N52 Neodymium Ring Magnets | Fullzen
Technical Specifications
Below are core magnetic parameters and size ranges for Fullzen N52 neodymium ring magnets. Custom special dimensions are available upon request.
| Parameter | Value Range |
|---|---|
| Max Energy Product (BH)max | 50 - 53 MGOe (398 - 422 kJ/m³) |
| Remanence Br | 14.2 - 14.8 kGs (1.42 - 1.48 T) |
| Coercivity Hcb | ≥ 10.5 kOe (836 kA/m) |
| Intrinsic Coercivity Hcj | ≥ 11.5 kOe (915 kA/m) |
| Max Operating Temperature | 80℃ (Standard N Series) |
| Curie Temperature | 310℃ |
| Br Temperature Coefficient | -0.12 %/℃ (20-100℃) |
| Hcj Temperature Coefficient | -0.6 %/℃ (20-100℃) |
| Density | 7.5 g/cm³ |
| Hardness | 550 - 650 Vickers |
| Electrical Resistivity | 140 - 160 μΩ·cm |
Size Range
Coating Options
Standard Stock Sizes
Why Choose N52 Grade Magnets?
N52 neodymium ring magnets stand as the peak performance standard of mass-produced sintered NdFeB materials. They are irreplaceable for high-end designs with limited installation space and extreme magnetic force requirements.
Typical Applications
Thanks to superior magnetic performance and high energy density, N52 neodymium ring magnets are widely used in premium industries with strict space and performance limits.
N52 vs Other N Series Grades Comparison
| Parameter | N35 | N42 | N45 | N48 | N52 ★ |
|---|---|---|---|---|---|
| (BH)max MGOe | 33-36 | 40-42 | 43-46 | 46-49 | 50-53 |
| Remanence kGs | 11.7-12.1 | 13.0-13.5 | 13.3-13.7 | 13.5-14.0 | 14.2-14.8 |
| Max Working Temp ℃ | 80 | 80 | 80 | 80 | 80 |
| Relative Price | Low (1.0x) | Medium (1.15x) | Medium-High (1.3x) | High (1.5x) | Highest (2.0x) |
| Performance Level | Entry | Standard | Mid-High | High | Ultimate |
| Recommended Scenarios | Cost-sensitive low-performance projects | General industrial equipment | Mid-high performance requirements | Heavy magnetic load demands | Extreme magnetic force & limited space |
What Does N52 Grade Mean?
N52 is a standard classification code for sintered neodymium magnets, split into letter and number segments representing coercivity class and maximum energy product respectively.
Letter N: Standard series grade, intrinsic coercivity Hcj ≥ 12 kOe, max working temperature 80℃
Number 52: Represents nominal maximum energy product (BH)max of 52 MGOe (Mega-Gauss-Oersted)
Extended temperature grades for higher heat resistance: M (100℃), H (120℃), SH (150℃), UH (180℃), EH (200℃)
Performance tolerance range: Each grade carries slight deviation; N52 covers 50–53 MGOe.
Fullzen N52 Magnet Manufacturing Capabilities
Fullzen operates 15 dedicated production lines for N52 grade magnets, with full in-house control from raw material batching, vacuum sintering to finished precision machining. Our monthly output reaches 20 tons to support large-batch and custom orders.
Production capacity: 12 vacuum sintering furnaces, monthly output of 20 tons N52 magnets, over 50 standard sizes in stock
Ultra-precision machining: Internal & external cylindrical grinders deliver tolerance down to ±0.02mm, concentricity ≤0.03mm
Magnetization options: Axial, radially magnetized, multi-pole (2–120 poles), skewed pole and Halbach array magnetization
Surface finishing: Over 10 coating types including NiCuNi, Zinc, Epoxy, Phosphating, Parylene, Gold, Silver and Electrophoresis
Strict quality control: 100% full inspection for magnetic flux, dimensions and appearance; magnetic performance deviation between batches ≤ ±2%
Custom secondary processing: Step rings, tapered rings, D-shapes, slots, countersunk holes and special profiles available
Sample Program
Fullzen offers sample testing service for N52 neodymium ring magnets. In-stock sizes ship fast, and custom prototypes can be manufactured to verify performance and assembly before mass production.
· Standard samples: 50+ ready sizes in warehouse, delivery within 1–3 days, small sample fees apply
· Custom prototypes: Manufactured per your technical drawings, lead time 7–15 days, tooling cost based on complexity
· Sample MOQ: 10–50 pcs for stock items, 5–20 pcs for custom prototypes (varies by size)
· Test documents included: Material certificate, dimensional inspection report, magnetic performance test report
· Sample fee rebate: All prototype charges refundable when bulk order reaches $700 equivalent
Custom N52 Ring Magnet Solutions
Standard stock sizes cannot always match unique project requirements. Fullzen provides flexible end-to-end customization covering dimensions, shapes, coatings and magnetization patterns.
