Yes—in most cases, the bolts on these outdoor benches are at least tamper-resistant, and many are specifically designed to discourage theft. The exact hardware varies by model, but typical commercial benches use security fasteners such as one-way clutch-head screws, pin-in-Torx screws, shear bolts, or breakaway nuts. Shear bolts are especially common: once tightened, the head snaps off and leaves a smooth surface that standard sockets and pliers cannot grip.
That said, “tamper-proof” is not the same as impossible. A very determined thief with an angle grinder or battery-powered cutting tool can defeat almost any fastener. The real goal is to make theft slow, noisy, and inconvenient. For public parks, schools, and commercial spaces, the best protection combines tamper-resistant bolts with through-bolting into concrete pads, steel ground anchors, or buried mounting plates.
If you are buying or installing outdoor benches, look for models that list tamper-proof or anti-theft hardware. You can also upgrade security by filling bolt heads with epoxy, using rounded security nuts, or having the fasteners welded after installation.
So, are the bolts on these outdoor benches tamper-proof to discourage theft? Usually yes enough to stop casual theft and opportunistic removal. Just keep in mind that no outdoor furniture is completely theft-proof, and a solid anchored installation matters as much as the bolts themselves.