Helical spring, the spiral spring products made from around the spring wire, usually can be divided into extension spiral spring, helical compression spring and a torsion coil spring three categories. Spiral spring for which present in the different use of the environment in the specification is not the same, in the following chapters content specifications for the size on the spiral spring we introduce.
 
  ①The wire diameter. The wire size (wire thickness) is a key factor in the main characteristics of helical spring.
  ②The outer diameter. Intermediate spiral spring with a circle of two external distance measure, more convenient, but also easy to identify.
  ③The number of turns. Circle the number contains the total number of coils, effective coil number and the closed end coil number, the spiral spring can bear external counterforce, much depends in part on a ring number.
  ④The pitch. Pitch or pitch / lead, namely the spiral spring of a circle of thread to the tail ends in the axis of the change in distance.
  ⑤The free length. The free length of tensile, compression spring ends without any external force is applied in the case of length values.
  ⑥Length effect. Effect of length is the spiral spring is compressed or stretched to a fixed length of time, the spring itself with the reaction force value, the mix of goods play a specific utility.
  ⑦Free angle. The two leg is free angle of torsion spring in the absence of external force is applied when the rotation angle value.
  ⑧Function point. Effect of perspective that is torsion spring ends is applied in different directions reverse to a fixed angle, itself has the reaction load value and the torque value, the mix of goods play a specific utility.
  ⑨The spring constant. The tensile and compression coil spring in the external force when the axial deformation, the reacting force generated in each unit length; a torsion spring radial bearing the external force when rotating, the reaction force generated by each unit in the angle.
  ⑩Unit of length. In the domestic spring general with mm (mm) as the unit, and the habit of Europe and the United States in inches (inch).
 
  The spiral spring is widespread and common spring products for most industrial applications, due to the use of functions and various environmental factors, which requires the dimensions spring differences, at present the demand side in the development of a spring products, all need to manufacturers into the custom, in order to meet the development needs of their own. Custom spring for spring manufacturer, means more investment in human and material resources, such as debugging technology and performance requirements of the spring machine. The content source to Kaichuang spring machine: http://www.kcmcnc.com/en/.