Will Drilling Holes Weaken Magnet Strength

Drilling a hole in the middle of a round magnet will definitely weaken its magnetic force. Drilling reduces the magnet material, weight and effective adsorption area, resulting in a decrease in overall attraction force.

Many customers do not know that although the material used for drilled magnets is reduced, manufacturers will still include the cost of intermediate waste in pricing, plus additional drilling process costs, eventually leading to increased cost and decreased attraction force. Therefore, unless necessary, secondary processing such as drilling holes in magnets is not recommended.

Some products must be fixed with countersunk screws in the middle, so drilling structure is the only option. To maintain the original attraction force, there are two feasible solutions: first, improve the magnet performance grade and use higher-grade materials to compensate for the attraction force; second, increase the outer diameter of the magnet to increase the total contact area and make up for the attraction loss caused by drilling.

Drilled magnets are commonly used in fixed installation, module assembly, mechanical accessories and other scenarios. Reasonable design of size and performance can balance structural requirements and magnetic performance.