Product Overview
40mm x 13.4mm x 3mm nickel-plating bar magnets
These nickel-plating bar magnets are highly versatile and perfect for both DIY tasks and industrial uses. Whether organizing tools, fastening panels, or creating custom assemblies, their strong magnetic grip ensures stable, reliable performance. They're frequently used in engineering, aerospace, and construction for precise alignment and firm-holding power. Ideal for both casual and professional users, these magnets offer a flexible solution across a wide range of applications.
Material Neodymium (NdFeB)
|
Product Name |
nickel-plating bar magnets |
|
Magnetic Grade |
N42SH (Br ≥ 13.4 kGs, Hcj ≥ 12 kOe) |
|
Dimensions |
L40mm x 13mm x 3mm (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) |
Manufacturing Process
Final magnetic performance is determined by both material system and manufacturing process.
- Sintered process for high energy product
- Oriented pressing for anisotropic structure
- Density control to minimize performance variation
- Magnetization scheme aligned with magnetic circuit design
Appearance & Dimensional Inspection
Appearance and dimensional inspection ensures that NdFeB magnets meet surface quality and size accuracy requirements.
- Check for cracks, chips, surface defects, and coating damage
- Verify coating coverage and surface uniformity
- Measure key dimensions to confirm compliance with drawings and tolerances
- Inspect edge quality and overall geometry
Packaging Process for NdFeB Magnets
Magnets are inspected for dimensions, coating condition, and magnetic properties prior to packaging
Non-magnetic separators are placed between magnets to prevent direct contact and magnetic impact
Products are sealed in moisture-resistant plastic bags with desiccants to reduce oxidation risk
Inner packaging uses foam or cushioning materials to prevent movement and vibration
Outer cartons are reinforced and labeled; magnetic shielding is applied when required for transport
Usage and Handling Precautions
- NdFeB magnets are brittle and may crack under impact or compression
- Avoid sudden attraction between magnets, which may cause damage or injury
- Do not use magnets beyond their specified operating temperature
- Keep magnets away from electronic devices and magnetic-sensitive items
- Store in a dry, clean environment to maintain surface coating integrity
FAQ
Q1. What is the acceptable magnetic flux loss limit after thermal cycling?
Acceptable limits are defined by application requirements, but typically irreversible flux loss is controlled within 1–5% after thermal cycling for high-reliability applications.
Q2. How is oxygen content controlled and verified during production?
Oxygen content is monitored during powder preparation and sintering using oxygen analyzers. Strict control prevents oxidation that can degrade magnetic properties and long-term reliability.
Q3 How is coating thickness measured and controlled?
Coating thickness is measured using X-ray fluorescence (XRF) or magnetic thickness gauges. Uniform thickness ensures consistent corrosion protection without affecting dimensional tolerances.
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