The Constant-Torque® Heavy Duty (HKF) is a breakthrough in clamping technology. A Belleville spring mechanism permits the constant torque clamp to automatically increase or decrease its own diameter due to changes in operational or environmental temperatures. The unique design eliminates “cold flow” leaks. With its 16mm band width and the 10 Belleville washer springs this clamps is the perfect solution for heavy duty applications exposed to temperature changes