Which fastener is the best choice for attaching a pipe support bracket to a concrete wall?

The best choice for attaching a pipe support bracket to a concrete wall is an expansion bolt. Expansion bolts are specifically designed for use in solid substrates like concrete. When installed, the bolt expands against the sides of the hole, creating a secure anchor that can withstand significant loads and stresses. This makes them highly suitable for structural applications such as securing pipe support brackets where stability is crucial.

In contrast, other fasteners have limitations when used with concrete. Toggle bolts are effective for hollow walls but may not provide the necessary anchoring strength in solid concrete. Carriage bolts, while useful for fastening materials together, typically rely on a nut and are not designed for direct attachment to concrete. Lag bolts are more suited for use in wood or other softer materials and may not achieve the hold needed in a concrete setting. Thus, the expansion bolt stands out as the most reliable option for this specific application.