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Tek screws, also known as self-drilling screws, are specially designed fasteners that eliminate the need for pre-drilling holes in the materials being joined. They feature a drill point at the tip, allowing the screw to penetrate and create its own hole as it is driven into the material. The term Tek is derived from the brand name of a popular series of self-drilling screws, but it has become a generic term within the industry.

2. Ease of Installation Wedge bolts are designed for quick installation. Their tapered shape allows for easy insertion into pre-drilled holes in the formwork. This not only speeds up the construction process but also reduces labor costs, as fewer tools and less time are needed for assembly.

4. Load Capacity The load-bearing capacity of an M20 foundation bolt can vary depending on the grade of steel used. Common grades include 4.6, 8.8, and higher grades, with 8.8 indicating a high-strength bolt capable of bearing significant tensile and shear loads.

3. Thermal Expansion Materials expand due to heat. When temperature variations occur, the differing rates of expansion between the anchor bolts and the material they are affixed to can create stress, leading to loosening. This is especially common in environments with extreme temperature fluctuations.