Sintered Neodymium

The most powerful permanent magnets available.

Highest strength magnets for any application.

Sintered Neodymium

EAM Sintered Neodymium Magnets — Real Power…

Sintered neodymium iron-boron (NdFeB) magnets are the most powerful commercially available magnets in the world. With energy products typically between 33 and 52 MGOe, they are the perfect solution to a host of magnetic applications demanding very strong, highly coercive magnets that are available in large quantities at a relatively low cost.

Due to their impressive properties, their small size relative to their strength, NdFeB magnets are increasingly replacing those made from older materials such as ceramic and alnico, as well as other rare-earth materials such as samarium cobalt.

Keep in mind: NdFeB magnets contain iron and are very susceptible to corrosion. If they are to be exposed to moisture or corrosive elements of any kind, coating or plating is highly recommended. NdFeB magnets exhibit moderate mechanical properties, and are not excessively brittle, however they will crack or chip if dropped or allowed to snap together carelessly.

 

History of Neodymium Magnets:

The Neodymium-Iron-Boron magnetic compound (NdFeB) was discovered in 1982 by both General Motors and the Sumitomo Corporation.  Their research had been motivated by a desire to find a replacement for Samarium Cobalt magnets which were becoming prohibitively expensive.  GM focused on the “melt-spun” type of neodymium compounds for bonded magnets, while Sumitomo worked on developing fully-dense sintered neodymium magnet materials.

Sumitomo was eventually merged with Hitachi Corporation, created more than 600 patents related to the production of neodymium magnets, and began licensing manufacturers around the world to produce neodymium magnets.

China controls most of the world’s rare-earth mines, and therefore most of the world’s rare-earth magnet production.  The US Department of Energy has begun funding research to find substitutes for rare-earth magnetic technology which is ongoing.

 

Uses for Neodymium Magnets

  • Head actuators for computer hard disks
  • Erase heads for cheap cassette recorders
  • Magnetic resonance imaging (MRI)
  • Mechanical e-cigarette firing switches
  • Locks for doors
  • Loudspeakers and headphones
  • Magnetic bearings and couplings
  • Benchtop NMR spectrometers
  • Electric motors:
    • Cordless tools
    • Servomotors
    • Lifting and compressor motors
    • Synchronous motors
    • Spindle and stepper motors
    • Electrical power steering
    • Drive motors for hybrid and electric vehicles
  • Actuators
  • Electric generators for wind turbines (only those with permanent magnet excitation)

Properties

Sintered Neodymium

Magnetic Material Characteristics

Material & Grade *Max Op Temp (C) Curie Temp (C) Br (Gauss) Hc (Oersted) Hci (Oersted) Bhmax MGOe
MAX MIN MAX MIN MAX MIN
Neo-38 80 310 13,000 12,300 12,000 12,000 40 36
Neo-40 80 310 13,200 12,600 12,000 12,000 42 38
Neo-42 80 310 13,500 13,000 11,000 11,000 44 40
Neo-45 80 310 13,800 13,200 11,000 11,000 46 42
Neo-48 80 310 14,300 13,700 11,000 11,000 49 45
Neo-50 80 310 14,600 14,000 11,000 11,000 51 47
Neo-35M 100 315 12,500 11,800 14,000 14,000 37 33
Neo-38M 100 315 13,000 12,300 14,000 14,000 40 36
Neo-40M 100 315 13,200 12,600 14,000 14,000 42 38
Neo-42M 100 315 13,500 13,000 14,000 14,000 44 41
Neo-45M 100 315 13,800 13,200 14,000 14,000 46 42
Neo-48M 100 315 14,300 13,700 14,000 14,000 49 45
Neo-35H 120 330 12,500 11,800 17,000 17,000 37 33
Neo-38H 120 330 13,000 12,300 17,000 17,000 40 36
Neo-41H 120 330 13,200 12,600 16,000 16,000 42 38
Neo-44H 120 330 13,700 13,000 16,000 16,000 45 41
Neo-46H 120 330 14,000 13,400 16,000 16,000 47 43
Neo-35SH 150 365 12,500 11,800 20,000 20,000 37 33
Neo-39SH 150 365 13,000 12,300 20,000 20,000 40 36
Neo-42SH 150 365 13,500 13,000 20,000 20,000 43 41
Neo-28UH 180 365 11,300 10,400 25,000 25,000 30 26
Neo-30UH 180 365 11,700 10,900 25,000 25,000 32 28
 Neo-33UH 180 365 12,200 11,400 25,000 25,000 36 31
 Neo-35UH 180 365 12,500 11,800 25,000 25,000 37 33
 Neo-30EH 200 365 11,700 10,900 30,000 30,000 32 28
 Neo-33EH 200 365 12,000 11,400 30,000 30,000 35 31

