Sintered Neodymium Magnets also referred to as Neodymium magnets, Neo or NIB magnets (because of their Neodymium, Iron and Boron composition) stand out as the most powerful permanent magnets in the world. Neo magnets belong to the rare earth magnet family. They are relatively new and have only become affordable for daily use recently.

Grading

Neodymium magnets are graded depending on the material that makes them i.e. N35, N38, N38SH, N42, etc…As a general rule of thumb, the higher the grade i.e. the number following the letter ‘N’, the stronger the magnet. The strongest Neodymium magnet (or simply the highest grade Neo magnet) available in the market today is the N52. Any letter or letters that follow the grade i.e. SH in N38SH represent the temperature rating of the magnet. In case there’s no letter or letters following the grade, the magnet is said to be a standard temperature neodymium magnet. Neo magnets have standard temperature ratings (no designation). The ratings include; M, H, SH, UH, EH. Please note you can find all the temperature ratings of each Neodymium magnet grade we sell on our Neodymium magnets specifications page.

Composition and Coating

Neodymium magnets are composed mostly of Neodymium as well as Iron and Boron. Since the magnets contain Iron, they are prone to rust. As a result, it’s important to coat Neo magnets to prevent rusting. Coating also helps to strengthen the magnets. There are a number of coating options for Neo magnets. Nickel is however the most popular coating material for Neo magnets. We however go a step further and give our Neo magnets a triple plating with layers of nickel and copper and then we apply a nickel coating again. The triple coating ensures our NIB magnets last longer (are more durable) than most (if not all) Neo magnets out there in the market today. It’s important to note that most Neo magnets on sale today are single plated. Our Neo magnets are therefore the best in regards to durability. It’s also worth noting that we offer numerous coating options apart from nickel coating. For instance, you can request for a zinc, copper, tin, epoxy, silver or even a gold coating. Our gold plated NIB magnets are quadruple plated with; nickel, copper, then nickel again before they are given a top gold coating.

Main advantages

1. Higher resistance to demagnetization: NIB magnets have a higher demagnetization resistance when compared to many other types of magnets. Although they are sensitive to heat, they don’t become demagnetized easily when they are placed near other magnets or dropped, as is the case with most magnets.
2. Unmatched strength: As mentioned above, Neodymium are the most powerful permanent magnets in the world. The magnets are ten times stronger than the strongest (ceramic) magnets. If you happen to be using ceramic magnets currently in your project, you can (should) replace them with smaller Neo magnets for a much stronger holding force. Feel free to check out our Magnet summary page to get an idea of the strength of each of our Neo magnets.
Our Magnet summary page also shows other important info such as the surface field of all the magnets we stock. You also get access to an online magnet calculator which can help you estimate the field strength as well as pull force of magnets placed any distance from Neo magnet.
3. Reasonable cost: Our Neodymium magnets are reasonably priced when you consider their amazing properties i.e. superior magnetic properties and higher resistance to demagnetization.
4. Numerous applications: Neodymium magnets have extensive applications in many industries/fields such as computer devices, motors, communication tools, medical treatment instruments, speakers, sensors etc.

Main disadvantages

1. Neodymium is a brittle material: Neodymium magnets are prone to chips and cracks. We solve this problem by coating the magnets.
2. NIB magnets are also prone to rust. Coating also helps in this case.
3. Machining Neodymium magnets generates heat which is capable of demagnetizing the magnets or igniting the material which is highly toxic when burned. It’s therefore important to control the heat the magnet is exposed to in any application involving NIB magnets or avoid machining at all. NIB magnets start losing their strength when they are exposed to heat exceeding 80C or 176F (for standard N-grades). They become completely demagnetized at temperatures above 310C or 590F (for standard N-grades).

