Home > Our Products > COMPRESSION SPRING     1) Overview Compression spring is the most commonly used spring. It is easy to design, relatively simple and cheap to manufacture, and has higher efficiency.  It has various shapes such as cylindrical, hourglass, barrel etc depending on the application.     2) Application Components for automobile, electrical, electronic, stationery, toy, industry, and information- communication     3) Features Compression coil spring is typically cylindrical and manufactured by hot or cold coiling, and the material for compressing the load applied to the spring. Spring ends have different shape according to the types of load and the coil diameter depends on the size.   4) Symbols and formula used for compression spring design 1) Spring symbols   d wire diameter a1 arm length (mm) Da mean coil diameter a2 arm length (mm) Na  number of active coils E   Nt  total number of coils G   K  spring constant (kg / mm) C spring index (Da/d) P  Load (kg) G SWP  8,200 d  deflection (operation angle) (mm) SUS  7,500 Pi  initial tension phosphor bronze 450 Kt  arm spring constant (kg.mm/degree) E SWP  21,000 M  moment (kg.mm) SUS  19,000 q  torsion angle phosphor bronze  11,000 K1  stress correction coefficient  ρ   SWP  7.85 Ke  arm spring stress correction coefficient SUS  7.9  torsion stress(kg/㎟) brass  8.6 σ bending stress (kg/㎟) German silver  9.0 tensile strength(kg/㎟) phosphor bronze  8.1 ℓ   length of spring with force applied (mm) inconel  8.25   2) Spring formula a) Weight :   b) Spring constant:   - Compression Spring - Extension Spring - Torsion Spring   3) Spring formula - Compression Spring  P= K x d - Torsion Spring    P= Kt x θ  *2   M ÷ arm lever length =P - Extension Spring    P= K x δ + P