NdFeb (Neodymium Iron Boron) Info

Sintered neodymium iron boron (NdFeB) magnets are the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 24 MGOe to 55 MGOe. It has a combination of very high remanence and coercivity, and comes with a wide range of grades, sizes and shapes. With its excellent magnetic characteristics, abundant raw material and relatively low prices, NdFeB offers more flexibility in designing of new magnets or replacing the traditional magnetic materials such as ceramic, Alnico and SmCo to achieve high efficiency, low cost and more compact devices.

Cylinder with Side Hole
Cylinder with
Side Hole

Open Side Thin Wall Cylinder
Open Side Thin
Wall Cylinder

NdFeB Cylinder with+/-.0002 ID
NdFeB Cylinder
with+/-.0002 ID

Skewed Arc NdFeB Magnet
Skewed Arc
NdFeB Magnet

.012
.012″ Dia x1.25″
Slender NdFeB Rod

A powder metallurgy process is used in producing sintered NdFeB magnets. Although sintered NdFeB is mechanically stronger than SmCo magnets and less brittle than other magnets, it should not be used as structural component. Selection of NdFeB is limited by temperature due to its irreversible loss and moderately high reversible temperature coefficient of B r and H ci. The maximum application temperature is 200 °C for high coercivity grades. Its actual performance at that temperature is governed strongly by the design

Of the magnetic circuit. NdFeB magnets are more prone to oxidation than any other magnet alloys. If NdFeB magnet is to be exposed to humidity, chemically aggressive media such as acids, alkaline solutions, salts and harmful gases, coating is recommended. It is not recommended in a hydrogen atmosphere.

NdFeB and SmCo are collectively known as Rare Earth magnets because they are both composed of materials from the Rare Earth group of elements. Neodymium Iron Boron (general composition Nd 2Fe 14B, often abbreviated to NdFeB) is the most recent commercial addition to the family of modern magnet materials. At room temperatures, NdFeB magnets exhibit the highest magnetic properties of all magnet materials.

