 41302 - 326
4220ND-42SH12.9 - 13.31.29 - 1.3312.4987201,59240 - 43318 - 342
4520ND-45SH13.3 - 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
2825ND-28UH10.4 - 10.81.04 - 1.089.6764251,98926 - 29207 - 231
3025ND-30UH10.8 - 11.41.08 - 1.1410.1804251,98928 - 31223 - 247
3325ND-33UH11.4 - 11.81.14 - 1.1810.7852251,98931 - 34247 - 271
3525ND-35UH11.8 - 12.31.18 - 1.2310.8860251,98933 - 36263 - 287
3825ND-38UH12.3 - 12.61.23 - 1.2611.3899251,98936 - 39287 - 311
4025ND-40UH12.5 - 12.91.25 - 1.2911.4907251,98938 - 41302 - 326
4225ND-42UH12.8 - 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
2830ND-28EH10.4 - 10.81.04 - 1.089.8780302,38826 - 29207 - 231
3030ND-30EH10.8 - 11.41.08 - 1.1410.1804302,38828 - 31223 - 247
3330ND-33EH11.4 - 11.81.14 - 1.1810.3820302,38831 - 34247 - 271
3530ND-35EH11.7 - 12.31.17 - 1.2310.5836302,38833 - 36263 - 287
3830ND-38EH12.2- 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
2835ND-28AH10.4 - 10.91.04 - 1.099.8780352,78526 - 29207 - 231
3035ND-30AH10.8 - 11.31.08 - 1.1310.1804352,78528 - 31223 - 247
3335ND-33AH11.3 - 11.81.13 - 1.1810.3820332,62531 - 34247 - 271
3535ND-35AH11.7 - 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 106
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

Did You Know?

Neodymium magnets are the strongest magnet material available, with strengths ranging from 30MGOe to 52MGOe Energy Product.

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