5 tek screw

Flat head self-drilling screws are used in a variety of applications due to their versatility and efficiency. They are commonly used in construction, HVAC, and automotive industries, as well as in DIY projects around the home. For example, flat head self-drilling screws can be used to attach metal sheets to walls, secure HVAC components to roofs, and assemble furniture and cabinets. They are also a popular choice for installing shelving, picture frames, and other decorative items.

...

A hex washer head bolt is essentially a threaded rod with a hexagonal head, providing a larger surface area than a standard hex bolt. The integrated washer portion of the bolt serves two primary functions. Firstly, it distributes the clamping force over a wider area, preventing damage to the material being fastened and reducing the risk of loosening due to uneven pressure. Secondly, it increases the friction between the bolt and the surface, enhancing the holding power and ensuring a secure connection.

...