NdFeB Magnets Neodymium Iron Boron Standard Datasheet
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Neodymium Iron Boron Magnets Datasheet
NdFeB magnets are also know as Neo, Neodymium Iron Boron, NdBFe, NIB,
Super Strength, and Rare Earth Magnets (although SmCo also shares this term).
This data sheet covers the standard production 55. range of NdFeB magnets
(currently 55 grades) that are commonly in use. They are used in nearly all
Industries:- Automotive, Aerospace, Wind Turbine, Military, White Goods,
Lighting, Food Preparation, Separation, Motor and Generator Industries are
just a few example Industries. Our NdFeB magnets are all REACH and ROHS
compliant. They do not contain any SVHC. NdFeB is produced to ISO9001
and ISO14001 Quality Control Standards. CofC, with PPAP is available for our
NdFeB magnets.TS16949 also is available. NdFeB magnets can be made in
blocks, discs, rings, arcs, spheres, triangles, trapezoids and many other shapes
as stock and custom items. We manufacture NdFeB assemblies. We have a
NDA (Confidentiality Agreement) form if you require peace of mind relating
to confidentiality.
The most common range of NdFeB (Nxx versions) will usually operate at up to
+80 degrees C. The temperature ratings are guideline values.
Higher temperature versions (NxxM, NxxH, NxxSH, NxxUH, NxxEH, NxxVH/AH)
are rated from up to +100 degrees C to a maximum of up to +230 degrees
C. The total magnetic circuit (magnet shape, other components, surrounding
environmental conditions) can impact on the actual maximum temperature
and performance. In some applications the temperature at which significant
weakening is seen may be at or slightly above the recommended maximum
temperature. In some applications the temperature at which significant
weakening is seen may be noticeably below the recommended maximum
temperature it depends on the application.
All should have some form of protective coating to minimise
NdFeB magnetsand ideally prevent corrosion. Uncoated is not advised. The default / standard
protective coating is Ni−Cu−Ni plating. Other coatings/finishes exist (over
40 finishes are currently available). Where maximum corrosion resistance is
required for NdFeB, consider using the increased corrosion resistance range
of NdFeB alloys.
If you require assistance on the grade(s) to select, please contact us. We will
safely guide you (and explain it all) based on your requirements. The process
may involve discussing confidential details relating to your application − we
can do this under NDA / Confidentiality Agreement.
Nxx??
Material
Br Hc (Hcb) Hci (Hcj) BHmax
mT G kA/m Oe kA/m Oe kJ/m 3 MGOe
N27 1,030 10,300 796 10,000 955 12,000 199 25
N30 1,080 10,800 796 10,000 955 12,000 223 28
N33 1,130 11,300 836 10,500 955 12,000 247 31
N35 1,170 11,700 867 10,900 955 12,000 263 33
N38 1,210 12,100 899 11,300 955 12,000 287 36
N40 1,240 12,400 923 11,600 955 12,000 302 38
N42 1,280 12,800 923 11,600 955 12,000 318 40
N45 1,320 13,200 875 11,000 955 12,000 342 43
N48 1,380 13,800 836 10,500 875 11,000 366 46
N50 1,400 14,000 796 10,000 875 11,000 382 48
N52 1,430 14,300 796 10,000 875 11,000 398 50
N27 M 1,030 10,300 796 10,000 1,114 14,000 199 25
N30 M 1,080 10,800 796 10,000 1,114 14,000 223 28
N33 M 1,130 11,300 836 10,500 1,114 14,000 247 31
N35 M 1,170 11,700 867 10,900 1,114 14,000 263 33
N38 M 1,210 12,100 899 11,300 1,114 14,000 286 36
N40 M 1,240 12,400 923 11,600 1,114 14,000 302 38
N42 M 1,280 12,800 923 11,600 1,114 14,000 318 40
N45 M 1,320 13,200 875 11,000 1,114 14,000 342 43
N48 M 1,370 13,700 1,035 13,000 1,114 14,000 366 46
N50 M 1,400 14,000 1,035 13,000 1,114 14,000 382 48
N27 H 1,030 10,300 796 10,000 1,353 17,000 199 25
N30 H 1,080 10,800 796 10,000 1,353 17,000 223 28
N33 H 1,130 11,300 836 10,500 1,353 17,000 247 31
N35 H 1,170 11,700 867 10,900 1,353 17,000 263 33
N38 H 1,210 12,100 899 11,300 1,353 17,000 286 36
