Can the magnets be shipped by air?
Absolutely, and multiple times too. Our magnets conform strictly with IATA's packing instruction 953, and are NOT classified as dangerous goods when shipped in original tool cases. Read more about the regulations here (external page). Our magnets, in original tool cases, belong to this category: "If the maximum field strength observed at a distance of 2.1 m (7 ft) is less than 0.159 A/m (0.002 gauss) or there is no significant compass deflection (less than 0.5 degree), the article is not restricted as a magnetized material."
How is the holding force rating defined?
Every single magnet is tested at the factory to ensure that the holding force is well above the rating. This is measured by pulling the magnet perpendicularly from a 30mm thick, clean mild steel plate. Out in real life, the holding force will be affected by steel thickness, steel quality, and gap between magnet and steel which may be caused by rust or uneven steel surfaces.
What is the lateral holding force?
There is no definite answer to this, because it depends on the friction coefficient between the magnet and surface. Important factors are paint, marine growth, corrosion, wet or dry. As a rule of thumb, you can assume 20-30% of the normal holding force rating.
Will the magnets demagnetize?
Our magnets don't demagnetize, as long as you keep the magnets below 100 degrees Celsius (212 Fahrenheit) and follow the instructions in the user manual.
Will you do custom designs?
Yes, of course. We control all aspects of the design and magnetic calculations. Send us an e-mail with some specifications, and we'll get right on it.
Utkast: 500/800 kg seems like a lot. Isn't it dangerous? Difficult to remove? What about damage to the hull or equipment inside?