N30 Round Neodymium Magnet 12mm x 3.5mm

N30 Round Neodymium Magnet 12mm x 3.5mm
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  • Product Code:SQ3069
  • Availability: 1000
  • $0.06
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Tags: N30 magnet, neodymium magnet, round magnet, disc magnet, rare earth magnet, strong magnet

The N30-Round-12x3.5MM is a sintered neodymium-iron-boron (NdFeB) disc magnet with a grade N30 energy rating. It measures 12 mm in diameter and 3.5 mm in thickness, offering a compact form factor that fits into small assemblies while still providing substantial magnetic holding force. The magnet is axially magnetized through its thickness, meaning the north and south poles are located on the two flat circular faces. Its surface magnetic flux density at the center is approximately 4000 Gauss, which is typical for a magnet of this size and grade. Neodymium magnets are the strongest type of permanent magnet available commercially, and N30 sits in the lower-middle range of the N-series grades, offering a practical balance between magnetic strength and cost.
This NdFeB magnet is suitable for craft projects, sensor triggering, small motor assemblies, magnetic holders, and educational demonstrations. Because sintered NdFeB is brittle and prone to corrosion, the magnet is typically supplied with a protective Ni-Cu-Ni plating, although the Aftab Rayaneh page does not explicitly list the coating. Users should avoid exposing the magnet to temperatures above the maximum operating limit for the N30 grade and should handle it carefully to prevent chipping.
Note: Due to slight variations in the manufacturing process, the thickness of the magnets may differ slightly; it is possible that not all magnets are identical.

N30 Round magnet Application

  1. Craft and DIY projects requiring small strong magnets
  2. Sensor triggering in Hall-effect and reed switch circuits
  3. Small motor and generator assemblies
  4. Magnetic holders, clamps, and fixtures
  5. Educational demonstrations of magnetic fields
  6. 3D printer bed adhesion and accessory mounting

N30 Round magnet Specifications

  1. Model: N30-Round-12x3.5MM
  2. Material: Sintered NdFeB (neodymium-iron-boron)
  3. Grade: N30
  4. Shape: Round disc
  5. Dimensions: 12 mm diameter × 3.5 mm thickness
  6. Magnetization Direction: Axial (through thickness)
  7. Surface Flux Density (Center): Approximately 4000 Gauss
  8. Residual Induction (Br): 1.08–1.15 T (typical for N30, per industry data)
  9. Coercivity (Hcb): ≥ 796 kA/m (typical for N30)
  10. Intrinsic Coercivity (Hcj): ≥ 955 kA/m (typical for N30)
  11. Maximum Energy Product (BHmax): 223–247 kJ/m³ (typical for N30)
  12. Maximum Operating Temperature: 80°C (standard N30 grade)
  13. Curie Temperature: Approximately 310°C (typical for NdFeB)
  14. Surface Coating: Ni-Cu-Ni (typical for sintered NdFeB; not explicitly listed on the Aftab Rayaneh page)
  15. Density: Approximately 7.5 g/cm³ (typical for NdFeB)
Physical Parameters
Size 12mm x 4mm
Material NdFeB
Environmental Conditions and Safety
Operating Temprature 80°C

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