Profile: Derwent Castings Ltd. specializes in supplying iron castings. Moulds of unlimited size can be produced using the air setting (boxless) sand systems. All our castings are fully shotblasted fettled and primer painted if required. We provide M/C tool, valves, gas and water, power generation, pulleys and flywheels, structural, architectural & general engineering castings, and one-off and low volume batch castings.