Round NdFeB magnet with hole

1. Product Overview

The round Ndfeb magnet with hole is an innovative composite magnetic structure that embeds a high-performance neodymium (NdFeB) magnet into a high-quality steel shell. This design combines the strong magnetic properties of the magnet with the mechanical protection of the steel housing. The central mounting hole allows for easy and secure installation using screws or bolts, greatly improving integration in various structural systems. Thanks to the steel casing’s magnetic guidance and shielding, this product concentrates magnetic force on the working surface, achieving stronger holding power and higher efficiency. Additionally, the outer steel shell effectively protects the magnet core from impact, edge chipping, and environmental corrosion, significantly extending the product’s service life.

 2. Technical Parameters

- Product Name: Round Ndfeb magnet with hole

- Magnet Grade: N50M (Br ≥ 14.6 kGs, Hcj ≥ 14 kOe)

- Product Dimensions: L12 × 4 × 2 mm

- Dimensional Tolerance: ±0.05 mm in length, width, and thickness

- Working Temperature: ≤ 100°C (custom high-temperature versions available)

- Density: ≥ 7.5 g/cm³

- Surface Magnetic Field: 4500 Gauss (single magnet)

- Magnetic Flux: 1.80 mWb (measured with fluxmeter)

3. Manufacturing Process

- Magnetic Field Orientation Molding: Magnetic powder is filled into mold cavities and oriented under a strong pulsed magnetic field to significantly enhance magnetic performance.

- Hole Machining Techniques:

- Centerless Grinding: Diamond wheels grind the outer and inner diameters to improve dimensional accuracy and surface finish.

- Wire EDM Cutting: Fine wire cuts conductive materials via pulsed electrical discharge, ideal for complex shapes and precision holes.

4. Surface Treatment & Coating

- Full Epoxy Encapsulation: Epoxy resin is injected into the structure to enhance mechanical strength and waterproof properties.

- Nickel Plating (Ni-Cu-Ni): Triple-layer electroplating provides excellent resistance to rust, corrosion, and abrasion.

5.Appearance & Dimensional

- Manual measurement with micrometers/calipers

- Visual inspection under 800–1200 lumen lighting

- 2D optical measurement for irregular shapes

- CCD automated sorting for full inspection

- Magnetic flux testing to ensure batch consistency

6. Reliability Testing

- Temperature Test: Thermal cycling between -40°C and +80°C to observe changes in magnetic and physical properties.

- Humidity Test: Exposure to >90% RH to check for rust, corrosion, or magnetic degradation.

- Salt Spray Test: Simulates harsh environments like coastal areas to assess corrosion resistance.

7. Packaging Process & Instructions

- Visual and dimensional defect screening

- Magnetization and neat alignment of qualified products

- Boxed by quantity per customer request, with custom labeling

- Vacuum packaging with magnetic shielding and shock-absorbing padding

8. Application Fields

Automation & Machinery:

- Magnetic grippers for robotic arms

- Conveyor positioning modules

- Quick-installation modules

Architecture & Interior:

- Invisible fixing of metal panels

- Fast installation of ceiling or magnetic lighting

- Removable hanging plates and magnetic door latches

Electronics & Electrical Industry:

- Trigger magnets for Hall sensors

- Magnetic cabinet latches

- Internal magnetic components in locks and switches

9. Usage Precautions

- Avoid impact and dropping; NdFeB material is brittle and fragile

- Prevent finger injuries by sliding magnets apart instead of pulling

- Ensure correct polarity during installation for stable performance

- Store in dry, non-corrosive environments away from heat and moisture

- Keep away from sensitive equipment such as pacemakers, HDDs, and IC cards

10. Customization & Services

- Customizable parameters: size, shape, magnetic orientation, coating thickness

- Laser marking of logos or serial numbers available

- Sample testing, pull-force testing, and custom packaging solutions provided

- Certification support: MSDS, RoHS, ISO9001, IATF16949, etc.

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11. Why Choose Jinconn Magnet

11.1 Company Overview

Dongguan Jinkun New Materials Co., Ltd. specializes in the research, development, production, and sales of high-performance magnetic materials. Guided by the philosophy of "Technology as the foundation, Quality as the soul," the company is committed to becoming a global leader in magnetic material solutions.

Our products are widely used in new energy vehicles, intelligent manufacturing, electronic communications, automation equipment, and medical devices, earning the trust of customers both domestically and internationally. Looking ahead, we will continue to be driven by customer needs, promote technological innovation and industry integration, support the advancement of the global smart industry, and strive to become a benchmark enterprise and strategic partner in the magnetic materials sector.

11.2 Corporate Culture

We are dedicated to providing magnetic material solutions across various industries, including new energy vehicles, intelligent manufacturing, and electronic communications. With leading technology and assured quality, we have gained the trust of clients worldwide.

In addition, we offer free customized magnet design solutions to meet your specific application needs. Please feel free to contact us!

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.