Special-U-Shaped High-Power NdFeB Magnet

1. Product Overview

This magnet is a high-performance special-shaped NdFeB magnet, with a grade of N45, featuring exceptionally high magnetic strength, good demagnetization resistance, and precise dimensional accuracy. Custom precision is available upon request. Its complex-shaped design meets high-performance magnetic requirements in compact spaces, widely used in high-end electronics, smart wearables, industrial power tools, and magnetic toys.

Manufactured using advanced special-shaped cutting and grinding wheel molding processes, the product ensures clean edges and uniform dimensions. Surface treatment includes multi-layer metal plating (Ni+Cu+Ni) or optional Zn plating, effectively preventing oxidation and corrosion, extending service life.

2. Technical Parameters

Product Name: Special-U-Shaped High-Power NdFeB Magnet
Magnetic Grade: N45 (Br ≥ 13.7 kGs, Hcj ≥ 12 kOe)
Dimensions: Y9×8×8.5mm (customizable)
Dimensional Tolerance: Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm
Operating Temperature: ≤80°C (high-temp version available)
Density: ≥7.5 g/cm³
Surface Magnetic Field: 3800 ±200 Gauss (measured with TM-801 Gauss meter)
Magnetic Flux: 2.3 mWb (measured with fluxmeter)

3. Manufacturing Process

Special-Shaped Cutting: Custom wire-cutting equipment for non-square/non-circular geometries.

Grinding Wheel Molding: Ensures complex structures and high-precision shaping.

Demagnetization Treatment: Pre-demagnetization before precise magnetization to avoid post-assembly magnetic deviation.

Laser Marking: N-pole marking, supports custom logos/numbers.

4. Surface Treatment & Plating

To enhance corrosion resistance and appearance:

Default Plating: Triple-layer Ni-Cu-Ni (customizable).

Standard Thickness: Ni (3μm) + Cu (5μm) + Ni (4μm).

Optional Plating: Single-layer Zn (5μm) for cost-sensitive projects.

Features:

✔ Salt spray & oxidation resistance

✔ Increased surface hardness (scratch-resistant)

✔ Improved gloss (ideal for exposed components)

5. Appearance & Dimensional Inspection

All products undergo strict QC:

Manual caliper/micrometer measurement

Visual inspection (800–1200 lux, 20–750px distance)

2D imaging measurement (for complex shapes)

CCD sorting machine (auto-checking dimensions/appearance)

Magnetic flux testing (batch consistency)

6. Reliability Testing

6.1 Neutral Salt Spray (NSS) Test

Temperature: 35±2°C

Salt deposition: 1–2 ml/2000px²·h

pH: 6.5–7.2

Duration: 24h/48h/72h/96h (customizable)

6.2 Thermal Demagnetization Test

80°C oven for 2h (customizable duration)

Demagnetization rate ≤10% = Pass

6.3 Drop Test Note

⚠ Not suitable for impact tests (NdFeB is brittle—may chip/crack).

7. Packaging Process

Defective products removed

Magnetized and neatly arranged

Custom labeling/quantities per box

Vacuum-sealed with anti-magnetic spacers & shockproof padding

Outer box: Moisture/impact/magnetic interference protection

8. Applications

Widely used in:

Smart Wearables: Smart bands, earbud positioning, electric toothbrush charging bases.

Power Tools: Motor cores, brake systems, sensors.

Magnetic Toys: Magnetic building blocks, snap-together DIY toys.

9. Usage Precautions

Handle gently: Avoid impacts/drops (brittle material).

Prevent pinching: Slide magnets apart—do not pry.

Polarity check: Install correctly per N-pole marking.

Avoid moisture/acids: Store in dry, mild environments.

Keep away from sensitive devices: Hard drives, IC cards, pacemakers, etc.

10. Customization & Services

We support:

Dimensions/shape/plating (layers, thickness, color)

Polarity & magnetic strength adjustments

Laser marking (logos/serial numbers)

Special encapsulation & pull-force testing

Request samples, datasheets (MSDS/RoHS), or certifications (ISO9001, IATF16949, etc.) from sales engineers.