I’ve been looking into folding outdoor benches too, and here’s the honest answer: the hinges are surprisingly robust for most typical use, but they’re not all built the same.
First, let’s talk materials. Most decent folding benches use steel or stainless-steel hinges, often with a powder-coated finish to resist rust. Cheap ones might use thinner zinc or aluminum, which definitely bend or snap if you regularly sit or lean on the edge of the folded section. But in the mid-range and up, the hinge pin is usually thick enough (around 6–8 mm) to handle repeated folding and the weight of two people without issue.
The real test isn’t normal sitting—it’s what happens when you leave the bench unfolded on uneven ground or let kids bounce on it. That puts side-to-side stress on the hinge, which is its weak point. A well-designed bench will have a locking mechanism or a wider hinge plate to distribute that force, so it won’t just snap.
In my experience, if you’re buying from a reputable brand or checking the weight capacity (look for 500+ lbs rating), the hinges are heavy-duty enough for years of use. The ones that break easily are almost always the ultra-cheap models with thin, basic barrel hinges. So, no, they won’t break easily if you choose wisely and treat them as intended—fold carefully, don’t overload, and store them when not in use.