Typical Magnetic Properties of Neodymium Magnet
GradeResidual Induction
(Br)
Coercive Force
(Hcb)
Intrinsic Coercive
Force
(Hcj)
Max Energy
Product
(BH)max
Temp.
Coefficient
Tk
Max   Working Temp.Curie Temp.
TkGskA/mkOekA/mkOekJ/m3MGOe%/˚C
(Br)
%/˚C  (Hcj)˚C˚C
N35-A10.99-1.059.9-10.5≥730≥9.2≥780≥9.8176-20022-25-0.12-0.7060310
N35-A21.05-1.0810.5-10.8≥780≥9.8≥859≥10.5200-21625-27-0.12-0.7060310
N351.17-1.2211.7-12.2≥868≥10.9≥955≥12263-28733-36-0.12-0.7080310
N381.22-1.2512.2-12.5≥899≥11.3≥955≥12287-31036-39-0.12-0.7080310
N401.25-1.2812.5-12.8≥907≥11.4≥955≥12302-32638-41-0.12-0.7080310
N421.28-1.3212.8-13.2≥915≥11.5≥955≥12318-34240-43-0.12-0.7080310
N451.32-1.3813.2-13.8≥923≥11.6≥955≥12342-36643-46-0.12-0.7080310
N481.38-1.4213.8-14.2≥923≥11.6≥955≥12366-39046-49-0.12-0.7080310
N501.40-1.4514.0-14.5≥796≥10.0≥876≥11382-40648-51-0.12-0.7060310
N521.43-1.4814.3-14.8≥796≥10.0≥876≥11398-42250-53-0.12-0.7060310
N551.46-1.5214.6-15.2≥796≥10.0≥876≥11414-43052-54-0.12-0.7060310
N35M1.17-1.2211.7-12.2≥868≥10.9≥1114≥14263-28733-36-0.12-0.70100310
N38M1.22-1.2512.2-12.5≥899≥11.3≥1114≥14287-31036-39-0.12-0.70100310
N40M1.25-1.2812.5-12.8≥923≥11.6≥1114≥14302-32638-41-0.12-0.70100310
N42M1.28-1.3212.8-13.2≥955≥12.0≥1114≥14318-34240-43-0.12-0.70100310
N45M1.32-1.3813.2-13.8≥995≥12.5≥1114≥14342-36643-46-0.12-0.70100310
N48M1.37-1.4313.7-14.3≥1027≥12.9≥1114≥14366-39046-49-0.12-0.70100310
N50M1.40-1.4514.0-14.5≥1033≥13≥1114≥14382-40648-51-0.12-0.70100310
N52M1.43-1.4814.3-14.8≥1050≥13.2≥1114≥14398-42250-53-0.12-0.70100310
N55M1.46-1.5214.6-15.2≥1066≥13.4≥1114≥14414-43052-54-0.12-0.70100310
N35H1.17-1.2211.7-12.2≥868≥10.9≥1353≥17263-28733-36-0.12-0.70120310
N38H1.22-1.2512.2-12.5≥899≥11.3≥1353≥17287-31036-39-0.12-0.70120310
N40H1.25-1.2812.5-12.8≥923≥11.6≥1353≥17302-32638-41-0.12-0.70120310
N42H1.28-1.3212.8-13.2≥955≥12.0≥1353≥17318-34240-43-0.12-0.70120310
N45H1.32-1.3613.2-13.6≥963≥12.1≥1353≥17342-36643-46-0.12-0.70120310
N48H1.37-1.4313.7-14.3≥995≥12.5≥1353≥17366-39046-49-0.12-0.70120310
N50H1.40-1.4514.0-14.5≥1011≥12.7≥1353≥17382-40648-51-0.12-0.70120310
