Cost-Effective: Competitive pricing from vertically integrated manufacturer
Stable Supply: Own production with 500+ ton annual capacity
Quick Delivery: Standard magnets ship in 7-15 days
Custom Solutions: From prototype to mass production
Quality Assurance: Full inspection reports with every shipment
Material Traceability: Lot-based documentation from raw material to finished magnet
Flexible MOQ: Start with small quantities for qualification
Global Shipping: Experienced logistics team for worldwide delivery
High Performance: N52 grade with (BH)max up to 52 MGOe
Temperature Grades: Standard, medium, and high temperature options
Complex Shapes: Arc segments, cylinders, blocks, rings, custom profiles
Technical Support: Free magnetic simulation and application engineering
Yield Optimization: High manufacturing yield keeps costs down
Direct Pricing: Factory-direct pricing without middlemen
Quality Cost Reduction: 99.5%+ first-pass quality reduces rejects
Volume Discounts: Competitive pricing for annual volume contracts
Sintered neodymium iron boron (NdFeB) magnets are the most powerful permanent magnets commercially available today. Discovered in 1984, they offer superior magnetic properties compared to traditional ferrite or SmCo magnets, making them essential for modern applications requiring compact, high-efficiency magnetic solutions.
Key Characteristics:
Highest Energy Product: Up to 52 MGOe (N52 grade)
High Remanence: Up to 1.48 T (14.8 kGs)
High Coercivity: Excellent resistance to demagnetization
Versatile Grades: From N35 to N52, including high-temperature options
Raw materials are melted, atomized, and crushed into fine powder
Vacuum induction melting
Jet milling to ~3-5μm
Oxidation control
Powder is pressed into green compacts with preferred orientation
Wet pressing or dry pressing
Alignment in magnetic field
Isostatic pressing option
Green compact is sintered at high temperature
Vacuum sintering at ~1100°C
Controlled heating/cooling
Density optimization
Optimizes magnetic properties through controlled annealing
Two-step or single-step aging
Microstructure optimization
Property enhancement
Magnet is coated and machined to final dimensions
Ni-Cu-Ni, Zn, Epoxy coating
CNC machining/slicing
Magnetization
| Property | Sintered NdFeB | Bonded NdFeB | Ferrite | SmCo |
|---|---|---|---|---|
| (BH)max (MGOe) | 35-52 | 5-12 | 3-5 | 20-32 |
| Remanence (kGs) | 11-14.8 | 5-8 | 3.9-4.5 | 8.5-11 |
| Coercivity (kOe) | 10-30 | 5-10 | 3-5 | 15-30 |
| Max Working Temp | 80-230°C | 100-150°C | 250-300°C | 300-350°C |
| Corrosion Resistance | Requires coating | Good | Excellent | Excellent |
| Cost | Medium-High | Low-Medium | Lowest | High |
| Typical Applications | Motors, generators | Motors, sensors | Loudspeakers, motors | Aerospace, military |
| Grade Range | N35 - N52 |
| Remanence (Br) | 11.7 - 14.8 kGs |
| Coercivity (Hcb) | 10.0 - 10.5 kOe |
| Intrinsic Coercivity (Hcj) | 12 - 15 kOe |
| Max Energy Product (BH)max | 33 - 52 MGOe |
| Working Temp (Tw) | ≤80°C |
| Temp Coefficient (Br) | -0.10%/°C |
| Temp Coefficient (Hcj) | -0.55%/°C |
Consumer electronics, computer hard drives, speakers, MRI systems, toy motors
| Grade Range | N42M - N48M |
| Remanence (Br) | 13.0 - 14.3 kGs |
| Coercivity (Hcb) | 10.0 - 12.5 kOe |
| Intrinsic Coercivity (Hcj) | 14 - 18 kOe |
| Max Energy Product (BH)max | 42 - 49 MGOe |
| Working Temp (Tw) | ≤100°C |
| Temp Coefficient (Br) | -0.10%/°C |
| Temp Coefficient (Hcj) | -0.50%/°C |
Electric power steering motors, hybrid vehicle motors, industrial servo motors
| Grade Range | N42H - N48H |
| Remanence (Br) | 12.8 - 14.0 kGs |
| Coercivity (Hcb) | 10.0 - 12.5 kOe |
| Intrinsic Coercivity (Hcj) | 17 - 20 kOe |
| Max Energy Product (BH)max | 42 - 48 MGOe |
| Working Temp (Tw) | ≤120°C |
| Temp Coefficient (Br) | -0.10%/°C |
| Temp Coefficient (Hcj) | -0.45%/°C |
Traction motors, wind turbine generators, air conditioning compressor motors
| Grade Range | N45SH - N52EH |
| Remanence (Br) | 13.2 - 14.5 kGs |
| Coercivity (Hcb) | 10.5 - 13.0 kOe |
| Intrinsic Coercivity (Hcj) | 20 - 35 kOe |
| Max Energy Product (BH)max | 45 - 52 MGOe |
| Working Temp (Tw) | ≤150 - 230°C |
| Temp Coefficient (Br) | -0.09%/°C |
| Temp Coefficient (Hcj) | -0.40%/°C |
High-speed motors, aerospace, downhole equipment, automotive motors in harsh environments
| Coating | Thickness | Salt Spray Test | Temperature | Applications |
|---|---|---|---|---|
