Sintered NdFeB magnets for high-performance compact designs.
Neodymium iron boron is the strongest permanent magnet route in this product set. Use it when output, size, and weight need to be optimized together, then review grade, coating, temperature, and magnetization before committing to production.
MaterialNeodymium, iron, boron
ProcessSintered rare earth magnet
ShapesBlocks, discs, rings, arcs, segments, assemblies
Main reasonHighest magnetic performance in compact space
Product
Record-level pull strength in the smallest possible package.
Sintered NdFeB should be evaluated when the part needs maximum magnetic energy density and the surrounding assembly can manage coating, temperature, and brittle material handling. The design work is usually not the magnet shape alone; it is the full magnetic circuit, the air gap, the coating stack, and the inspection method.
Compact size and low weight
Highest magnetic performance in this range
Broad shape and coating options
Use this route when
- The design has limited space but needs strong magnetic output.
- The application needs a compact motor, sensor, holding, or rotor magnet.
- The geometry can be machined or assembled from sintered magnet forms.
- Coating, temperature grade, and magnetization direction can be specified clearly.
Review before choosing
- NdFeB is brittle and coating choice must match corrosion exposure.
- Temperature class should be selected before quoting, not after sampling.
- Magnetization direction and assembly fixture can change the manufacturing route.
- Rare earth content, cost, and supply planning should be reviewed for repeat orders.
Specification
Strong output with sustainability, coating, and temperature tradeoffs.
The sintered route creates a dense rare earth magnet with high magnetic alignment. Grade selection should balance output, thermal class, demagnetization margin, coating durability, and any program requirement around heavy rare earth content or recycled material strategy.
Specification should define the operating envelope, not only the grade name.
| Material system | Sintered NdFeB; grade selected by magnetic output, temperature class, and demagnetization margin. |
|---|---|
| Typical forms | Blocks, discs, cylinders, rings, arcs, segments, countersunk magnets, and mounted assemblies. |
| Surface protection | Nickel, epoxy, zinc, or project-specific coating route depending on corrosion, adhesive, and handling. |
| Magnetization | Axial, diametrical, radial, multipole, or fixture-dependent direction depending on the assembly. |
| Engineering risk | Thermal exposure, corrosion, brittle edges, coating thickness, and mechanical impact during assembly. |
Technical Data
Sintered NdFeB grade reference bands.
Use these rows as a specification conversation starter. Final values depend on grade family, tolerance, coating, magnetization fixture, and supplier data sheet.
Download NdFeB grade guide (PDF)
| Grade / Route | Br (T) | Hcj (kA/m) | BHmax (kJ/m³) | Max temp. (°C) | Density (g/cm³) |
|---|---|---|---|---|---|
| N35 | 1.17-1.22 T | >=955 kA/m | 263-287 kJ/m3 | 80 C | 7.5 g/cm3 |
| N42SH | 1.29-1.33 T | >=1592 kA/m | 318-342 kJ/m3 | 150 C | 7.5 g/cm3 |
| N48H | 1.38-1.42 T | >=1353 kA/m | 366-390 kJ/m3 | 120 C | 7.5 g/cm3 |
| N35EH | 1.17-1.22 T | >=2388 kA/m | 263-287 kJ/m3 | 200 C | 7.5 g/cm3 |
Temperature class, geometry, and load line must be checked together before a grade is approved.
Forms and manufacturing scope
Available forms should be selected around the final magnetic circuit.
Blocks and bars
For compact fields, holding systems, sensors, fixtures, and custom assemblies.
Discs and cylinders
For axial magnetization, couplings, sensors, and compact component interfaces.
Rings and sleeves
For coaxial assemblies, encoders, pumps, and rotor interfaces.
Application examples
Typical NdFeB applications focus on compact high-strength fields.
Motors and drive systems
Rotor and segment magnets where torque density and repeatable magnetization matter.
Sensors and encoders
Small magnets with defined direction, tolerance, and magnetic inspection targets.
Holding and fixtures
Blocks, discs, and assemblies where pull force and coating durability need to align.
Related product routes