N40 H 1,240 12,400 923 11,600 1,353 17,000 302 38
N42 H 1,280 12,800 955 12,000 1,353 17,000 318 40
N45 H 1,320 13,200 995 12,500 1,353 17,000 342 43
N48 H 1,370 13,700 995 12,500 1,353 17,000 366 46
N50 H 1,400 1,400 995 12,500 1353 17,000 382 48
N27 SH 1,030 10,300 804 10,100 1,592 20,000 199 25
N30 SH 1,080 10,800 804 10,100 1,592 20,000 223 28
N33 SH 1,130 11,300 844 10,600 1,592 20,000 247 31
N35 SH 1,170 11,700 875 11,000 1,592 20,000 263 33
N38 SH 1,210 12,100 907 11,400 1,592 20,000 286 36
N40 SH 1,240 12,400 939 11,800 1,592 20,000 302 38
N42 SH 1,280 12,800 963 12,100 1,592 20,000 318 40
N45 SH 1,320 13,200 1,003 12,600 1,592 20,000 342 43
N27 UH 1,030 10,300 764 9,600 1,989 25,000 199 25
N30 UH 1,080 10,800 812 10,200 1,989 25,000 223 28
N33 UH 1,130 11,300 851 10,700 1,989 25,000 247 31
N35 UH 1,170 11,700 875 11,000 1,989 25,000 263 33
N38 UH 1,210 12,100 875 11,000 1,989 25,000 287 36
N40 UH 1,240 12,400 899 11,300 1,989 25,000 302 38
N42 UH 1,280 1,280 875 11,000 1,989 2,500 318 40
N27 EH 1,030 10,300 780 9,800 2,387 30,000 199 25
N30 EH 1,080 10,800 812 10,200 2,387 30,000 223 28
N33 EH 1,130 11,300 836 10,500 2,387 30,000 247 31
N35 EH 1,170 11,700 875 11,000 2,387 30,000 263 33
N38 EH 1,220 12,200 899 11,300 2,387 30,000 287 36
N27 VH / AH 1,030 10,300 772 9,700 2,785 35,000 199 25
N30 VH / AH 1,080 10,800 812 10,200 2,785 35,000 223 28
N33 VH / AH 1,140 11,400 851 10,700 2,785 35,000 247 31
N35 VH / AH 1,170 11,700 875 11,000 2,785 35,000 263 33
Nxx??
Material
Br Hc (Hcb) Hci (Hcj) BHmax
mT G kA/m Oe kA/m Oe kJ/m 3 MGOe
Chinese Standard − commonly used in UK, Europe and now Globally
Minimum Values
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American Standard - not commonly used
Typical Values
Material
Br Hc (Hcb) Hci (Hcj) BHmax
mT G kA/m Oe kA/m Oe kJ/m 3 MGOe
24/41 1,000 10,000 764 9,600 3,263 41,000 190 24.0
26/32 1,050 10,500 803 10,090 2,507 31,500 205 26.0
28/23 1,050 10,500 820 10,300 1,830 23,000 225 28.0
28/32 1,073 10,730 835 10,490 2,507 31,500 225 28.0
30/19 1,130 11,300 859 10,800 1,512 19,000 240 30.0
30/27 1,130 11,300 859 10,800 2,149 27,000 240 30.0
32/16 1,180 11,800 891 11,200 1,273 16,000 255 32.0
32/31 1,160 11,600 883 11,100 2,467 31,000 255 32.0
34/22 1,196 11,960 915 11,500 1,771 22,250 270 34.0
36/19 1,231 12,310 917 11,520 1,523 19,140 285 36.0
36/26 1,220 12,200 931 11,700 2,069 26,000 285 36.0
38/15 1,250 12,500 955 12,000 1,194 15,000 300 38.0
38/23 1,240 12,400 955 12,000 1,830 23,000 300 38.0
40/15 1,280 12,800 955 12,000 1,194 15,000 320 40.0
40/23 1,290 12,900 987 12,400 1,830 23,000 320 40.0
42/15 1,310 13,100 1,011 12,700 1,194 15,000 335 42.0
44/15 1,350 13,500 1,035 13,000 1,194 15,000 350 44.0
48/11 1,375 13,750 820 10,300 875 11,000 380 48.0
50/11 1,410 14,100 820 10,300 875 11,000 400 50.0
Direction of Magnetisation, DoM
NdFeB magnets are sintered anisotropic materials - they have a preferred
direction of magnetisation locked into their structure. So the magnet can
only be magnetised in one axis - any attempt to magnetise in another axis
results in very little performance. Each NdFeB magnet has a Direction of
Magnetisation (DoM). In drawings the poles are labelled (with a North or
a South) or the magnet shape has an arrow inside it - this arrow points to
the North pole face (the other end is the South pole face). Sometimes one
dimension in the description ends in a letter “A”. The A (Alignment or Axis)
indicates the DoM axis it is magnetised in. The value ending mmA or inchA
is the distance between North and South Pole faces. e.g. D10mm x 2mm
A is an axially magnetised magnet; 40mm x 20mm x 10mmA has 10mm
between the North and South faces. The North pole face of a permanent
magnet is a North seeking pole (it seeks the geographic North). By scientific
definition of unlike poles attracting, the Earth’s geographic North pole is
actually a magnetic South pole. We use this definition for DoM.
