Profile: Renton Coil Spring Co. offers high performance springs, which are custom designed for auto racing, motorcycles, downhill mountain bikes and snowmobiles. We design and manufacture titanium springs for demanding aerospace applications. We manufacture titanium valve spring for pro stock, top fuel and alcohol drag race engines. We have capability to work with flat, sheet and strip material. We test compression springs, extension springs, torsion springs, double torsion springs and clock springs & assemblies.