Which component strengthens the hold of a sleeve anchor once installed?

The correct answer is that an expanding sleeve strengthens the hold of a sleeve anchor once installed. When a sleeve anchor is inserted into a pre-drilled hole in a substrate, such as masonry or concrete, the expansion mechanism of the sleeve anchor engages with the walls of the hole as the anchor is tightened. As the bolt turns, the cone at the tip of the anchor moves upward, causing the sleeve to expand outward against the sides of the hole. This creates a strong friction fit that securely holds the anchor in place, significantly increasing its load-bearing capacity.

This expansion is crucial, especially in applications where the anchor will bear weight or resist pulling forces. The other components such as a lock washer, a nylon insert, or a flat washer function differently; they can help prevent loosening or distribute the load but do not provide the specific mechanism that enhances grip within the substrate like the expanding sleeve does.