1 4 self drilling screws

The process of installing concrete anchor bolts is quite straightforward. First, the location for the bolts is marked on the concrete surface. This is typically done using a drill bit that matches the diameter of the anchor bolt. Once the holes are drilled, the bolts are inserted into the holes and tightened to a specific torque to ensure a secure fit. The bolts are then covered with grout, which hardens over time to create an even stronger bond between the bolt and the concrete.

...

The terms 3% and 4% often relate to the percentage of the anchor bolt’s yield strength in relation to the concrete’s compressive strength. For example, a 3% concrete anchor bolt means that the bolt can withstand loads up to 3% of the concrete's yield strength, while a 4% bolt can handle loads up to 4%. This distinction is vital for engineers and contractors, as it influences load calculations, safety factors, and the overall design of the structure.


...