COMMERCIAL-GRADE HARDWARE We use 5/16 ” diameter and 3/8” diameter electro-galvanized hardware on our play sets for maximum strength and stability. Our iron swing hangers are bolted completely through our swing beams with carriage bolts and lock nuts. Electro-galvanized wood screws are also used for non-structural components, instead of nails that can rust and/or work their way loose over time. Our swing chains are tested to withstand up to 800 pounds, and most of the hardware components that you will receive are the same as industrial grade units.