N55 Neodymium Magnets Supplier
The Highest Energy Product in Sintered NdFeB · Custom Shapes · ISO Certified · China Manufacturer
Mainrich Magnets, with over 30 years of expertise, is a trusted manufacturer and supplier of N55 neodymium magnets in China. We supply custom N55 magnets in any shape, size, and coating — delivering the highest energy product available in sintered NdFeB to meet the demands of your most advanced projects. Contact us today for a fast, competitive quote.
Custom N55 Neodymium Magnets by Shape
N55 grade is available across all standard magnet shapes. Select a shape below to view product details:
N55 Disc Magnets
N55 Block Magnets
N55 Ring Magnets
N55 Arc Magnets
N55 Countersunk
Custom N55 Shape
What Are N55 Neodymium Magnets?
N55 neodymium magnets are among the highest-grade sintered NdFeB permanent magnets commercially available, delivering a maximum energy product (BHmax) of 52–55 MGOe — approximately 6% stronger than N52 and nearly 60% stronger than N35.
The "N" designates sintered neodymium-iron-boron (NdFeB) composition, while the number indicates the maximum energy product in megagauss-oersteds (MGOe). Achieving N55 grade requires exceptional raw material purity, tightly controlled sintering conditions, and precise alloy composition — which is why fewer suppliers produce it reliably at scale.
At Mainrich, we manufacture N55 magnets using virgin rare earth materials and fully automated production lines, achieving ±0.05mm dimensional tolerance and 100% flux inspection per batch. If your application demands the absolute maximum magnetic performance in the smallest possible volume, N55 is the answer.
N55 Neodymium Magnet Technical Specifications
The following table details the key magnetic and physical properties of N55 grade magnets as manufactured by Mainrich:
Magnetic Properties
| Property | N55 Value | Unit |
|---|---|---|
| Remanence (Br) | 14.5 – 15.0 | kGs |
| Coercivity (HcB) | ≥ 10.5 | kOe |
| Intrinsic Coercivity (HcJ) | ≥ 12 | kOe |
| Max Energy Product (BHmax) | 52 – 55 | MGOe |
Physical & Thermal Properties
| Parameter | Value |
|---|---|
| Density | ~7.5 g/cm³ |
| Max Operating Temperature | 60 – 80°C (140 – 176°F) |
| Curie Temperature | ~310°C |
| Dimensional Tolerance | ±0.05mm (standard) |
| Available Coatings | NiCuNi, Epoxy, Zinc, Gold, Parylene |
How Does N55 Compare to Other Neodymium Grades?
Understanding where N55 sits in the NdFeB grade spectrum helps you decide whether the performance premium justifies the cost for your specific application.
| Grade | BHmax (MGOe) | Max Temp (°C) | Relative Cost | Best For |
|---|---|---|---|---|
| N35 | 33 – 35 | 80°C | $ | Cost-sensitive, general use |
| N42 | 40 – 42 | 80°C | $$ | General industrial, motors |
| N52 | 50 – 52 | 80°C | $$$ | Robotics, aerospace, medical |
| N55 | 52 – 55 | 80°C | $$$$ | Maximum strength applications |
| N42SH | 40 – 42 | 150°C | $$$ | High-temp motors, automotive |
The performance gap between N52 and N55 is approximately 6% in BHmax. In most standard applications, this difference is marginal. However, for designs operating at absolute space constraints — where every cubic millimeter of magnet volume is critical — N55 enables further miniaturization that N52 cannot achieve.
When Should You Choose N55?
✅ Choose N55 when:
- Your design is space-constrained beyond what N52 can solve
- Maximum holding or torque force is required in minimum volume
- Operating temperature stays below 80°C consistently
- Precision positioning requires the highest possible flux density
- You are prototyping next-generation compact actuators or sensors
- Budget allows for premium material cost
❌ Avoid N55 when:
- Application temperature exceeds 80°C (use SH/UH/EH grades)
- Magnets will face repeated mechanical shock or impact
- Cost and volume are primary constraints
- N52 already meets your performance requirements
- Application is in corrosive or marine environments without housing
N55 Neodymium Magnet Applications
N55 magnets are selected for applications where maximum magnetic performance in minimum size is non-negotiable. Common use cases include:
Advanced Robotics & Humanoid Robots
Humanoid robot joint actuators demand the highest torque density in body-shaped form factors. N55 magnets allow motor designers to shrink actuator size while maintaining force output — critical for compact finger joints, wrist actuators, and ankle mechanisms.
