4. Corrosion Resistance Many hex head self-drilling screws are coated with various finishes to enhance their corrosion resistance. This is crucial for outdoor applications where exposure to the elements can lead to rust and degradation over time. Options such as galvanized or stainless steel coatings can provide extended lifespan and reliability in harsh environments.

There are various types of expandable anchors, including wedge anchors, sleeve anchors, and drop-in anchors. Each type serves specific purposes and offers distinct advantages depending on the application and substrate being used. For instance, wedge anchors are ideal for heavy-duty applications, while sleeve anchors are more versatile, accommodating both solid and hollow materials.

The M in M20 signifies that it is a metric bolt, aligning with the International System of Units (SI). The number 20 denotes that the nominal diameter of the bolt is 20 millimeters. Foundation bolts are typically made from high-strength materials, such as structural steel, to ensure they can withstand substantial loads and resist environmental factors.

- Pre-filled Systems These anchors come pre-loaded with resin and are designed for specific applications, simplifying the installation process.