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Hefei Wang Qin Spring Co.,Ltd.

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Add: No.1288,Ziyun Road,Jingkai District,Hefei City,Anhui Province, China.

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Garage Door Extension Springs in Colorful Hooks
Time:20-08-07   Click:0

Introduction to Sectional Garage Door Extension Springs

Sectional garage doors are hinged, and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs, this normally is 15 percent. For example, a 100-pound pull spring requires 15 pounds of weight to separate the coils; when a door is open, the two springs will support 15 pounds of door weight without any stretch.

Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.

Garage door extension springs counterbalance the weight of garage doors to make them easy to open and close. One end is secured to a stationary angle or bracket, and the weight of the door pulls the other end.

  • Engineered For Maximum Application Range.
  • Minimum 10,000 Cycles, At +/- 7.5lbs Of Target Door Weight.
  • Plug-end extension spring with safety containment rod
  • For use with single-panel garage doors, toy hauler doors, etc.
  • Black Coated, Oil Tempered Wire Provides A Clean Durable Finish.
  • Clear, Easy To Read Spring Markings For Easy Identification.
  • Weigh door by disconnecting springs and placing scale under door
  • Match measured door weight with same spring weight capacity
  • Double-looped ends for stronger connection to lift cables
Name Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Diameter 1 3/4" ,2" , 25/8" , 3 3/4" , 5 1 /4" , 6" and others
Material 72B ,82B , 60Si2MnA,65Mn etc...
Customizable Can made by your drawings, sample and dimension
Surface Treatment White zinc plating,  Nickel plating, Chrome plated, Cataphoresis, Become black, Powder coating, Apply oil ,paint or as customers' request
Application garage doors,factory lift doors,industrial door installation ,shutter doors in matching torsion and extension spring
Certification ISO9001
MOQ Any small trial order is welcome
Deliver time 7-15 workdays based on MOQ
Package Standard Packaging, Wooden Carton Or as per customers' requirements
Payment term 30%T/T deposit,70% before shipping

Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks


Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks



Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks
Factory Direct Low Price Garage Door Extension Springs in Colorful Hooks

How to make Torsion Spring as per your enquiries?
Pls provide me main specification as follows
•Wire diameter 
•Material
•Body length
•Maximum outside diameter, minimum inside diameter
•Number of coils
 Or detailed drawing or real samples is very useful

FAQ:
Q: Are you a manufacturer ? Do you Accept OEM?
A: Yes, as a professional manufacturer, we have been in spring field for over 11 years and we accept OEM! Just give us your design, we will make samples for you soon.

Q: Can you do design for me?
A: Yes. We have a professional team having rich experience in spring design and manufacturing.Just tell us your door dimension(door width&height, door weight and lifting systerm), we can custom designed spring size and spring weight.

Q:What is your strengths?
A: Competitive price
   High quality
   Good communication with customers
   Best after-sales service

Q:What is your packing?
A: a, Standard packing,PE bags, plywood cases, wooden carton, pallet.
   b, Based on your requirements.

Q: How long is your delivery time?
A: Within 3-5 days after order confirmed. Of course, it depends on the actual quantity.

Q: What payment method do you accept?
A: we accept T/T, western union or paypal before production. Other payments are negotiable

Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment.


Q: What is your sea shiping port?
A: SHANGHAI port usually; any problems contact us ASAP.

Q: What is your warranty?
A: One year after sale service