Do self-tapping screws serve as replacements for standard screws, nuts, or original hardware?

Self-tapping screws have a specific design intended for creating their own threads in materials, usually in softer substrates like plastic or thin metal. They differ from standard screws that require pre-drilled holes and typically rely on nuts or washers for fastening, especially in structural applications where strength and reliability are paramount.

Because self-tapping screws establish their own threads, they may not provide the same strength, torque, or security as bolts paired with nuts or equivalent original hardware designed for heavy-duty applications. In various structural and aviation contexts, using the correct type of hardware is crucial for ensuring safety and compliance with engineering standards. Regular screws and nuts are used because they are tested and specifically rated for certain loads, which self-tapping screws may not match in many instances. Therefore, while they can be convenient for minor repairs or light applications, relying on self-tapping screws as replacements for standard hardware is generally not advisable.