| Ni-Cu-Ni (Triple Layer) | 15-25μm | >48 hours | ≤200°C | General purpose, most applications |
| Zinc (Zn) | 8-15μm | >24 hours | ≤120°C | Cost-effective, dry environment |
| Epoxy | 15-25μm | >96 hours | ≤130°C | Humid environment, outdoor |
| Parylene | 5-20μm | >100 hours | ≤100°C | Medical, FDA compliant |
Sintered NdFeB is manufactured using powder metallurgy processes, and its unique manufacturing method determines the following design constraints. Please refer to the traffic light indicators when selecting: ● Green = Feasible / ● Yellow = Limited / ● Red = Not Feasible
| Design Parameter | Typical Value | Status | Description |
|---|---|---|---|
| Min Wall Thickness | 1.0-2.0mm | ● | Limited by pressing pressure. Excessively thin walls cause uneven pressing, affecting magnetic properties |
| Min Hole Diameter | 1.0-3.0mm | ● | Core rod strength limitation. Thin core rods bend or break during pressing |
| Undercuts | N/A | ● | Not feasible. Powder metallurgy requires a draft angle (1-2°) for demolding |
| Internal Cavities | Simple cavities | ● | Simple internal cavities are feasible. Complex cavities are limited by mold structure |
| Threads | N/A | ● | Not feasible. Threads must be achieved through post-processing (tapping/inserts) |
| Gear Profiles | Preferred | ● | Strength of powder metallurgy. Suitable for mass production of precision gears |
| Draft Angle | 1-2° | ● | Required. Helps powder release smoothly from the mold, reducing product damage |
| Tolerance | 0.02-0.1mm | ● | Excellent precision. Suitable for precision magnetic circuit design |
| Surface Roughness | Ra 1.6-6.3μm | ● | Affected by powder particle size and sintering. Precision grinding can achieve Ra0.8μm |
| Lattice (Porous Structure) | Simple porous | ● | Simple porous structures are feasible. Complex lattice structures are limited |
| Metal Inserts | N/A | ● | Not feasible. Powder metallurgy is not suitable for pre-embedded inserts |
| Deep Holes | Limited | ● | Depth-to-diameter ratio is limited. Excessively deep holes lack sufficient core rod strength |
Fully leverage the net-shape advantage of powder metallurgy to reduce post-processing
Consider split design + assembly solutions for complex shapes
Contact us for DFM (Design for Manufacturing) support
NdFeB magnets have a porous structure, making surface treatment critical for corrosion protection. Below is the compatibility description for the main surface treatment methods:
| Surface Treatment | Compatibility | Typical Thickness | Application Scenarios & Notes |
|---|---|---|---|
| Ni-Cu-Ni (Triple Layer Nickel) | ● Recommended | 15-25μm | Most commonly used option with the best overall performance. Salt spray resistance >48 hours, suitable for most applications |
| Zinc Plating (Zn) | ● Recommended | 8-15μm | Cost-effective, suitable for dry environments. Salt spray resistance >24 hours |
| Nickel Plating (Ni) | ● Recommended | 10-20μm | Single nickel layer with bright appearance. Suitable for general-purpose applications with appearance requirements |
| E-coat (Electrophoretic Coating) | ● Recommended | 15-25μm | Excellent corrosion resistance, suitable for humid environments. Salt spray test >96 hours |
| Epoxy Coating | ● Recommended | 15-25μm | Top choice for outdoor/harsh environments. Thick coating provides long-term protection |
| PVD (Physical Vapor Deposition) | ● Recommended | 2-5μm | Thin coating with high adhesion. Suitable for precision dimension requirements |
| Passivation Treatment | ● Feasible | <1μm | Only applicable to stainless steel magnets. Generally not recommended for NdFeB |
| Spray Paint | ● Limited | 20-50μm | Requires sealing of magnet surface pores. Coating uniformity is difficult to guarantee |
| Passivation | ● Not Recommended | N/A | Only effective for stainless steel. NdFeB cannot be passivated for rust prevention |
Sintered NdFeB inevitably has 5-15% porosity, which affects coating adhesion
It is recommended to perform sealing treatment before coating to fill surface pores
For high humidity/salt spray environments, a E-coat + Sealing dual protection solution is recommended
Contact us for the best coating recommendation for your specific application
Powder metallurgy magnets offer significant cost advantages in high-volume production. Below is the typical cost structure and reference pricing for NdFeB magnets:
One-time investment
Standard simple shapes: ¥100,000-300,000
Complex shapes/multi-cavity molds: ¥300,000-500,000
