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Dangerous Magnets Ltd is your helpful & reputable source for incredibly strong neodymium magnets that never weaken with age.

- Keep from young children! If two or more are swallowed they can be lethal, by attracting across gut tissue and puncturing it.
- The material is brittle so it can chip or break if magnets crash together. Eye protection advised.
- Magnets can pinch skin and cut clothing. Larger ones, or smaller ones in large groups, can crush fingers.
- For sensitive devices (e.g. credit cards, pacemakers, magnetic recording), keep at a distance where the field is negligible.


This is a pack of 4 massively powerful, neodymium "rare earth" magnets.

Dimensions: 20mm diameter by 5mm thick, with a 4mm countersunk hole that takes #6 self-tapping screws. (Hardware stores or on-line from Steelmasters.)

Strength rating: N45. (N35, currently auctioned as N45 elsewhere on Trademe, is significantly weaker). These neodymium magnets are about 10 times more powerful than similar size ferrite magnets.
They have a direct pull to each other, or 2.4mm sheet steel, of about 8 kg. More if you stack them. 18 kg if between 2 steel sheets.
(Resistance to sliding is about 1/3 the direct pull)

Countersinking: Two on the North side; two on the South side, so you can mount them to either attract or repel each other.
This makes them ideal for quiet-close doors, one magnet in the top edge of the door, and one off-set under under the top of the jamb. For stronger, use 2 pairs or stack them. Or see my D25x6mm.

Potential Uses
- Latches & closures, eg for cupboards & doors.
- Attaching products for commercial display.
- Attaching items firmly to steel surfaces.
- Clamp components while gluing.
- Locating studs
- Industrial fixtures.

For our many other sizes of magnet, click "Sellers Other Listings" or search “Dangerousmagnets”. For a list without duplications, Please read the questions and answers for this listing.
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Shipping options

  • Courier. All Fastway Rural Delivery, incl Auck.$12.00
  • Courier. Nationwide - Non Rural Delivery$6.00
  • Pickup, from the Onehunga end of Hillsborough$0.00
  • Additional item (= or higher courier already paid)$0.00
  • PO Boxes, i.e. DON'T! Courier cannot deliver.$50.00
  • Seller allows pick-ups
  • Seller location: Auckland City, Auckland, NZ

Payment options

  • Other options
    Cash, NZ bank deposit

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