Product Overview
The automotive grade strong ring magnet is a high-performance permanent magnet featuring a Round disc design for secure mechanical fastening. The industrial grade strong ring magnet is manufactured using high-grade NdFeB material (e.g., N35–N52) and coated with triple-layer nickel plating (Ni-Cu-Ni), significantly improving corrosion resistance and surface durability. It is ideal for applications requiring both strong magnetic performance and robust mechanical mounting.
Technical Parameters
|
Product Data Level |
Description |
|
Product Name |
Strong ring magnets |
|
Magnet Grade |
N42 (Br ≥ 13.2 KGs, Hcj ≥ 10.8 KOe) |
|
Dimensions |
D6x 3x1.5 |
|
Dimensional Tolerances |
Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm |
|
Working Temperature |
≤ 80°C (custom high-temperature versions available) |
|
Surface Magnetic Field |
2400 Gauss (measured with TM-801 Gauss meter, Japan) |
|
Magnetic Flux |
1.8 mWb (measured with fluxmeter) |
Reliability Testing
Sample Preparation and Baseline Verification
- Samples are defined by grade, coating type, dimensions, magnetization direction, and production batch.
- Sampling is performed on a batch basis in accordance with internal quality control or customer AQL requirements.
- Prior to testing, samples are cleaned, dried, and visually inspected.
- Baseline data are recorded, including magnetic properties (Br, Hcj, surface flux), dimensions, and coating appearance.
√ Coating and Surface Quality Inspection
- Visual inspection under normal light and 10× magnification for pinholes, scratches, blistering, peeling, or edge damage.
- Coating thickness is measured by XRF or cross-section methods.
- Adhesion is evaluated using tape pull or cross-cut testing according to internal or customer standards.
√ Corrosion Resistance Testing
- Neutral Salt Spray (NSS) testing is conducted at 35 °C using a 5% NaCl solution.
- Test duration is selected based on coating type (typically 24–72 hours).
- After testing, samples are rinsed, dried, and inspected for corrosion, coating degradation, and edge penetration.
Packaging
● Verify surface finish, coating thickness, and magnetization orientation.
● Individually separate magnets with non-magnetic materials to avoid chipping or cracking.
● Use custom foam inserts or trays to ensure fixed positioning.
● Seal packages to protect against moisture and contamination.
● Store packed magnets in a dry, temperature-controlled environment prior to shipment.
Application Fields
Consumer Electronics
Employed in Bluetooth speakers, earbuds, and microphones for sound generation
Integrated into smartphones for vibration motors, magnetic closures, and audio modules
Motors & Sensors
Key components in miniature motors and BLDC (Brushless DC) motor rotor-stator assemblies
Used in speed and position sensing systems such as Hall-effect sensors and magnetic encoders
FAQ
Q1. What causes flux drift during long-term thermal exposure below rated temperature?
Answer:
Prolonged exposure near the upper operating temperature accelerates microstructural changes and coating degradation, leading to gradual flux reduction even without exceeding design limits.
Q2. How does surface roughness influence coating adhesion?
Answer:
Excessively smooth surfaces reduce mechanical bonding, while overly rough surfaces trap contaminants. Controlled surface roughness is essential for optimal coating adhesion and durability.
Q3. Why is magnet polarity verification required even after automated magnetization?
Answer:
Fixture misalignment, partial saturation, or human error can still occur. Polarity verification acts as a final safeguard against catastrophic assembly errors.
Usage Precautions
Handling
NdFeB magnets are hard and brittle; avoid dropping or impact to prevent chipping or cracking.
01
Safe Operation
Strong magnetic force may cause pinching injuries. Slide magnets apart rather than pulling them directly.
02
Proper Installation
Verify and align magnetic polarities correctly to ensure optimal function and prevent assembly issues.
03
Storage Conditions
Store magnets away from high temperature, humidity, and corrosive environments.
04
Magnetic Interference
Keep magnets away from sensitive devices such as hard drives, IC cards, and pacemakers.
If you require samples, technical datasheets, or certifications-including MSDS, RoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, or ISO 27001-our sales engineers are ready to support you at any time.
We're here to help!
Phone/WhatsApp/WeChat: +86 13829120676
Email: info@jinconn.com
Website: www.jinconnmagnet.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong, China
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