Extension Springs are designed to absorb and store energy creating a resistance to a pulling force. All coils are active in an extension spring, and it is initial tension that hold the coils tightly together.
Extension Spring ends include threaded inserts, extended twist or cross loops, hooks or eyes at varying distances from the spring body. Round wire is most often used in the fabrication of extension springs because it is most adaptable to standard coiler tooling.

﹥ SPRING SHAPE : hook type at either end.

﹥ WORKING EXTENT : Able wire diameter rang, 使TM0.3mm ~ 使TM12mm.

﹥ USE : Car, Industrial machine, Brake, Absorber, Steering, Door Hinge, Transmission, Agricultural Machine, Heavy Equipment.



Specifications
Examples
 Meterial(mm) PW-2
 Wire diameter (mm) 白2.6
 Mean dia (mm) 白18.4
 Out-dia (mm) 白21 ▽ 0.3
 Total No. of coils(turns) 12
 Turning direction Right
 Free length (mm) 65 ▽ 1.6
 Initial tension (kgf){N} around 4(39)
Features of spring
 Specified length (mm) 87
 Specified load (kgf){N} 17.3(169.7)
 Spring Constant (kgf/mm) {N/mm} 0.61(5.98)
 Internal stress in designated length(≦)  
 (kgf/mm2) {N/mm2}
57(559)
 Test weight (kgf) {N} 22.5(220.7)
 Test weight internal stress (kgf/mm2) {N/mm2} 72.6(712)
 Shape U hook
 Anti-corrosion test Application of anti-corrosion oil
≦ : 1N/mm2 = 1MPa 

 
 
  
 
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