2.5mm x 3mm Neodymium Round Magnet

Specifications

• Magnet Material: Neodymium (NdFeB)
• Shape: Disc / Cylinder
• Diameter: 2.5mm
• Thickness: 3mm
• Coating: Ni-Cu-Ni (Triple Layer Nickel)
• Maximum Operating Temperature: 80°C

Unlock New Capabilities

• Past Projects If you've already experimented with standard 10mm or 15mm disc magnets to create simple removable panels or basic latches, you know how bulky traditional magnets can be — which means you're perfectly ready to graduate to embedding micro-magnets into high-precision designs.
• Feature Upgrade This 2.5mm x 3mm Neodymium Disc Magnet unlocks the ability to build invisible magnetic clasps in miniature 3D printed enclosures, create ultra-compact quick-release joints for micro-robotics, and precisely trigger tiny SMD Hall effect sensors (like the A3144 or DRV5053) without bulky magnetic interference. These are high-tolerance, micro-mechanical setups you simply cannot achieve with standard ceramic magnets or larger neodymium discs.
• Effort Level & Minimum Hardware
•  Effort Level: Intermediate

Minimum hardware to get started:

• Cyanoacrylate (Super Glue) or Epoxy: required to permanently secure these tiny magnets inside your 3D printed recesses or models, as they are too small for mechanical fasteners.
• Precision ESD Tweezers: essential for handling and positioning these 3mm discs, as they are extremely difficult to manipulate with bare fingers.

Package Includes

• 1 × 2.5mm x 3mm Neodymium Round Magnet 

Frequently Asked Questions

• Are these magnets compatible with 3D printed PLA and PETG enclosures?
  Yes, they are perfectly sized to be embedded inside printed plastics or glued into custom-designed recesses.
• Will this tiny magnet trigger a standard Hall effect sensor?
  Yes, the focused magnetic field is strong enough to reliably trigger most SMD and through-hole Hall sensors like the A3144 at close range.
• Can I use this magnet to stick things to an aluminum chassis?
  No, neodymium magnets only attract to ferrous metals such as iron, steel, and nickel, not aluminum or copper.
• Do these work well with miniature magnetic reed switches?
  Yes, they provide an excellent, compact magnetic field ideal for opening and closing tiny glass reed switches in security or automation projects.
• Is one magnet strong enough to act as a cabinet door latch?
  No, this 3mm size is meant for miniature models and lightweight 3D printed boxes; you would need a larger 10mm or 15mm disc for heavy cabinet doors.
• What kind of glue should I use to mount these magnets?
  Cyanoacrylate (Super Glue) or a strong two-part epoxy works best for bonding the nickel-plated surface to plastics or wood.
• Can I solder connecting wires directly to the magnet's surface?
  No, applying soldering iron heat will permanently destroy the magnetic properties of the neodymium core.
• Is the magnet safe to use outdoors in wet conditions?
  The triple-layer nickel coating offers good resistance, but prolonged exposure to moisture can cause the internal raw neodymium to rust if the coating is scratched.
• Can I use these inside a high-temperature 3D printer enclosure?
  Standard neodymium magnets lose their magnetism permanently if exposed to ambient temperatures exceeding 80°C.
• Why did my magnet shatter into pieces?
  Neodymium is a sintered and highly brittle material; allowing two magnets to snap together violently from a distance will often cause them to crack.