Temperature Ratings
(Please note - your application will affect the performance
available)
Magnet Type Suffix
Rev. Temp. Coef. of
Induction (Br), α,
%/°C (20-100°C)
Rev. Temp. Coef. of
Intrinsic Coercivity
(Hci), β,
%/°C (20-100°C)
Max. Working
Temperature
(based on a High
working point)
-0.120 -0.70 80 0C = 176 o F *
M -0.115 -0.65 1000C = 212 o F *
H -0.110 -0.60 1200C = 248 o F
SH -0.105 -0.55 150 0C = 302 o F
UH -0.100 -0.55 180 0C = 356 o F
EH -0.095 -0.50 200 0C = 392 o F
VH / AH -0.090 -0.49 230 0C = 446 o F
* Please note that N52, N50, and N50M are rated to a maximum of 60°C
(140°F).
Coatings Available
NdFeB should always be given a
protective coating to minimise
corrosion risk. There are currently
over 40 options for magnet finish.
Nickel Copper Nickel (NiCuNi) is the
standard (default) coating. This
NiCuNi coating is applied unless otherwise requested.
A Zinc (Zn) coating is sometimes used as an alternative to NiCuNi - it is not a
shiny as the Nickel finish and is not as good on corrosion resistance.
Nickel Copper Nickel plus Epoxy provides a double coating with improved
corrosion resisting properties.
Gold and Silver plating is actually a Gold or Silver layer on top of standard
NiCuNi. Black nickel finish is a dull grey/black colour.
Undamaged coatings will prolong magnet lifetime but only if the magnets
are used in good environmental conditions (e.g. warm, dry, no humidity). It
is impossible to guarantee that NdFeB magnets will be free from long term
corrosion. For such requirements consider plated SmCo magnets and all
Ferrite magnets.
When using glue you are bonding onto the plating or coating rather than
the material itself. If the plating or coating fails, the magnet may become
free to move. Methods next to resolve this problem.
Nickel-Copper-
Nickel (Ni-Cu-
Ni) [standard
coating]
Everlube
(6102G)
Nickel (Ni) Zinc (Zn)
Nickel-Copper plus
Black Nickel
White Zinc Black Zinc Epoxy (Black)
Epoxy (Grey) Copper (NiCu) Copper (NiCuNiCu) Tin (Sn)
Gold (Au) [this is
actually NiCuNi plus
Gold]
Ni-Cu-Ni plus
Rubber
Zn plus Rubber Zinc Chromate
Silver (Ag) [this is
actually NiCuNi plus
Silver]
Parylene C Ni-Cu-Ni plus
Parylene C
Ni-Cu-Ni-Au-
ParyleneC
Phosphate Pas-
sivation
PTFE ("Teflon®")
in white
PTFE ("Teflon®") in
silvery
PTFE ("Teflon®")
in grey
PTFE ("Teflon®")
in black
Titanium (Ti) Titanium Nitride
(TiN)
Chrome (bright/
standard)
Chrome (black) Ni-Cu-Ni plus
Everlube
Ni-Cu-Ni plus Epoxy Ni-Cu-Ni plus PTFE
Zn plus Everlube Tin (Sn) plus
Parylene C
Rhodium Potted (various)
Coloured (red,
green, blue, pink,
purple, etc)
Paint (various) Ni-Cu-Epoxy Adhesives/silicone
silicone sealed (as-
sembly)
Uncoated (bare –
recommend vacuum
packing as well)
Plastic encased (this fits around pre-coated magnets to give
additional protection and is not hermetic)
Other coatings may be possible - please let us know your requirements.