Medical Devices & Surgical Robotics
MRI-compatible actuators, drug delivery system locks, and minimally invasive surgical tools require magnets that generate strong fields without increasing device footprint. N55 is increasingly specified in next-generation implantable and robotic surgical systems.
Aerospace & Defense
Compact guidance systems, high-force holding mechanisms, and miniaturized positioning actuators in aerospace applications demand proven maximum-grade performance. N55 delivers the field strength required in weight and space-critical aerospace designs.
High-Performance Electric Motors
For BLDC motors where size is constrained but torque requirements are fixed, N55 arc segment magnets allow engineers to reduce rotor diameter or stack length while maintaining motor output. Particularly relevant in micro-motors for consumer electronics and precision instruments.
Precision Sensors & Encoders
Encoders and Hall effect sensors used in high-resolution positioning systems benefit from N55's higher remanence, producing stronger field gradients that improve sensor resolution and reduce signal noise at small air gaps.
Limitations and Handling Considerations
N55 magnets share the inherent limitations of all high-grade NdFeB materials, and require careful handling and system design:
| Limitation | Risk | Recommended Mitigation |
|---|---|---|
| Brittleness | Chipping and cracking on impact | Use non-metal or plastic housing; avoid direct contact between magnets |
| Corrosion susceptibility | Surface oxidation without coating | Specify NiCuNi or Epoxy coating for all applications |
| Low heat resistance | Irreversible demagnetization above 80°C | Use N42SH/N48SH for high-temperature environments |
| Strong attractive force | Pinching injury during assembly | Follow safe handling guidelines; use assembly jigs |
| Higher cost vs N52 | Cost impact on high-volume production | Run cost-performance analysis; N52 may suffice at volume |
Why Source N55 Magnets from Mainrich?
Producing consistent N55 grade magnets requires tighter process control than standard grades. Not all manufacturers can reliably hit the BHmax specification at N55. Mainrich's quality advantage comes from:
- Virgin rare earth materials — no recycled content that compromises magnetic properties
- Fully automated sintering lines — consistent density and grain alignment across every batch
- 100% flux inspection — every piece measured before shipment
- ±0.05mm dimensional tolerance — verified by CMM inspection
- Free samples available — shipping paid by customer; sample fee may apply for high-value products
- DFM report in 24 hours — send your drawing, receive design-for-manufacturing feedback same day
- ISO 9001:2015 | IATF16949 | RoHS | REACH certified
- NDA available — full IP protection for your motor and device designs
Trusted by Huawei, Hitachi, Johnson Electric, Canon, and 500+ global manufacturers since 1992.
Explore Other Neodymium Grades
If N55 exceeds your requirements or budget, the following grades may better match your application:
Frequently Asked Questions
Is N55 really stronger than N52?
Yes. N55 has a BHmax of 52–55 MGOe compared to N52's 50–52 MGOe — approximately a 6% improvement in maximum energy product. In most applications this difference is small, but for ultra-compact designs where every milliTesla matters, N55 provides a meaningful performance edge.
What is the maximum operating temperature for N55?
Standard N55 grade is rated to 60–80°C. For applications that exceed this temperature, we recommend switching to a high-coercivity grade such as N42SH (rated to 150°C) or N48H (rated to 120°C). Contact our application engineers to discuss your thermal requirements.
Can N55 magnets be customized to any shape?
Yes. Mainrich produces N55 magnets in disc, block, ring, arc, cylinder, countersunk, and fully custom geometries. Send your drawings or specifications to receive a DFM report and prototype quotation within 24 hours.
What is the MOQ for custom N55 magnets?
Minimum order quantity starts at 500 pieces for most shapes. For samples, we can offer free samples — however, shipping costs must be paid on delivery or in advance. For certain high-value products, a sample fee may apply. This allows you to evaluate our quality before committing to full production.
How do I know if N55 is worth the cost premium over N52?
If your current design using N52 already meets dimensional and force requirements with margin to spare, N52 is the better choice. N55 is worth the premium when N52 cannot achieve the required field strength within your dimensional constraints — for example, when a motor must fit in a smaller housing without reducing torque output. Our engineering team can run a grade comparison for your specific application on request.