The weight of a scaffold steel plank can vary depending on its dimensions and thickness. However, as an approximate range, a typical scaffold steel plank can weigh anywhere from 12 to 20 pounds (5.4 to 9.1 kg) per linear foot. It's worth noting that this is only an estimate and the weight can vary significantly depending on the specific type of scaffold steel plank being used. If you have a particular brand or model in mind, it's best to check the manufacturer's specifications to get an accurate weight.
