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Screwing PCB board is a common and reliable method for fixing PCB board. In the structural design of electronic products, the fixation of PCB board is crucial, which not only affects the performance of the product, but also relates to production efficiency and maintenance convenience. Screw fixation has become a widely used fixing method due to its high reliability and drop resistance.

Key parameters and design requirements
Screw hole size:
The diameter of the screw hole should be 0.1-0.2mm larger than the outer diameter of the screw to ensure fixation and avoid assembly difficulties;
Countersunk screws need to be adapted to specific countersunk holes to maintain surface flatness.

Screw selection:
Priority should be given to using cylindrical head screws (with deep grooves and strong anti slip ability), and spherical cylindrical head screws are recommended for larger tightening forces;
For scenes that require high positioning accuracy, it is necessary to use positioning columns to assist in limiting.
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Structural adaptability:
When multiple PCBs are stacked and fixed, layer by layer fixation can be achieved using rivet or copper screws;
The force concentration area (such as USB interface) needs to be reinforced with fixed design.
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Technological advantages and applicable scenarios
Reliability: Screw fixation can effectively resist falling impact and ensure the stability of the product in harsh environments;
Maintenance convenience: The detachable design facilitates repair and component replacement;
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Applicable scenarios:
Products that require carrying high-power components such as heat sinks and motors;
Industries such as industrial equipment and automotive electronics require high vibration resistance.
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Technical limitations and improvement directions
High cost: additional materials (screws, positioning posts) and manual operation are required, and the applicability of small products (such as TWS earphones) is limited;
Space occupancy: Screw fixation requires reserved assembly space, which may affect the lightweight design of the product.