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Pull Strength on Steel for a Cylinder

This calculation estimates the pull strength on steel for a cylinder.

Note that effective magnetic length is two times actual length for straight line materials in contact with steel, thus the permeance coefficient increases when in contact. Note that the poles of Alnico magnets are not at the magnet ends except when magnetized in a closed circuit. When removed from the magnetizing yoke, the poles move inward and the poles will never return to the end when placed on steel.

Residual Induction (Br) data is on our magnet material pages.