N52H1.43-1.4814.3-14.8≥1027≥12.9≥1353≥17398-42250-53-0.12-0.70120310
N55H1.46-1.5214.6-15.2≥1035≥13≥1353≥17414-43052-54-0.12-0.70120310
N35SH1.17-1.2211.7-12.2≥876≥11.0≥1592≥20263-28733-36-0.11-0.65150320
N38SH1.22-1.2512.2-12.5≥907≥11.4≥1592≥20287-31036-39-0.11-0.65150320
N40SH1.25-1.2812.5-12.8≥939≥11.8≥1592≥20302-32638-41-0.11-0.65150320
N42SH1.28-1.3212.8-13.2≥987≥12.4≥1592≥20318-34240-43-0.11-0.65150320
N45SH1.32-1.3813.2-13.8≥1003≥12.6≥1592≥20342-36643-46-0.11-0.65150320
N48SH1.37-1.4313.7-14.3≥1027≥12.9≥1592≥20366-39046-49-0.11-0.65150320
N28UH1.04-1.0810.4-10.8≥764≥9.6≥1990≥25207-23126-29-0.11-0.60180330
N30UH1.08-1.1310.8-11.3≥812≥10.2≥1990≥25223-24728-31-0.11-0.60180330
N33UH1.13-1.1711.3-11.7≥852≥10.7≥1990≥25247-27131-34-0.11-0.60180330
N35UH1.17-1.2211.7-12.2≥860≥10.8≥1990≥25263-28733-36-0.11-0.60180330
N38UH1.22-1.2512.2-12.5≥876≥11.0≥1990≥25287-31036-39-0.11-0.60180330
N40UH1.25-1.2812.5-12.8≥899≥11.3≥1990≥25302-32638-41-0.11-0.60180330
N42UH1.28-1.3212.8-13.2≥899≥11.3≥1990≥25318-34240-43-0.11-0.60180330
N45UH1.32-1.3613.2-13.6≥908≥11.4≥1990≥25342-36643-46-0.11-0.60180330
N48UH1.37-1.4313.7-14.3≥908≥11.4≥1990≥25366-39046-49-0.11-0.60180330
N28EH1.04-1.0810.4-10.8≥780≥9.8≥2388≥30207-23126-29-0.11-0.55200330
N30EH1.08-1.1310.8-11.3≥812≥10.2≥2388≥30223-24728-31-0.11-0.55200330
N33EH1.13-1.1711.3-11.7≥836≥10.5≥2388≥30247-27131-34-0.11-0.55200330
N35EH1.17-1.2211.7-12.2≥876≥11.0≥2388≥30263-28733-36-0.11-0.55200330
N38EH1.22-1.2512.2-12.5≥899≥11.3≥2388≥30287-31036-39-0.11-0.55200330
N40EH1.25-1.2812.5-12.8≥899≥11.3≥2388≥30302-32638-41-0.11-0.55200330
N42EH1.28-1.3212.8-13.2≥899≥11.3≥2388≥30318-34240-43-0.11-0.55200330
N45EH1.32-1.3613.2-13.6≥899≥11.3≥2388≥30342-36643-46-0.11-0.55200330
N48EH1.37-1.4313.7-14.3≥899≥11.3≥2388≥30366-39046-49-0.11-0.55200330
N28AH1.04-1.0810.4-10.8≥787≥9.9≥2624≥33207-23126-29-0.10-0.50230350
N30AH1.08-1.1310.8-11.3≥819≥10.3≥2624≥33223-24728-31-0.10-0.50230350
N33AH1.13-1.1711.3-11.7≥843≥10.6≥2624≥33247-27131-34-0.10-0.50230350
N35AH1.17-1.2211.7-12.2≥876≥11.0≥2624≥33263-28733-36-0.10-0.50230350
N38AH1.22-1.2512.2-12.5≥899≥11.3≥2624≥33287-31036-39-0.10-0.50230350

