That's an excellent and very practical question! As a manufacturer, ensuring our urban benches remain sturdy and safe for years, despite constant use and exposure to the elements, is our top priority. We don't rely on standard screws or bolts that can vibrate loose. Instead, we use a multi-layered fastening approach designed specifically for the harsh reality of public spaces.
Our primary system involves tamper-resistant security fasteners. These are specially designed bolts that require unique driver bits to install or remove. This prevents casual vandalism or unauthorized disassembly. The slats are pre-drilled, and the bolts thread directly into welded, threaded inserts on the powder-coated steel frame. This metal-to-metal connection is far superior to screwing into a pre-drilled hole in the frame itself, which can strip over time.
To combat the natural expansion and contraction of wood due to temperature and moisture, we incorporate elongated mounting holes in the slats. This allows the wood to move slightly without stressing the fastener, which is a common cause of loosening. For our metal or composite slats, we use locking flange nuts or nylon-insert lock nuts underneath the frame. These nuts mechanically resist vibration, the number one enemy of any fastener.
Finally, the entire assembly is often treated with a thread-locking adhesive during installation. This liquid compound sets to form a secure bond, adding an extra layer of insurance against any movement. The result is a bench that feels solid underfoot, requires minimal maintenance, and is built to withstand the rigors of daily urban life without its slats ever coming loose.