... 3) Production technology and wire diameterCold Coiled: Diameter: ≤ 8mmHeat Coiled: Diameter: > 8mm4) Special features of titanium springsLow density,High specific strength ... of titanium springsTrain springs, The high voltage switch spring, Elevator spring, Automotive suspension spring, tension spring,Compression spring,Torsion spring, Disc Spring, Vortex coil spring, Wave spring,Plate spring,etc ...