Constant force spring is made by winding the steel strip into a coil which exerts a nearly constant retraining force to resist uncoiling. By comparing the differences between constant force spring and traditional wire springs, the advantages will be obtain as following: To exert nearly constant force during entire extension. Short initial deflection, it means that reaching the rated load at short extension. Long extension capability. The product range from 0.03~0.75mm in thickness and 1~50mm in width.

Ming Tai applied power spring in precision pen medicine injector, which has great performance and acquires high affirmation from the suppliers of drug delivery systems. The new type of precision pen medicine injector uses a distinctive power spring to deliver small but highly accurate doses of medicament.