Custom N40 Magnets Manufacturer in China
N40 Magnet is a high-performance neodymium iron boron (NdFeB) permanent magnet grade that offers an excellent balance between magnetic strength, cost efficiency, and manufacturing flexibility. With a maximum energy product of approximately 40 MGOe, N40 magnets are widely used in motors, sensors, magnetic assemblies, electronics, automation equipment, and industrial applications.
As an experienced custom neodymium magnet manufacturer, we supply N40 magnets in various shapes, sizes, coatings, and magnetization directions to meet the specific requirements of OEM and industrial customers worldwide.
What Is an N40 Magnet?
N40 refers to a specific grade of sintered neodymium magnet. The “40” indicates the magnet’s maximum energy product (BHmax), which is approximately 40 MGOe.
Compared with lower grades such as N35 and N38, N40 provides stronger magnetic performance while maintaining competitive pricing. It is often selected when higher magnetic force is required without upgrading to premium grades like N45, N48, or N52.
N40 Magnet Specifications
| Property | Value |
|---|---|
| Magnet Grade | N40 |
| Material | NdFeB (Neodymium Iron Boron) |
| Maximum Energy Product (BHmax) | 38-42 MGOe |
| Residual Flux Density (Br) | 12.4-12.8 kGs |
| Coercive Force (Hcb) | ≥ 11.0 kOe |
| Intrinsic Coercivity (Hcj) | ≥ 12.0 kOe |
| Maximum Working Temperature | 80°C (176°F) |
| Density | 7.4-7.6 g/cm³ |
| Magnetization Direction | Custom Available |
| Tolerance | ±0.05 mm or Customized |
Values are typical and may vary according to production requirements.
Available Shapes for N40 Magnets
We manufacture custom N40 magnets in a wide range of shapes and configurations:
N40 Disc Magnets
Ideal for sensors, magnetic closures, medical devices, and electronics.
N40 Ring Magnets
Widely used in motors, speakers, generators, and magnetic couplings.
N40 Block Magnets
Suitable for industrial machinery, magnetic separators, and holding systems.
N40 Arc Magnets
Commonly used in permanent magnet motors and wind turbine generators.
N40 Countersunk Magnets
Designed for screw mounting applications.
N40 Rod Magnets
Used in magnetic assemblies and industrial equipment.
N40 Custom Magnets
Manufactured according to customer drawings, CAD files, or application requirements.
Available Coatings
Neodymium magnets require protective coatings to prevent corrosion and improve durability.
Available coating options include:
- Nickel (Ni-Cu-Ni)
- Epoxy Coating
- Zinc Coating
- Black Epoxy
- Gold Plating
- Phosphating
- PTFE Coating
- Parylene Coating
Our engineering team can recommend the most suitable coating based on your operating environment.
Applications of N40 Magnets
N40 magnets are widely used across numerous industries.
Electric Motors
Provide reliable magnetic performance for industrial motors and automation systems.
Sensors and Electronics
Used in Hall-effect sensors, switches, encoders, and consumer electronics.
Magnetic Assemblies
Integrated into magnetic holders, clamps, and mounting systems.
Renewable Energy
Applied in generators, wind turbines, and energy conversion equipment.
Medical Equipment
Utilized in medical instruments and diagnostic devices.
Industrial Automation
Support robotic systems, actuators, conveyors, and automated production lines.
Consumer Products
Used in magnetic locks, speakers, headphones, and smart devices.
Why Choose N40 Magnets?
N40 magnets offer several advantages for industrial buyers:
Strong Magnetic Performance
Higher magnetic strength than N35 and N38 grades.
Cost-Effective Solution
Provides excellent performance without the premium cost of ultra-high grades.
Versatile Applications
Suitable for a wide range of industries and operating conditions.
Flexible Manufacturing
Available in custom sizes, shapes, coatings, and magnetic orientations.
Reliable Supply
Ideal for both prototype development and large-volume production.
N40 vs N35 vs N38 vs N42
| Grade | Magnetic Strength | Cost | Typical Applications |
|---|---|---|---|
| N35 | Standard | Lowest | General-purpose products |
| N38 | Higher | Low | Electronics and sensors |
| N40 | Strong | Moderate | Motors, automation, assemblies |
| N42 | Stronger | Higher | High-performance industrial applications |
N40 is often considered the optimal balance between magnetic performance and overall project cost.
Custom N40 Magnet Manufacturing Capabilities
We provide complete custom manufacturing services including:
- Custom dimensions
- Custom shapes
- Tight tolerances
- Magnetization direction design
- Prototype production
- Bulk manufacturing
- Magnetic assemblies
- Surface treatment solutions
- Packaging customization
Whether you need simple disc magnets or complex engineered magnetic components, our team can support your project from design to mass production.
Quality Assurance
Every batch of N40 magnets undergoes strict quality inspections including:
- Magnetic property testing
- Dimension inspection
- Coating thickness verification
- Flux measurement
- Salt spray testing
- Appearance inspection
Our quality management process ensures consistent performance and reliability for industrial applications.
Frequently Asked Questions
Standard N40 magnets can operate continuously up to 80°C (176°F). For higher temperature applications, H, SH, UH, EH, and AH grades are available.
Yes. N40 magnets provide higher magnetic energy and stronger magnetic force compared to N38 magnets.
Yes. We manufacture N40 magnets according to custom drawings, specifications, and application requirements.
Epoxy coating is generally recommended for humid or outdoor environments because it offers enhanced corrosion resistance.
Industrial automation, electric motors, renewable energy, sensors, electronics, medical equipment, and magnetic assemblies.
Request a Quote
Send us your drawings, dimensions, coating requirements, magnetization direction, and annual quantity requirements, and our engineering team will provide a customized solution and quotation.