1. Magnetic pull force was tested using a computer tensile tester. Actual traction force will vary mainly depending on the following variables:
A: steel thickness: the thinner the steel, the lower the pulling force. The vertical magnetic pulling force was obtained on the basis of the 30mm thickness of the steel plate.
B: direction of extrusion: the greater the direction of extrusion is at 90deg, the lower the extrusion force, usually the extrusion force in the horizontal direction is only about one-third of that in the vertical direction.
C: attracting position: the farther from the center of gravity, the lower the pulling force.
In addition, the iron chips of the magnetic surface also reduce the pull force of the magnet to some extent.
2. Magnet only attracts iron, ferrous metal, and nickel does not attract gold, silver, copper, aluminum, and their alloy and stainless steel.
3. The magnetic force concentrates on the bottom of the fishing magnet, there is almost no magnetic force on other surfaces.