CC20040: Extension SpringExtension spring designed to provide tension and return force in various mechanical applications. Features an 8. 50 mm wire diameter and 48 mm outer diameter, ideal for maintaining tension in heavy duty machinery. Comes with a free length of 314. 50 mm and a spring rate of 26. 50 mm, ensuring reliable performance in demanding environments. Made from high quality steel for durability and long lasting use. Painted finish enhances resistance to corrosion