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Dangerous Magnets Ltd is your helpful & reputable source for incredibly strong neodymium magnets THAT NEVER WEAKEN WITH AGE.

I am a scrupulously honest trader.


- The material is brittle and will chip or break if magnets crash together. Eye protection advised.
- Neodymium magnets can pinch skin, cut clothing, even crush fingers.
- For sensitive devices, e.g. credit cards & pacemakers, keep at a distance where the field is negligible.


Neodymium magnets are about 10x stronger than traditional magnets.

This is a single magnet, 40mm diameter, 10mm thick, with 4.3 mm countersunk mounting hole.

Strength Rating: N45. Many magnets sold in NZ are N35 grade or lower, and are significantly weaker. I have bought CHEAP N45 neodymium magnets from China which were definitely weaker than stated, so I have selected a supplier who is honest about the grade and quality of these neodymium magnets.

Pull: To 4mm+ thickness of smooth, flat steel: about 31kg. Between two steel plates: 63 kg!
Stack in pairs, i.e. 20 mm thick, and the pull to 4.3 mm steel plate is around 52 kg! In threes to 6 mm plate, 69 kg.
Beware... The more pull, the more danger!

Is this too strong? consider my 12+ other sizes of mountable neodymium magnet, or glue 1 or 2 mm thickness of a non-magnetic material to the flat, pole surface.

Excellent for securely attaching all manner of fixtures to plate steel, or holding a heavy door or gate open or closed. (For outdoor use, seal against weather.)

This size, and our 50x25x12 mm block magnets are suitable for making "sweeper" magnets, for removing steel contamination. Attach a series of them, all countersinks uppermost, to one side of a flat, steel bar, say 1-2cm apart, and enclose the assembly in a non-magnetic housing, say plastic down-pipe or stainless steel channelling.

For my 45& other sizes of magnet, click "Sellers Other Listings" or search “Dangerousmagnet”. For a more structured list without duplication:
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Farming checklist
  1. Broadband for rural NZ is here. Find out more
  2. Get rural insurance from a specialised rural insurer

Shipping options

  • Courier. All RURAL DELIVERY, including R.D. Auck.$14.00
  • Courier. Nationwide - Non Rural Delivery$8.00
  • 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

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    Cash, NZ bank deposit

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