20mm x 12mm x 6mm Neodymium BAR Magnet

Specifications:

• Material: Neodymium-Iron-Boron (NdFeB)
• Grade: N35
• Shape: Rectangular Bar
• Dimensions: 20mm × 12mm × 6mm (L × W × H)
• Plating/Coating: Ni-Cu-Ni (Nickel-Copper-Nickel)
• Magnetization Direction: Through the thickness (6mm)
• Max Operating Temperature: 80°C / 176°F

Applications

• Robotics & Kinematics: Creating quick-release joints, snap-fit chassis lids, and detachable robot arms.
• Sensor Triggering: Acting as the magnetic target for Hall Effect sensors (like the A3144) to build custom RPM counters, limit switches, and tachometers.
• Smart Home & Security: Invisible cabinet locks, magnetic door sensors, and tamper-detection switches.
• 3D Printing & DIY: Embedding into PLA/PETG prints mid-print to create hidden, seamless magnetic latches without visible hardware.
• Industrial Mounting: Heavy-duty tool holding and temporary fixture alignment on metal workbenches.

Unlock New Capabilities

• If you've already experimented with basic 3D-printed friction-fit joints, standard ferrite magnets, or bulky mechanical latches, you already understand the limitations of weak or space-consuming joints — which means you're perfectly ready to upgrade to high-strength magnetic locking.
• This 20x12x6mm Neodymium Magnet unlocks reliable snap-fit robotics enclosures, invisible hidden latches for smart home control panels, high-clearance Hall effect sensor triggers, and heavy-duty tool mounting. These are builds you simply cannot achieve reliably with standard black ceramic magnets.
• Effort Level: Beginner

Minimum hardware to get started:

• Strong Adhesive (Epoxy or Super Glue): to securely bind the smooth, nickel-plated surface of the magnet to your 3D-printed chassis or acrylic enclosure, as standard craft glues will peel off.
• Non-magnetic tweezers/spacers (optional): to safely position the magnet during gluing without it violently snapping to your metal tools.

Package Includes

• 1 x 20mm x 12mm x 6mm Neodymium BAR Magnet 

Frequently Asked Questions

• Is the 20x12x6mm Neodymium Magnet compatible with 3D printed PLA and PETG parts?
  Yes, it can be easily embedded into 3D printed slots or glued using cyanoacrylate adhesive.
• Can I use this magnet to trigger a Hall Effect sensor on an ESP32 or Arduino?
  Yes, its strong magnetic field is perfect for reliably triggering A3144 or similar Hall effect sensors.
• Will this magnet work for outdoor enclosures?
  Yes, the triple-layer Ni-Cu-Ni plating provides good corrosion resistance, though prolonged exposure to direct moisture should be avoided.
• Can I use multiple 20x12x6mm magnets together to increase the holding force?
  Yes, stacking them will increase the overall pull strength, though the increase is not strictly linear.
• Does this magnet require any power to operate?
  No, it is a permanent rare-earth magnet and requires no electrical power.
• What is the maximum operating temperature for this N35 magnet?
  The maximum safe operating temperature is 80°C, above which it will begin to irreversibly lose its magnetism.
• Does the magnet conduct electricity?
  Yes, the nickel plating and the NdFeB material are highly conductive, so ensure it does not short out exposed PCB traces.
• How do I securely mount the 20x12x6mm magnet to an acrylic sheet?
  Use a two-part epoxy or strong cyanoacrylate (super glue) after lightly scuffing the acrylic surface for better adhesion.
• Can I drill a hole through this neodymium magnet for a screw?
  No, neodymium is extremely brittle and drilling will cause it to shatter and lose its protective plating.
• How do I determine which side is the North pole?
  You can use a smartphone magnetometer app, a standard compass, or another clearly marked magnet to identify the poles.
• How far away can this magnet trigger a standard reed switch?
  Depending on the switch's sensitivity, this strong 6mm thick magnet can typically trigger it from 15mm to 25mm away.
• Can I use this magnet for a DIY rotary encoder or RPM counter?
  Yes, mounting this magnet on a spinning wheel paired with a Hall effect sensor makes an excellent, wear-free RPM counter.
• Is there a specific orientation required for Hall effect sensors?
  Yes, unipolar Hall effect sensors will only trigger when exposed to the correct magnetic pole (usually the South pole).