Spec of NdFeB

MAGNETIC CHARACTERISTICS AND PHYSICAL PROPERTIES OF SINTERED NEODYMIUM IRON BORON

Type of MagnetRemanenceCoercivityIntrinsic CoercivityMaximum Energy ProductMaximum Working Temperature at L/D>=0.70
ReferenceBr mTHc KA/mHci KA/m(BH)max KJ/m3Tw
Designation(KG)(KOe)(KOe)(MGOe)C°
N30/121080-1130≥796≥955223-24780
(10.8-11.3)(≥10.0)(≥12)(28-31)
N33/121130-1180≥836≥955247-27180
(11.3-11.8)(≥10.5)(≥12)(31-34)
N35/121180-1220≥868≥955263-28780
(11.8-12.2)(≥10.9)(≥12)(33-36)
N38/121220-1260≥899≥955287-31180
(12.2-12.6)(≥11.3)(≥12)(36-39)
N40/121260-1290≥907≥955302-32780
(12.6-12.9)(≥11.4)(≥12)(38-41)
N42/121290-1330≥915≥955318-34280
(12.9-13.3)(≥11.5)(≥12)(40-43)
N45/121330-1370≥915≥955342-36680
(13.3-13.7)(≥11.5)(≥12)(43-46)
N48/121370-1410≥876≥955358-39080
(13.7-14.1)(≥11.0)(≥12)(45-49)
N50/121400-1450≥876≥955374-40680
(14.0-14.5)(≥11.0)(≥12.0)(47-51)
N50+/121400-1450≥930≥995374-40680
(14.0-14.5)(≥11.7)(≥12.5)(47-51)
N52/111430-1480≥868≥876390-42270
(14.3-14.8)(≥10.9)(≥11.0)(49-53)
N55/111460-1520≥836≥876438-40670
(14.6-15.2)(≥10.5)(≥11.0)(51-55)
N30/14  (M)1080-1130≥796≥1114223-247100
(10.8-11.3)(≥10.0)(≥14)(28-31)
N33/14  (M)1130-1180≥836≥1114247-271100
(11.3-11.8)(≥10.5)(≥14)(31-34)
N35/14  (M)1180-1220≥868≥1114263-287100
(11.8-12.2)(≥10.9)(≥14)(33-36)
N38/14  (M)1220-1260≥899≥1114287-311100
(12.2-12.6)(≥11.3)(≥14)(36-39)
N40/14  (M)1260-1290≥923≥1114302-327100
(12.6-12.9)(≥11.6)(≥14)(38-41)
N42/14  (M)1290-1330≥955≥1114318-342100
(12.9-13.3)(≥12.0)(≥14)(40-43)
N45/14  (M)1330-1370≥995≥1114342-366100
(13.3-13.7)(≥12.5)(≥14)(43-46)
Type of MagnetRemanenceCoercivityIntrinsic CoercivityMaximum Energy ProductMaximum Working Temperature at L/D>=0.70
ReferenceBr mTHc KA/mHci KA/m(BH)max KJ/m3Tw
Designation(KG)(KOe)(KOe)(MGOe)C°
N45+/16  (M)1330-1370≥995≥1114342-366100
(13.3-13.7)(≥12.5)(≥16)(43-46)
N48/14  (M)1370-1410≥1027≥1273358-390100
(13.7-14.1)(≥12.9)(≥14)(45-49)
N50/14  (M)1400-1450≥1043≥1114374-406100
(14.0-14.5)(≥13.1)(≥14)(47-51)
N52/14  (M)1420-1470≥1027≥1114390-422100
(14.2-14.7)(≥12.9)(≥14)(49-53)
N54/14  (M)1470-1520≥995≥1114406-438100
(14.7-15.2)(≥12.5)(≥14)(51-55)
N30/17  (H)1008-1130≥796≥1353223-247120
(10.8-11.3)(≥10.0)(≥17.0)(28-31)
N33/17  (H)1130-1180≥836≥1353247-271120
(11.3-11.8)(≥10.5)(≥17.0)(31-34)
N35/17  (H)1180-1220≥868≥1353263-287120
(11.8-12.2)(≥10.9)(≥17.0)(33-36)
N38/17  (H)1220-1260≥899≥1353287-311120
(12.2-12.6)(≥11.3)(≥17.0)(36-39)
N40/17  (H)1260-1290≥923≥1353302-327120
(12.6-12.9)(≥11.6)(≥17)(38-41)
N42/17  (H)1290-1330≥955≥1353318-342120
(12.9-13.3)(≥12.0)(≥17)(40-43)
N45/17  (H)1330-1370≥995≥1353342-366120
(13.3-13.7)(≥12.5)(≥17)(43-46)
N48/17  (H)1370-1410≥1027≥1353366-390120
(13.7-14.1)(≥12.9)(≥17)(46-49)
N50/17  (H)1400-1450≥1027≥1353374-406120
(14.0-14.5)(≥13.0)(≥17)(47-51)
N52/17  (H)1420-1470≥1074≥1353390-422120
(14.2-14.7)(≥13.5)(≥17)(49-53)
N30/20  (SH)1080-1140≥804≥1592223-247150
(10.8-11.4)(≥10.1)(≥20)(28-31)
N33/20  (SH)1140-1180≥844≥1592247-271150
(11.4-11.8)(≥10.6)(≥20)(31-34)
N35/20  (SH)1180-1220≥876≥1592263-287150
(11.8-12.2)(≥11.0)(≥20)(33-36)
N38/20  (SH)1220-1260≥907≥1592287-310150
(12.2-12.6)(≥11.4)(≥20)(36-39)
N40/20  (SH)1260-1290≥923≥1592302-326150
(12.4-12.8)(≥11.6)(≥20)(38-41)
Type of MagnetRemanenceCoercivityIntrinsic CoercivityMaximum Energy ProductMaximum Working Temperature at L/D>=0.70
ReferenceBr mTHc KA/mHci KA/m(BH)max KJ/m3Tw
Designation(KG)(KOe)(KOe)(MGOe)C°
N48/20  (SH)1370-1410≥1027≥1592366-390150
(13.7-14.1)(≥12.9)(≥20)(46-49)
N50/20  (SH)1400-1450≥1034≥1592374-604150
(14.0-14.5)(≥13.0)(≥20)(47-51)
N52/20  (SH)1420-1470≥1074≥1592390-422150
(14.2-14.7)(≥13.5)(≥20)(49-53)
N28/25  (UH)1080-1140≥764≥1990207-231180
(10.4-10.8)(≥9.6)(≥25)23-29
N30/25  (UH)1080-1140≥804≥1990223-247180
(10.8-11.4)(≥10.1)(≥25)(28-31)
N33/25  (UH)1140-1180≥852≥1990247-271180
(11.4-11.8)(≥10.7)(≥25)(31-34)
N35/25  (UH)1180-1220≥860≥1990263-287180
(11.8-12.2)(≥10.8)(≥25)(33-36)
N38/25  (UH)1220-1260≥899≥1990287-311180
(12.2-12.6)(≥11.3)(≥25)(36-39)
N40/25  (UH)1250-1290≥899≥1990302-326180
(12.5-12.9)(≥11.3)(≥25)(38-41)
N42/25  (UH)1280-1330≥923≥1990318-342180
(12.8-13.3)(≥11.6)(≥25)(42-43)
N45/25  (UH)1320-1370≥995≥1990334-366180
(13.2-13.7)(≥12.5)(≥25)(42-46)
N28/30  (EH)1040-1080≥780≥2388207-231200
(10.4-10.8)(≥9.8)(≥30)(26-29)
N30/30  (EH)1080-1140≥804≥2388223-247200
(10.8-11.4)(≥10.1)(≥30)(28-31)
N33/30  (EH)1140-1180≥820≥2388247-271200
(11.4-11.8)(≥10.3)(≥30)(31-34)
N35/30  (EH)1180-1220≥836≥2388263-287200
(11.8-12.2)(≥10.5)(≥30)(33-36)
N38/30  (EH)1220-1260≥899≥2388278-311200
(12.2-12.6)(≥11.3)(≥30)(35-39)
N40/30  (EH)1250-1290≥899≥2388302-326200
(12.5-12.9)(≥11.3)(≥30)(38-41)
N42/30  (EH)1280-1330≥923≥2388318-342200
(12.8-13.3)(≥11.6)(≥30)(40-43)
N45/30  (EH)1320-1370≥995≥2388334-366200
(13.2-13.7)(≥12.5)(≥30)(42-46)
N28/35  (AH)1040-1090≥780≥2388207-231230
(10.4-10.9)(≥9.8)(≥35)(26-29)
Type of MagnetRemanenceCoercivityIntrinsic CoercivityMaximum Energy ProductMaximum Working Temperature at L/D>=0.70
ReferenceBr mTHc KA/mHci KA/m(BH)max KJ/m3Tw
Designation(KG)(KOe)(KOe)(MGOe)C°
N30/35  (AH)1080-1130≥804≥2388223-247230
(10.8-11.3)(≥10.1)(≥35)(28-31)
N33/35  (AH)1130-1180≥820≥2388247-271230
(11.3-11.8)(≥10.3)(≥35)(31-34)
N35/35  (AH)1180-1220≥836≥2388263-287230
(11.8-12.2)(≥10.5)(≥35)(33-36)
N38/35  (AH)1220-1260≥899≥2388278-311230
(12.2-12.6)(≥11.3)(≥35)(35-39)

