Dimensional accuracy is directly related to the degree of fit between the screw and the screw hole. If the accuracy of the screw's diameter is insufficient, it may result in either an excessively large or small gap between the screw and the screw hole. When the gap is too large, the screw will become loose within the screw hole and fail to provide adequate fastening force. During the operation of electronic devices, components may shift due to vibrations and other factors, affecting the stability and reliability of the device. In extreme cases, it may even cause damage to electronic components. For example, when installing a computer motherboard, loose screws can lead to poor contact between the motherboard and the chassis, thereby affecting the normal functioning of the circuit. Conversely, if the gap is too small, it will be difficult to insert the screw into the hole. Forcing the screw in may damage the threads of the screw or the hole, also preventing reliable fastening.

Precise dimensions are crucial for accurately controlling the tightening torque of the screw. Inconsistent dimensional accuracy of screws means that when the same torque is applied, different screws will achieve different levels of tightness. Some screws may be tightened too much, exceeding the material's load - bearing limit and causing deformation or even damage to the connected parts. Others may not be tightened sufficiently to achieve the desired fastening effect. For instance, in precision electronic instruments, extremely high requirements are placed on screw torque control. Deviations in dimensional accuracy can affect the instrument's performance and prevent it from reaching the designed precision.

In applications where electrical performance is required, such as grounding screws, dimensional accuracy can influence the electrical conductivity. If the dimensional accuracy of the screw is insufficient, it may lead to a reduction in the contact area between the screw and the connected part, increasing the contact resistance and thus affecting the reliability of the electrical connection. For example, in an automotive electronic system, poor contact of the grounding screw can result in electrical failures and impact the normal operation of the vehicle.

Electronic screws with high dimensional accuracy can enhance assembly efficiency. When the dimensional accuracy of screws is consistent, assembly workers can insert the screws into the holes more quickly and accurately, reducing the time spent on rework and adjustments due to improper dimensions. On the contrary, if the dimensional accuracy of the screws is poor, more time may be required during the assembly process to select suitable screws or to modify the screw holes. This reduces production efficiency and increases production costs.

For electronic devices with high - standard appearance requirements, such as mobile phones and tablets, the dimensional accuracy of the screws affects the overall appearance and structural integrity of the device. Inaccurate screw dimensions may lead to a mismatch between the screw head and the mounting hole, causing the screw head to protrude or sink, which impairs the device's aesthetic appeal. Additionally, it may also affect the device's sealing performance, making the device more susceptible to external factors such as dust and moisture and reducing its service life.