01 — Overview
About Block Magnets
Block magnets are rectangular sintered NdFeB with three principal dimensions — length, width, and thickness. The shape is fundamental for linear motor primaries, wind turbine generator rotor blocks, magnetic separator arrays, and any large-scale permanent-magnet assembly. Block production supports the largest NdFeB magnet sizes commercially available, with axial magnetization through thickness being the most common specification.
02 — Production Capability
What we can hold
- Length: up to 200mm
- Width: up to 150mm
- Thickness: up to 50mm
- Single-piece blocks or stacked assemblies for larger effective sizes
- Magnetization through thickness (most common), length, or width
- Full grade range including GBD-processed high-temp for wind and EV
03 — Typical Use Cases
Where Block magnets go to work
Linear motor primary magnets
Wind turbine generator rotor blocks
Magnetic separators for mining and recycling
Halbach array assemblies
MRI field blocks
Magnetic levitation demonstration assemblies
04 — Dimensions & Tolerances
Typical Dimensions & Tolerances
| Parameter | Specification |
|---|---|
| Typical dimensions | Up to 200×150×50mm; larger sizes via stacked/bonded assemblies |
| Tolerances | ±0.1mm standard, ±0.05mm precision |
Tighter spec?
These are typical production ranges. Send your drawing with the critical surfaces called out and we will confirm what we can hold against your tolerance stack-up.
05 — Recommended Grades
Recommended Grades for Block
N42
80°CHigh-performance sintered NdFeB grade widely used in compact motors, generators, and precision actuators.
N45
80°CHigher-flux sintered NdFeB grade suited to compact, high-torque designs where temperature is controlled.
N42H
120°CWorkhorse high-temperature NdFeB grade for automotive motors, pumps, and industrial drives up to 120°C.
N45H
120°CHigher-flux H-series NdFeB grade for compact 120°C motor designs demanding both torque and thermal stability.
N42SH
150°CWorkhorse SH-grade NdFeB for 150°C traction motors, robotics actuators, and high-duty servo drives.
N45SH
150°CHigh-flux SH-grade NdFeB for compact, high-torque motors operating continuously up to 150°C.
N42UH
180°CHigh-performance UH-grade NdFeB for the most demanding traction and high-temperature industrial motor applications.
06 — Related Applications
Related Applications
Wind Turbines
High-performance NdFeB magnet blocks and tile assemblies for permanent-magnet synchronous generators used in direct-drive and medium-speed wind turbines.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Frequently Asked Questions
What is the largest NdFeB block magnet you can produce?
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Standard single-piece production extends to approximately 200×150×50mm. Larger effective sizes are achieved through bonded or adhesive-stacked assemblies of multiple blocks — common in large wind turbine generators and MRI assemblies. For very large format requirements, we evaluate the correct balance of single-piece complexity versus assembly production cost.
What grade is best for wind turbine block magnets?
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N42SH or N45SH for onshore direct-drive generators; N42UH for offshore and premium designs. The SH or UH coercivity is required for 100–130°C operating temperature and the long service life (20–30 years) of wind turbine applications. Triple NiCuNi plus epoxy coating is standard for corrosion protection in the offshore environment.
Next step
Request a Quote for Block Magnets
Share dimensions, quantity, grade, and target application. Our engineering team responds within 1 business day with a grade recommendation, followed by pricing and lead time within 2 business days.