The length of the spring is not a problem serpentine spring, the problem is you have to calculate what kind of spring, you need to know to be stubborn spring coefficient, intensity according to your needs snake shapes spring factory direct, you need stiffness coefficient is stubborn 1N / mm spring, depending on the design, spring diameter, number of turns, diameter may be different, the placement may not be suitable for your needs. to the way you calculated in accordance with their own needs to choose the spring. spring constant k and the diameter of the spring, the spring wire diameter, spring material production serpentine spring, the effective number of turns of the spring about the specific relationship is: inversely proportional to the diameter of the spring ring, the diameter of the spring is proportional to the fourth power, Unlike the elastic modulus of the material is proportional to the spring, and spring is inversely proportional to the number of turns of effective c = F / λ = Gd4 / 8D23 = Gd / on 8C3n formula: c: spring stiffness, (ie you said resiliency coefficient, high school physics called stubborn coefficient k); F: spring suffered load; λ: the amount of deformation of the spring when under load generated by F; G: shear modulus spring material; (steel for 8 × 104MPa, bronze for 4 × 104MPa) d: spring wire diameter; D2: spring diameter; n: number of active coils springs; C: spring index (also known as spring index) can be seen from the above equation when other conditions are the same, C value more. small spring, the greater rigidity, that spring more hard; otherwise the more flexible it should be noted, C value is smaller, inner spring, the more stress the difference between the outside and the poor, the more difficult the snake coiled shape of the first spring. also lower the material utilization, and at work will cause greater torsional stress. Therefore, when designing the spring, the general provisions C≥4, and when the spring wire diameter d is smaller, C value is more appropriate to take a large value. Dongguan ? City Top good Spring Manufacturing Co. - Production Process Description spring spring spring production process production process coil spring (stress relief annealing) tempered spring grinding chamfers shot one-serpentine spring factory outlets | Top good spring (Certified ) | Beijing serpentine springs from top to provide good Dongguan City Hardware Products Co., Dongguan Top good Hardware Products Co. (dinghaospring.com) is Dongguan, Guangdong, spring leader, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Good leadership at the top of the spring with the staff warmly welcome all inquiries negotiations to create top good spring a better future.