Mold life: 500,000-1,000,000 shots
Depends on specifications
Small standard parts: ¥0.3-1/piece
Medium specifications: ¥1-5/piece
Large size/high grade: ¥5-8/piece
MOQ (Minimum Order Quantity)
Standard parts small batch: 1,000-5,000 pcs
Custom mold products: 10,000 pcs minimum
Large volume orders: Better unit pricing
Standard parts delivery
Simple custom parts
New mold custom production
Samples / Rush order
The biggest advantage of powder metallurgy is the cost reduction effect of high-volume production:
| Order Quantity | Price Factor | Unit Reference Price |
|---|---|---|
| 1,000-5,000 pcs | 1.5-2.0x | ¥0.6-2 |
| 10,000-50,000 pcs | 1.0x (Baseline) | ¥0.4-1.5 |
| 100,000-500,000 pcs | 0.6-0.8x | ¥0.25-0.8 |
| >1,000,000 pcs | 0.4-0.6x | ¥0.15-0.5 |
Note: Actual prices are affected by material grade, dimensional precision, surface treatment, and other factors
| Process | Tooling Cost | Unit Cost | Suitable Volume | Cost Advantage Range |
|---|---|---|---|---|
| Sintered NdFeB | Medium-High | Medium-Low | >10,000 pcs | Lowest cost in high volume |
| Bonded NdFeB | Medium | Medium | >5,000 pcs | Complex shapes |
| Hot-pressed NdFeB | High | Medium-High | >50,000 pcs | Non-oriented magnets |
| Ferrite magnets | Low | Lowest | Any quantity | Low-cost applications |
| SmCo magnets | High | Highest | >1,000 pcs | High temperature / Military |
| Machining (block cutting) | None | High | <100 pcs | Small batch samples |
Electric power steering (EPS) motors
Hybrid/EV traction motors
Start-stop motor generators
Seat adjustment motors
Fuel pump motors
ABS motor sensors
Direct-drive wind turbine generators
Gearless wind generators
Pitch control motors
Yaw system motors
Servo motors
Stepper motors
Linear motors
Torque motors
Generator sets
Pump motors
Hard disk drive (HDD) voice coil motors
Speaker drivers
Headphone drivers
Smartphone vibration motors
Wearable device motors
Gaming controller haptics
Robot joint motors
Linear actuators
Encoder motors
Automated guided vehicles
CNC servo systems
MRI systems
Dental handpiece motors
Surgical robot actuators
Infusion pump motors
Prosthetic devices
ISO 9001, IATF 16949 certified. Full magnetic measurement, dimensional inspection, and salt spray testing capabilities.
Own powder production, pressing, sintering, coating, and magnetization. Complete vertical integration ensures quality and consistency.
Modern pressing (up to 2000 ton), hydrogen decrepitation, jet milling, and multi-layer coating lines with in-line inspection.
Hysteresis graph, Helmholtz coil tester, salt spray chamber, scanning electron microscope for microstructure analysis.
Multi-pole magnetization, radial magnetization, complex magnetization patterns. Magnetization fixtures custom-designed for your application.
Standard magnets ship in 7-15 days. Prototype samples in 3-5 days. Express service available for urgent requirements.
N52 has the highest energy product (52 MGOe) and is the strongest grade commercially available. N35 is the entry-level grade (35 MGOe). Higher grades offer more magnetic energy in smaller volumes but at higher cost.
The working temperature depends on your application's maximum operating temperature plus a safety margin. For automotive under-hood (120°C), use H grade or higher. For room temperature applications, standard N grades are sufficient.
AH grades (up to 230°C working temp) are available, but cost is significantly higher. For temperatures above 230°C, consider SmCo magnets (up to 350°C) instead.
Ni-Cu-Ni is the most versatile and commonly used. Epoxy offers better corrosion resistance for humid environments. For food contact or medical applications, parylene or special coatings may be required.
Yes, we can provide samples for qualification. Sample fees are typically credited against production orders. Contact us with your specifications for a quote.
Standard catalog shapes (cylinders, blocks, rings) can be ordered in small quantities. Custom magnets typically require MOQ of 100-1000 pieces depending on complexity.
Contact our magnet experts for custom quotes, samples, or technical support. We help you select the optimal grade, coating, and magnetization pattern for your application.
Contact: Cindy | Phone: +86 021 5512 8901 | Email: sales1@brm-metal.com
Grade: N42SH
Coating: Ni-Cu-Ni
Application: EV Motors
Grade: N48M
Multi-pole: 8-32 poles
Application: Servo Motors
Grade: N52
Coating: Epoxy
Tolerance: ±0.02mm