The tricky thing with magnet design is that the pull strength rating kinda means nothing… many magnets designed for lifting heavy weights and such are designed to maximize paramagnetism in metals that span the entire length and width of the magnet, effectively forming a field guide and “completing” the “circuit” magnetically… this why those door holding / securing magnetic bars can hold with so much force but only pull like 500mA to do it… the design takes huge advantage of the metal bar that contacts the magnetic surface. The actual field strength of the magnet itself is quite weak until the metal bar is aligned properly across it and then it will take 3500 pounds of force to separate them.
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