Why Does the Tip “Stick” to the Screw? A Video Explanation of Magnetization—Jiuju Magnetizing Machine

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The bit is able to securely “hold” the screw not because the material is naturally magnetic, but as a result of a specialized magnetization process. Screwdriver bits are typically made of alloy steel, which inherently possesses some residual magnetism. During magnetization, the bit is placed in a strong pulsed magnetic field, causing the internal magnetic domains to align axially. Once the external magnetic field is removed, the bit retains a stable magnetic field, enabling it to attract iron screws. The precision of the magnetization process directly determines the holding force and the duration of magnetization. Insufficient magnetization energy results in weak magnetic force and susceptibility to demagnetization; conversely, excessive energy may compromise the bit’s hardness and durability. Different bit specifications require corresponding parameters to ensure uniform and long-lasting magnetic force. Jiuju’s automatic screwdriver bit magnetization equipment enables continuous batch processing with precise and controllable magnetization parameters. Equipped with a magnetic force detection module to verify adhesion performance, it ensures consistency across magnetization batches and meets the quality requirements for large-scale production of hardware tools.

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Video on Automatic Magnet Magnetization—Jiuju Magnetizer

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Magnetization itself is a physical process that takes place in milliseconds; what truly slows down the overall production cycle are the manual loading, unloading, and alignment and calibration steps. In manual magnetization mode, workers must pick up and place each part individually and verify the polarity direction, which takes several seconds per part. Production capacity fluctuates significantly depending on the workers’ skill level and fatigue, and the strong magnetic field environment also poses safety hazards.