Remark :

  • The above mentioned data of magnetic and physical characteristics are given at room temperature.
  • The density : 7.4-~7.6 g/cm2
  • The conversion table: 1T = 10KGs ; 1KA/m=79.6Koe ; 1KJ/m3=7.96MGOe
Physical properties at room temperature(20)℃
Density7.4-7.7g/cm3
Vickers Hardness600-620HV
Bending strength250-450MPa
Compressive strength1000-1200Mpa
Tensile strength┴C Axis 300 -350MPa
‖C Axis 200-220MPa
Impact strength2-10KJ/m2
Fracture toughness5Mpam1/2
Young’s modulus150-160GPa
Thermal conductivity5-6W·m-1·K-1
Special heat(TYP)0.44J·g-1·K-1
Electrical resistivity(TYP)1.25Ω·mm2/m

Block

Size Range (mm)Tolerance (mm)Parallelism (mm)Verticality (mm)
L,W,H≤10±0.030.03≤0.5
10<L,W,H≤30±0.050.05
30<L,W,H≤50±0.080.08
50<L,W,H≤60±0.150.1
L,W,H≤80±0.200.15≤0.6

Segment

ItemSize(mm)Tolerance(mm)
ThicknessT≤5±0.04
5<T≤15±0.05
15<T≤30±0.07
30<T≤50±0.10
50<T≤60±0.15
 LengthL≤10±0.04
10<L≤50±0.05
50<L≤70±0.10
70<L≤80±0.15
L<80±0.20
Chord WidthW≤5±0.04Control based Angle
5<W≤30±0.05
30<W≤50±0.10
50<W≤70±0.15
W≤80±0.2

Ring

ID(mm)Tolerance (mm)Concentricity (mm)
d≤5±0.040.06
5<d≤30±0.050.1
30<d≤50±0.100.15

Cylinder, Disc

Size (mm)Tolerance(mm)Parallelism(mm)Flatness(mm)
D≤10,H≤10±0.030.030.05
10<D≤40,10<H≤30±0.050.050.08
40<D≤85,30<H≤40±0.100.10.1
H≤60±0.150.150.15

Note: Welcome you contact us for special precision product.

Magnet Plating & Coating

Coating sortsCoating CodeColorTypical plating thickness
(μm)
Comparison of surface plating protection abilityWorking temperature
(℃)
SSTDamp heat testPCT test
Ni Barrel platingNiBright Silver10-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆≤200
Ni Rack platingNiBright Silver10-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆
Zn /Blue-White Zn Barrel platingZnBlue-White5-10☆☆☆☆☆☆☆☆☆☆≤160
Zn /Blue-White Zn Rack platingZnBlue-White5-10☆☆☆☆☆☆☆☆☆
3+Cr Color Zn Barrel platingColor ZnBright Color5-10☆☆☆☆☆☆☆☆☆
3+Cr Color Zn Rack platingColor ZnBright Color5-10☆☆☆☆☆☆☆☆☆
Ni+Chemical Ni Barrel PlatingNi+Chemical NiDark Silver12-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆≤200
Ni+Chemical Ni Rack PlatingNi+Chemical NiDark Silver12-20☆☆☆☆☆☆☆☆☆☆☆☆☆
Ni+CrNi+CrDark Black12-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆≤200
TeflonTeflonBlack Gray☆☆☆☆☆☆☆☆☆≤200
Ni+Black NiNi+Black NiBlack12-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆
Ni+SnNi+SnBright Silver12-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆
Ni+AgNi+AgSilver12-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆
Ni+AuNi+AuGolden10-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆
EpoxyEPOXYBlack10-20☆☆☆☆☆☆☆☆☆☆☆☆☆☆≤130
(Ni/Ni+Cu) +EpoxyNiCuNi/NiCu+EPOXYBlack15-25☆☆☆☆☆☆☆☆☆☆☆☆☆≤120
Phosphoric/PassivationPhosphoric/PassivationBlack Grey1-3≤240
Nano CoatingNano coatingBright Grey20-30☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆≤350

Note

1.Corrosion-resistant in Salt Fog:35±2℃,5%NaCl,PH=6.5-7.2,Salt spray sinking 1.5ml/Hr.
2.PCT:120±3℃,2-2.4atm, distilled water PH=6.7-7.2 , 100%RH.
Special requirement for the coating please contact us directily.

N54

N54

N50UH

N50UH

N45EH

N45EH

N42AH

N42AH

N38VH

N38VH

N38AH

N38AH

LECMAG’s Sintered Neodymium Magnets (NdFeB) Display

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