China 90lbs Light Blue Color Extension Spring for Garage Door

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 rodFor 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 doorMatch measured door weight with same spring weight capacityDouble-looped ends for stronger connection to lift cables
NameNew Sectional Garage Door Extension Springs Replacement in Green ColorDiameter1 3/4" ,2" , 25/8" , 3 3/4" , 5 1 /4" , 6" and othersMaterial72B ,82B , 60Si2MnA,65Mn etc...CustomizableCan made by your drawings, sample and dimensionSurface TreatmentWhite zinc plating, Nickel plating, Chrome plated, Cataphoresis, Become black, Powder coating, Apply oil ,paint or as customers' requestApplicationgarage doors,factory lift doors,industrial door installation ,shutter doors in matching torsion and extension springCertificationISO9001MOQAny small trial order is welcomeDeliver time7-15 workdays based on MOQPackageStandard Packaging, Wooden Carton Or as per customers' requirementsPaymentterm30%T/T deposit,70% before shipping




FAQ:
How to make Torsion Spring as per your enquiries?
1,Pls provide me main specification as follows:
•Wirediameter
•Material
•Body length
•Maximum outside diameter, minimum inside diameter
•Number of coils
2, detailed drawing or real samples is very useful.
3, door dimension(door width&height,door weight and lifting systerm) is also Ok, we can custom designed.
Q: Are you a manufacturer ? Do you Accept OEM?
A: Yes, as a professional manufacturer, we have been in spring field for over 14years and we accept OEM! Just give us your design, we will make samples for you soon.
Q:What is your strengths?
A: •Competitive price
•High quality
•Good communication with customers
•Best after-sales service
Q:What is your packing?
A: •Standard packing,PE bags, plywood cases, wooden carton, pallet.
•based on your requirements.
Q: How long is your delivery time?
A: Within 3-5 days after order /confirm/ied. 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.