European Standard (IEC 60404-8-1) - not com-
monly used -Minimum Values
Material
Group
code
Br Hc (Hcb) Hci (Hcj) BHmax
mT kG kA/m kOe kA/m kOe KJ/m 3 MGOe
170/190 R7-1-1 980 9800 700 8795 1900 23875 170 21.4
210/130 R7-1-2 1060 10600 790 9925 1300 16335 210 26.4
250/120 R7-1-3 1130 11300 840 10555 1200 15080 250 31.4
290/80 R7-1-4 1230 12300 700 8795 800 10055 290 36.4
200/190 R7-1-5 1060 10600 760 9550 1900 23875 200 25.1
240/180 R7-1-6 1160 11600 840 10555 1800 22620 240 30.2
280/120 R7-1-7 1240 12400 900 11310 1200 15080 280 35.2
320/88 R7-1-8 1310 13100 800 10055 880 11060 320 40.2
210/240 R7-1-9 1060 10600 760 9550 2400 30160 210 26.4
240/200 R7-1-10 1160 11600 840 10555 2000 25130 240 30.2
310/130 R7-1-11 1300 13000 900 11310 1300 16335 310 39.0
250/240 R7-1-12 1200 12000 830 10430 2400 30160 250 31.4
260/200 R7-1-13 1210 12100 840 10555 2000 25130 260 32.7
340/130 R7-1-14 1330 13300 920 11560 1300 16335 340 42.7
360/90 R7-1-15 1350 13500 800 10055 900 11310 360 45.2
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Relative Coating Performance - Examples
(your application and its environmental condition may give
different results)
PLATING APPLIED
6 commonly coating
examples given
(other coatings exist)
Overall Thickness
(1 micron = 1/1000th mm)
(1 micron = 0.03937 mil)
(1 inch = 1000 mil)
Pressure Cooker Test (PCT)
Test is:- 2 bar, 120°C and 100%
RH (hours until corrosion could
start to be noted)
Salt Spray Test
Test is:- 5% NaCl solution at 35°C
(hours until corrosion could start
to be noted)
Nickel Copper Nickel (NiCuNi) 15-21 microns 48 hours 24 hours
NiCu + Black Nickel 15-21 microns 48 hours 24 hours
NiCuNi + Black Epoxy 20-28 microns 72 hours 48 hours
NiCuNi + Gold 16-23 microns 72 hours 36 hours
NiCuNi + Silver 16-23 microns 48 hours 24 hours
Zinc 7-15 microns 24 hours 12 hours
Physical Characteristics (Typical)
Characteristic Symbol Unit Value
Density D g/cm 7.5
Vickers Hardness Hv D.P.N 570
Compression Strength C.S N/mm 2 780
Coefficient of Thermal Expansion C// 10 -6 /°C 3.4
CŁ 10 -6 /°C -4.8
Electrical Resistivity ƿ µ Ω.cm 150
Temperature coefficient of resistivity α 10 -4 /°C 2
Electrical Conductivity σ 10 6 S/m 0.667
Thermal Conductivity k kCal/(m.h.°C) 7.7
Specific Heat Capacity c kCal/(kg.°C) 0.12
Tensile Strength σ UTS , or S U kg/mm 2 8
Young's Modulus λ / E 1011N/m 2 1.6
Flexural Strength β 10-12m 2 /N 9.8
Compressibility σ 10-12m 2 /N 9.8
Rigidity E.I N/m 2 0.64
Poisson's Ratio ν 0.24
Curie Temperature Tc °C 310
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Additional Information
The magnet shape, its environment, and the actual application affect how
the NdFeB magnet will perform. Temperature is important as well as damp or
wet conditions.
When determining suitability, you should analyse the Intrinsic curve not the
Normal curve.
By keeping the intrinsic working point above the ‘knee’ and ideally at the
BHmax working point maximum performance is possible.
Dimensional Tolerances
The standard NdFeB magnet tolerance is +/-0.1mm. It is possible to produce
most shapes to +/-0.05m tolerances but the magnet may cost more.
For tighter tolerances we would have to review the shape to inform
you of the tolerances we could achieve (most applications +/-0.05mm is the
best). The shape and finish determines the tolerances that can be achieved.
Please contact us for a free and without obligation quotation.
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-25
-24
-23
-22
-21
-20
-19
-18
-17
-16
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-13
-12
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-10
-9
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-7
-6
-5
-4
-3
-2
-1
0
Induced Field (Flux Density), B (kGauss)
Applied Field (Demagnetising Field), H (kOe)
NdFeB - N42 grade
-40°C Intrinsic
-40°C Normal
+20°C Intrinsic
+20°C Normal
+60°C Intrinsic
+60°C Normal
+80°C Intrinsic
+80°C Normal
+100°C Intrinsic
+100°C Normal
Pc=B/H=1 Pci=Pc+1=2
Conversions:-
1kA/m=12.5665Oe, 1kOe=79.5775kA/m
1T=10kGauss, 1 Gauss=0.1mT
Minimum Values (at 20°C):-
Br=12.8kGauss (1.28T)
Hc=11.6kOe (923kA/m)
Hci=12.0kOe (955kA/m)
BHmax=40MGOe (318kJ/m3)
+80°C max working temp
Example BH curve shown
Br
Hci Hc
'Knee'
Intrinsic working point
Normal working point
Hd
Bdi
Bd (kG) x Hd (kOe) =
Energy Product
(MGOe) at that
working point
Bd
If you have any more questions, require technical assistance and would like a quotation, simply contact us.
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