Remarks:

  • The above-mentioned data of magnetic parameters and physical properties are given at room temperature.
  • The maximum service temperature of the magnet is changeable due to the ratio length and diameter and environmental factors.
  • If the magnet you are looking for is not listed here or is higher than the listed, please contact our application engineer to discuss your applications via sales@ppactech.com or call 949-459-8811. 

Magnetic Characteristic Parameters

Item/GradeTemperature Coefficient ％/℃ （20℃～150℃） Weight loss
mg/cm2
αBrβHcJ
Normal grade －（0.11～0.12） －（0.58～0.70） －（0.46～0.59）
“T”Grade 1） －（0.11～0.12） －（0.46～0.59）≤15
“L”Grade 2） －（0.11～0.12） －（0.55～0.65）≤5
“TL”Grade 3） －（0.095～0.115） －（0.46～0.59）≤5

Note:-

  1. “T” grade series products have lower temperature coefficient, compared with ordinary grade, better temperature resistance, suitable for H grade and above grade, such as 45HT, 35SHT, 38UHT;
  2. “L” grade series products have low weight loss performance, compared with the ordinary grade, usually adopts special formula and process, less weight loss, the above weightlessness standard test conditions are 121℃ 2atm above 95% humidity, lasting 168h;
  3. The “TL” grade has the performance of both “T” and “L” grade products.

Typical Mechanical Properties

ParameterUnitValue
Vickers hardness Hv≥550
Density g/cm3≥7.40
RecalPenmeability ＼1.05
Curie point ℃312～380
Specific resistance μΩ·cm150
Bending strength MPa250
Compressive strength MPa1000～1100
Thermal expansion ℃－1
 - (1～3)×10－6K
(⊥)
Thermal expansion ℃－1
(3～4)×10－6K
(∥)