China wholesale 8 Foot Garage Door Extension Springs Factories - Double Hook Wire Coil extension Tension Springs – DVT Spring

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China wholesale 8 Foot Garage Door Extension Springs Factories - Double Hook Wire Coil extension Tension Springs – DVT Spring Detail:

Basic Information

Mechanical extension springs are designed specifically for a height and weight of a product. The initial tension is the force that holds the coil together and must be exceeded to get the extension spring working. Although the standard initial tension is appropriate for most extension spring needs, initial tension can be customized for specific situations.

Extension springs are commonly used in automotive mechanisms, garage doors, trampolines, washing machines, tools, toys, and equipment in a wide array of industries. Extension spring ends are designed to meet specific application needs. Configurations include hooks, threaded inserts, extended twist loops, crossover center loops, expanded eyes, reduced eyes, rectangular ends and teardrop-shaped ends. Another extension spring configuration features a drawbar spring. In this design, the load at the ends of long, steel loops that pass through the spring center and compress the spring upon loading.

1Double Hook Wire Coil extension Tension Springs
Double-Hook-Wire-Coil-extension-Tension-Springs2

Extension Spring Parameters

Outer diameter- of the spring
Wire diameter – of the wire used to create the spring
Overall length – of the spring in the unloaded position
Rate – amount of weight required to deflect the spring one inch
Load -amount of weight the spring can carry when deflected to a given height

Extension spring parameters

Specifications

Item	Double Hook Wire Coil extension Tension Springs
Material	SS302(AISI302)/ SS304(AISI304)/ SS316(AISI316)/SS301(AISI301)
	SS631/65Mn(AISI1066)/60Si2Mn(HD2600)/55CrSiA(HD1550)/
	Music wire/C17200/C64200, Etc
Wire diameter	0.1~20 mm
I.D	>=0.1 mm
O.D	>=0.5 mm
Free length	>=0.5 mm
Total Coils	>=3
Active coils	>=1
End hooks	U shape, round shape etc.
Finish	Zinc plating, Nickel plating, Anodic oxidation,Black oxided,Electrophoresis
	Power coating, Gold plating, Silver plating, Tin plating, Paint,Chorme, Phosphate
	Dacromet,Oil coating, Copper plating, Sand blasting, Passivation, Polishing,Etc
Sample	3-7 work days
Delivery	7-15days
Appliction	Auto,Micro,Hardware,Furniture,Bicycle,Industrial,ect.
Size	Customized
Warranty period	Three years
Payment Terms	T/T,D/A,D/P,L/C,MoneyGram,Paypal payments.
Package	1.PE bag inside, carton outside/Pallet.
	2.Other packages: Wooden box, individual packaging, tray packaging,tape & reel packaging etc.
	3.Per our customer’s need.

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