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Tianjin Wang xia Spring Co., Ltd. was founded in 2005 and located in Jinghai County, Tianjin , China . It is very convenient for transportation east of Tianjin port. 

Our company is the professional manufacturers which combine a set of spring manufacturing, R & D with surface 

Address:No.2 street,chenguantun Town,Jinghai,Tianjin ,China Sales Department 
E-mail: General Manager Jack:xialianghai@cnwxspring.com  /  Cissy:cissycen@tjwangxiaspring.com  /  sun:sun@tjwangxiaspring.com  /  Bella:bella@tjwangxiaspring.com

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Extension spring

Extensionspringsaredesignedtoabsorbandstoreenergyaswellascreatearesistancetoapullingforce.Itisinitialtensionthatdetermineshowtightlytogetheranextensionspringiscoiled.Thisinitialtensioncanbemanipulatedtoachievetheloadrequirementsofyourparticularapplication.ExtensionSpringMeasurementsHoldthespringinonehand,andthecalipersintheotherhand.Placethecalipersacrosstheoutsidecoil,eitherattheendorthecenterofthespring.ThisiscalledtheOutsideDiameter(O.D.).Placethecalipersonthewireatoneendofthebodycoilofthespring.ThisiscalledtheWireorMaterialSize.Placethecalipers(ortapemeasure)onthefulllengthofthespring,insidethehooks.ThisiscalledtheLength(L.I.H.).(seediagramforexample)TolerancesTolerancesforextensionspringratesdependuponthebody-diametertowire-diameterbutareusually+/-10%and+/-5%onthediameter.Theinitialtensionismuchmoredifficulttocontrolandisofferedasareferencevalueonly.Ends
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PRODUCTS DETAILED

Extension springs are designed to absorb and store energy as well as create a resistance to a pulling force. It is initial tension that determines how tightly together an extension spring is coiled. This initial tension can be manipulated to achieve the load requirements of your particular application.

Extension Spring Measurements

  1. Hold the spring in one hand, and the calipers in the other hand.
  2. Place the calipers across the outside coil, either at the end or the center of the spring. This is called the Outside Diameter (O.D.).
  3. Place the calipers on the wire at one end of the body coil of the spring. This is called the Wire or Material Size.
  4. Place the calipers (or tape measure) on the full length of the spring, inside the hooks. This is called the Length (L.I.H.). (see diagram for example)

Tolerances

Tolerances for extension spring rates depend upon the body-diameter to wire-diameter but are usually +/- 10% and +/- 5% on the diameter. The initial tension is much more difficult to control and is offered as a reference value only.

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