Hobby Neodymium Rare Earth Super Ring Magnet 20 x 4mm (13/16 x 5/32 in.)

This 20mm x 4mm Neodymium Rare Earth Super Magnet is ring shaped with a 5mm center hole that is conical on one side so it can be mounted perfectly with a screw. Much stronger than conventional ceramic magnets and plated in bright nickel for extra durability.

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Last Updated: 05/18/2024




Use one of these Super Strong Neodymium Rare Earth Magnets for hobby projects where you want a ring shape that can be mounted with a screw to a wall or box or attached with thread through the center hole! With permanent magnetic strength and bright nickel plating to prevent chipping, these magnets are a great fit for most hobby projects. 20mm in diameter and 4mm tall with a 5mm center hole, these ring magnets are useful for creating strong connections without gluing or fastening. Couple one of these with our Magnetism Sensor / Reed Switch for a nice proximity sensor such as you'd find in the lid of a box used to detect if it is open/closed.


  • Shape: Ring
  • Plated with Bright Nickel for Added Durability
  • Very Powerful Magnet with Permanent Magnetic Strength
  • Material: Rare Earth (Neodymium)
  • Rating: N50
  • Exact Dimensions:
    • Outer Diameter: 0.787" (20mm)
    • Inner Diameter: 0.197" (5mm)
    • Height: 0.157" (4mm)


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