This is a great question, and very important in ensuring that your anchor hardware has enough substance to hold your product in place as well as counteract the tension and forces that are further applied to that anchor point. This ‘depth’ also varies when we compare wooden post applications to steel post applications.
With a wooden post or truss, we would need at least 3” of substance to screw one of our Welded Screw Eyes into and ensure that the thread of this hardware is screwed in fully. If you have access to the back of the post or truss or pergola that you are looking at anchoring to, you can use one of our Through Bolts with a Welded Eye. This piece of hardware allows support from the back using a lock washer, lock nut and acorn nut.
With steel posts, wall thickness is one of the most important factors when determining the strength of the structure/post. We recommend a wall thickness greater than or equal to 0.25” in order to avoid any future deflection as a result of the tension in our products. Through Bolts with Welded Eyes are our most commonly used hardware in steel applications.