· Custom dimensions: OD 2mm–200mm, wall thickness ≥0.5mm, height 0.5mm–100mm
· Special ring profiles: Step rings, tapered rings, D-cut rings, slotted rings, rings with mounting holes
· Custom coatings: Marine-grade epoxy for humid environments, medical gold plating for biocompatible applications
· Custom magnetization: Special pole arcs, unequal pole angles, sine-wave magnetization tailored to your magnetic circuit
· Magnet assembly service: Pre-bonded with metal or plastic carriers to reduce your assembly workload
· High-temperature upgrade: Switch to N52M (100℃) or N52H (120℃) if standard N52 cannot withstand operating heat
Custom N52 Ring Magnet Solutions
Stable magnet quality lays the foundation for reliable motor operation, and Fullzen maintains a full-process quality control system:
Dual certification of ISO 9001 and IATF 16949 automotive quality management systems
100% incoming raw material inspection to qualify rare earth composition and impurity limits
SPC statistical process control during sintering to restrict magnetic performance fluctuation within 3%
Complete dimensional and magnetic flux testing for all finished products
Material certificates and inspection reports provided per batch
RoHS & REACH compliance, conflict mineral statements available on request
Tier 3 PPAP documents accessible for automotive-grade customers
Frequently Asked Questions
We’ve sorted out common questions about N52 ring magnet selection and application to speed up your project evaluation. Contact our sales engineers for further technical support.
With identical dimensions, N52 features 24% higher (BH)max (52 MGOe vs 42 MGOe) and ~10% higher remanence. Actual pull force improvement ranges from 15–25% depending on magnetic circuit and air gap.
Choose N52 if: limited design space requires maximum magnetic force; lightweight miniaturization is required; high magnetic field strength is needed for precision instruments; lower-grade magnets fail performance tests. If N42/N48 satisfy your specs, we recommend those grades for better cost efficiency. Fullzen offers free magnetic simulation to optimize your grade selection.
80℃ is the rated max continuous working temperature for standard N52. Minor magnetic loss (under 5%) occurs at this temperature and recovers fully after cooling. Short-term exposure to 90–100℃ may cause slight irreversible demagnetization (≤2%) without full product failure. Long-term operation above 80℃ leads to gradual permanent flux decay and shortens service life. For high-temperature environments, select heat-resistant grades N52M (100℃), N52H (120℃) or N52SH (150℃) with matching magnetic performance.
- NiCuNi triple plating: Most popular option, bright surface, wear-resistant, 24–72h salt spray resistance for general indoor use
- Zinc plating: Budget-friendly, 12–48h salt spray protection for cost-sensitive projects
- Parylene coating: Ultra-thin uniform film, excellent chemical resistance for medical and precision equipment
- Gold/Silver plating: High electrical conductivity for electronic contact components Select coatings based on environmental corrosion, appearance standards and budget. Our technical team will recommend the optimal finish for your working conditions.
Multiple magnetization modes are supported for N52 ring magnets:
- Axial magnetization: N/S poles on top and bottom surfaces, the most common standard option
- Radial magnetization: N/S poles on inner and outer cylindrical surfaces, widely used in motors and sensors
- Multi-pole magnetization: Evenly distributed poles (4/8/12/24/48 poles) for motors and encoders
- Skewed pole magnetization: Angled poles for specialized motor designs
All pole counts and magnetization directions can be customized to your magnetic circuit design. Fullzen also develops dedicated magnetizing fixtures for unique requirements.
- Standard grinding: ±0.05mm ~ ±0.1mm
- Precision fine grinding: ±0.02mm ~ ±0.05mm
- Ultra-precision lapping: ±0.01mmHigher precision raises machining cost and extends lead time. Avoid over-specifying tight tolerances unless required for assembly fit. Our engineers propose the most economical tolerance range matching your assembly demands to control overall project cost.
Fullzen flexible MOQ policy: 1 piece for ready stock samples for prototype testing. Custom drawings generally require 100–500 pcs first order; long-term cooperative clients qualify for reduced MOQ down to 50 pcs. We support small-batch trial production for new product development to avoid excess inventory risk. Unit price drops gradually as order volume increases.
Under ideal operating conditions (below rated temperature, no reverse strong magnetic field, full anti-corrosion coating), sintered NdFeB permanent magnets decay extremely slowly, losing less than 1% flux annually, with service life over 10–20 years.
Demagnetization accelerates under these conditions: continuous operation above max temperature; exposure to strong opposing magnetic fields; surface corrosion damaging internal magnet structure; severe impact or vibration (NdFeB is brittle, cracks degrade magnetic output). We recommend reserving a 10–15% magnetic performance margin in design and applying proper protective coatings for long-term stability.
Wall thickness manufacturing limits depend on magnet outer diameter for stable yield. Ideal wall-to-diameter ratio is above 1:10 for easy production.
- OD under 20mm: Minimum wall thickness 0.5mm
- OD 20–50mm: Recommended wall thickness ≥1mm
- OD over 50mm: Recommended wall thickness ≥2mm
Thin-walled rings carry higher production difficulty, lower yield rates and higher unit cost. Contact our engineering team early to evaluate manufacturability and budget for ultra-thin wall designs.
Related Ring Magnet Products
Explore Fullzen’s complete neodymium ring magnet portfolio to find the best magnetic solution for your project.
Neodymium Ring Magnets — Full category guide covering all grades, dimensions and magnetization types
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Large Neodymium Ring Magnets — Oversized custom rings OD up to 200mm for wind power and MRI equipment
Radially Magnetized Ring Magnets — Internal-external pole design for micro motors and sensors
Countersunk Ring Magnets — Pre-drilled mounting holes for easy screw assembly in mechanical structures
Request Your Free Quote Today
Share your N52 ring magnet dimensions, magnetization requirements and end application details, and Fullzen’s professional engineering team will deliver customized technical solutions and quotation within 24 hours.
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