 

EAM-Neodymium-Properties.pdf

Charts & Data

Charts & Data

Neo 32UH

One

Neo 35

One

Neo 38H

One

Neo 40H

One

Neo 40SH

One

Neo 42M

One

Neo 45

One
One
One
One
One
One
One
One

EAM-Neodymium-Demagnetization-Curves.pdf

Photos

Photos

Case Studies

Case Studies

Controller For High-Tech Manufacturer Read more

Critical Pump Mechanism for Heart & Lung Machine Read more

Processing

PROCESS FLOW DIAGRAM compression Branding
goods inwards inspection
alloying
milling to find powder
goods inwards inspection
isostatic
uniaxial
sintering Protective Atmosphere
grinding
slicing
coating
inspection
Magnetization
packing and despatch

NdFeB – Processing Sintered Neodymium Magnets

Sintered neodymium iron-boron (NdFeB) magnets are the most powerful commercially available magnets in the world. With energy products typically between 33 and 52 MGOe, they are the perfect solution to a host of magnetic applications demanding very strong, highly coercive magnets that are available in large quantities at a relatively low cost.

Due to their impressive properties, their small size relative to their strength, NdFeB magnets are increasingly replacing those made from older materials such as ceramic and alnico, as well as other rare-earth materials such as samarium cobalt.

Keep in mind: NdFeB magnets contain iron and are very susceptible to corrosion. If they are to be exposed to moisture or corrosive elements of any kind, coating or plating is highly recommended. NdFeB magnets exhibit moderate mechanical properties, and are not excessively brittle, however they will crack or chip if dropped or allowed to snap together carelessly.

Browse Standard Parts

Sintered Neodymium

Standard Parts: MAGNETIC DISKS

Need a stock magnet for prototyping, design work, crafts or home projects?

We’ve made it easy to browse EAM’s standard parts and make purchases easily with a credit card. All orders ship direct from our NY or PA locations.

Just click to be redirected to EAM’s online magnet store:

Download this data in PDF format – EAM-Sintered-Neo-Std-Parts.pdf

EAM Part No.Outer Dia. (OD)ThickLift StrengthMGOeGradeMax Op. Temp. (C)FinishMachine- able?Impact Resistance
RE-00220.250"0.200"3.253535150°Nickel PlatedNoModerateBuy
RE-00350.375"0.100"43535150°Nickel PlatedNoModerateBuy
RE-01790.500"0.375"113535150°Nickel PlatedNoModerateBuy
RE-02331.00"0.250"183535150°Nickel PlatedNoModerateBuy
RE-03340.320"0.072"3.23535150°Nickel PlatedNoModerateQuote
RE-04550.250"0.125"33235150°Nickel PlatedNoModerateBuy
RE-04560.250"0.250"3.53535150°Nickel PlatedNoModerateBuy
RE-04570.125"0.125"0.633535150°Nickel PlatedNoModerateBuy
RE-04580.500"0.250"73535150°Nickel PlatedNoModerateQuote
RE-04590.500"0.190"5.723535150°Nickel PlatedNoModerateBuy
RE-04600.375"0.205"4.743535150°Nickel PlatedNoModerateBuy
RE-04610.250"0.100"1.493535150°Nickel PlatedNoModerateBuy
RE-04620.875"0.375"153535150°Nickel PlatedNoModerateBuy

Sintered Neodymium
Standard Parts: RECTANGULAR MAGNETS

EAM Part No.LengthWidthThickLift StrengthMGOeGradeMax Op. Temp. (C)FinishMachineable?Impact Resist.
RE-00870.374"0.124"0.540"2.53535150°Nickel PlatedNoModerateBuy
RE-01152.00"2.00"0.500"513535150°Nickel PlatedNoModerateBuy
RE-01220.500"0.145"0.083"3.53535150°Nickel PlatedNoModerateBuy
RE-01331.875"0.875"0.312"283535150°Nickel PlatedNoModerateBuy
RE-03011.625"0.625"0.050"6.83535150°Nickel PlatedNoModerateQuote

Sintered Neodymium
Standard Parts: RING MAGNETS

EAM Part No.Outer Dia. (OD)Inner Dia. (ID)ThickLift StrengthMGOeGradeMax Op. Temp. (C)FinishMachine-able?Impact Resist.
RE-00810.250"0.063"0.080"1.33535150°Nickel PlatedNoModerateQuote
RE-03471.00"0.125"0.600"53535150°Nickel PlatedNoModerateBuy