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20mm Dia x 5mm with 4mm hole | Pack of 4

Regular price $30.00

Tax included.

Product Details

Size: 20mm diameter x 5mm thick with 4mm countersunk hole for mounting

Quantity: 4

Grade: N45 Neodymium

Pole location:  Poles on flat faces. 2 with north pole countersunk, 2 with south pole countersunk, so they can attract or repel.

Pull/Push: About 8kg to another magnet or 2.4mm sheet steel. 12kg if stacked in pairs. Resistance to sliding is about 1/3 that.


  • About 10 times more pull than the traditional, grey, ferrite type
  • This type of magnet never weakens with age
  • Triple plated for durability: Ni/Cu/Ni

Potential Uses:

  • Simple mounting without adhesive
  • Attaching items firmly to steel surfaces
  • Tool holders
  • Door closures. One facing another, or faces gliding past without touching
  • Secure display of work-site documents. (Attach to a short dowel for easy handling)
  • Industrial fixtures


  • Not for kids! Two or more, if swallowed, can lethally puncture gut tissue.
  • They can pinch skin and cut clothing.
  • The material is brittle. It can chip or break during collisions. Eye protection advised.
  • For credit cards, pacemakers etc, keep at a distance where the field is negligible.


  • Dangerousmagnets is your helpful & reputable source for amazingly strong Neodymium Magnets. (Also called Rare Earth Magnets.)
  • Genuine NZ trader in Auckland, trading with scrupulous honesty, specialising in Neodymium Magnets since 2009.
  • Unequalled 5000+ positive feedback for magnet sales in Trademe.
  • Over 45 sizes.
  • I don't sell China's cheapest neodymium magnets. I have found them substandard and with fake "certification".
  • Qualified mechatronics engineer with practical experience.
  • I am happy to help you find the best solution for your application.
  • Visits welcome by appointment. Bring your application to investigate solutions.
  • You're welcome to change your order to 2 half-packs &/or add half-packs. Just ask by email.
  • Combine shipping.
  • Quantity discounts. Please ask by email.
  • Send purchase orders to sales@dangerousmagnets.com