Nickel plated ring

1. Product Overview

Nickel plated cylindrical magnets with center holes deliver excellent magnetic performance and corrosion resistance, ensuring stability and reliability across a wide range of environments. Featuring a bright, silver-colored multilayer nickel coating, the surface offers superior rust prevention, abrasion resistance, and a clean, attractive appearance. The center hole design improves mounting convenience and structural adaptability, offering greater flexibility for mechanical assembly and precision alignment. These magnets are widely used in high-performance motors, position sensors, medical devices, smart wearables, consumer electronics, and industrial automation applications. Custom specifications, dimensions, and magnetization directions are available to meet diverse application needs.

2. Technical Parameters

- Product Name: Nickel Plated Cylindrical Magnet with Center Hole

- Magnet Grade: N48 (Br ≥14.3 kGs, Hcj ≥ 10.8 KOe)

- Dimensions:Y20x10x5mm

- Tolerance: Length ±0.05 mm, Width ±0.05 mm, Thickness ±0.05 mm

- Operating Temperature: ≤ [value]°C (High-temperature versions available)

- Density: ≥ 7.5 g/cm³

- Surface Magnetic Field: 2600-4200Gauss

- Magnetic Flux:  1.5-3.5mWb

3. Manufacturing Process

The product is manufactured through the following key processes:
Wire Cutting: Uses molybdenum/copper wire cutting equipment to achieve ±0.02mm precision for small-batch custom rings.

Centerless Grinding: Refines inner and outer diameters to ensure roundness (±0.05mm tolerance).

Double-Disc Grinding: Controls thickness and parallelism.

4. Surface Treatment & Coating Technology

- Laser Sealing: Seals microcracks on the surface, significantly enhancing salt spray resistance, lasting over 1000 hours.

- Nickel Coating (Ni-Cu-Ni Structure): Triple-layer plating of copper, intermediate nickel, and outer nickel. Combines mechanical strength and corrosion resistance in harsh conditions. The dense outer nickel layer prevents rust, chemical corrosion, and abrasion, extending service life and offering an attractive metallic finish suitable for both industrial and consumer applications.

5. Appearance & Dimensional Inspection Standards

- Manual measurement with micrometers or calipers

- Visual inspection under 800–1200 lumens

- 2D optical measurement for non-standard or irregular shapes

- CCD intelligent sorting system for full inspection

- Magnetic flux testing to ensure consistency across batches

6. Reliability Testing

Impact Testing and Vibration Testing: Simulate shocks and vibrations during transportation and usage to ensure the magnet's reliability in working environments.  

High-Temperature Demagnetization Testing: Verify the magnetic stability of the magnet under high-temperature conditions to ensure long-term performance consistency.  

Damp Heat Testing: Expose the magnet to high-humidity environments to examine its moisture resistance and anti-corrosion capabilities.

7. Packaging Process & Instructions

- Defective products are removed after full inspection

- Approved magnets are magnetized and arranged uniformly

- Packed in boxes with custom quantities and labeling

- Each unit is vacuum-packed with anti-magnetic shielding and shock-absorbing pads

- Small boxes are packed into larger cartons offering moisture, impact, and EMI protection

- Packaging customization available

8. Application Fields

- Motors & Drive Systems: Used in brushless, micro, and stepper motors to provide stable magnetic fields and enhance performance

- Sensors & Control Equipment: Deployed in Hall sensors, encoders, and displacement detection devices for precise response

- Medical & Laboratory Devices: Employed in MRI auxiliary parts, magnetic fixtures, reagent separation tools, etc.

- Consumer Electronics: Integrated into Bluetooth earbud magnetic clasps, smartwatch magnetic charging systems, and magnetic accessories

- Industrial Automation & Clamping Tools: Used in robotic arms and magnetic jigs for efficient assembly and repeatable positioning

- New Energy & Smart Manufacturing: Applied in EV drive systems, wind power generators, and intelligent manufacturing equipment.

9. Usage Precautions

- Mechanical Protection: Avoid impact or dropping; drilling and cutting post-production is prohibited

- Defective products are screened out

- Uniform magnetization and neat arrangement of qualified products

- Packed according to customer specifications with labels

- Vacuum-sealed packaging with shielding and cushioning

- All boxes are moisture-proof, shock-resistant, and shielded from magnetic interference

10. Customization & Services

- Size, shape, coating (layer count, thickness, color) customization

- Custom magnetic polarity and strength

- Laser engraving for logos or serial numbers

- Tailored packaging design and pull-force testing for special applications

We are pleased to offer free customized magnet solutions tailored to your specific needs.
If you require samples, technical datasheets, or certifications such as MSDS, RoHS, ISO 9001, QC080000, IATF 16949, ISO 14001, or ISO 27001, our sales engineers are ready to assist you.