| Function: | Drive, Restoration, Measurement |
|---|---|
| Material: | High Carbon Steel |
| Usage: | Industrial, Auto, Furniture, Home Appliance, High Carbon Steel |
| Load Type: | Extension |
| Production Process: | Cold Roll |
| Shape: | Coil |
| Samples: |
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| Customization: |
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Audited Supplier 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.
| Name | Customized Garage Door Extension Spring |
| Wire Diameter | 2.5mm-12mm |
| Material | 72B |
| Customizable | Can made by your drawings, sample and dimension |
| Surface Treatment | White zinc plating, Color zinc plating, Nickel plating, Chrome plated, Cataphoresis, Become black, Powder coating, Apply oil ,paint or as customers' request |
| Application | Luxury 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 |
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: Whatis your warranty?
A: One year after sale service.
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Audited Supplier 
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