Product Overview
The 12×3 mm neodymium magnet is a small, high-strength disc magnet made from sintered Nd–Fe–B (rare-earth) material. Its compact size and predictable magnetic behavior make it useful in a range of industrial and mechanical assemblies where designers need strong, stable magnetic force in a minimal footprint.
Unlike larger magnets that may require extra housing space, this size can be integrated into compact modules such as micro motors, sensors, and positioning fixtures without significant redesign of enclosure geometry.
Material and Fabrication
These magnets are manufactured from sintered neodymium iron boron - a material chosen for its high magnetic energy relative to volume. The standard magnetization direction for this geometry is axial (through the 3 mm thickness), which simplifies mounting and design for many planar magnetic circuits.
Surface protection is typically achieved through nickel-copper-nickel (Ni–Cu–Ni) plating, which offers basic resistance to corrosion and handling wear. In environments with higher moisture or chemical exposure, alternative coatings (such as epoxy or zinc) can be specified.
Dimensions & Tolerance
- Shape: Disc
- Diameter: 12 mm
- Thickness: 3 mm
- Material: Sintered NdFeB
- Grade Options: N35–N52 (selected based on force and temperature requirements)
- Magnetization: Axial through thickness (standard)
- Operating Temperature: Typical service up to ~80 °C; higher temp grades available on request
Dimensional tolerances are controlled in production to support automated assembly processes. If your design requires particularly tight tolerances (for example, automated pick-and-place systems), specify this at enquiry stage.
Practical Use Cases
Magnets of this size are frequently deployed where small physical size and notable magnetic output are both needed:
- Micro motor rotors and stators
- Hall effect and magnetic sensors
- Magnetic catches and retention in tight spaces
- Fixtures and tooling for small parts
- Magnetic assemblies in automation and robotics
- Prototyping and R&D modules
Because the size is small, these magnets are often used in clusters or paired configurations to achieve the required holding or force profile.
Procurement & Customization
We support bulk supply for production orders and can tailor magnet grade, coating and magnetization direction to your application. Typical process:
- Provide specification or drawing (geometry, tolerance, environment).
- Receive samples for fit and performance testing.
- Confirm details and schedule production.
- Delivery with appropriate packaging and optional test documentation.
Sample quantities are available for initial evaluation before committing to larger volume orders. For OEM projects, we can also provide batch inspection reports covering magnetic flux, dimensional checks, and coating verification.
Installation and Handling Notes
- Handle small magnets with care; keep fingers and tools clear to avoid pinching.
- Ensure compatible mounting surfaces; for bonded applications use adhesives suited to your temperature range.
- Account for coating thickness in tight mechanical fits.
FAQ
Q: Can this 12×3 mm magnet operate in higher temperatures?
A: Yes - select higher-temperature grades and appropriate coatings if operating conditions exceed ~80 °C.
Q: Does the plating significantly affect performance?
A: Plate thickness adds minimal spacing and does not meaningfully impact magnetic force in typical use.
Q: Can I get samples before a bulk purchase?
A: Yes - samples are available for testing and verification before placing a larger order.
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