What is the holding force of a magnet?
Force is calculated by F = 0.577 * B^2 * A where B is the flux density in the gap in kG, and A is the magnet area in square inches. For round or rectangles shapes, use current sheet calculations to estimate B in the gap, or at the end of the magnet. These equations are available in uner the Tools section of the navigation bar on our Web site. They can also be found in ourReference and Design Manual, availabel for download under our Engineering Support section. If the magnet is in contact with steel, double the magnet length since the steel will mirror the magnet’s properties. For round or rectangles some distance off a steel keeper, use current sheet equations to calculate flux at half the separation distance. This is a ballpark calculation and empirical values are usually higher.
