Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Basic Information
Place of Origin: China
Brand Name: HEZHI
Certification: Rohs&Reach
Model Number: N/A
Minimum Order Quantity: 1000pcs
Price: $0.05- $0.8USD/ Piece/Pieces
Packaging Details: PE Bag with Carton Box
Delivery Time: 7-15 work days
Payment Terms: T/T, L/C
Supply Ability: 10,000,000 Piece/Pieces per Month According to the order
Detail Information
Product Name: Spring Steel Helical Double Hook Extension Springs Application: Hardware/ Automobile
Size: Customized Usage: Automobile;Auto;Car
Wire Diameter: 0.05mm - 20mm Material: Stainless Steel, Iron, Carbon Steel ,Piano Wire Or As Required
Finish: Zinc, Nickel, Chrome, Gold, Silver Plating Etc. Color: White, Black, Silver, Gold Or As Required
Scope Of Business: Springs, Stamping Parts Load Type: Extension
High Light:

Steel Double Hook Tension Springs


20mm Double Hook Tension Springs


Helical Double Tension Spring

Product Description

Spring Steel Helical Double Hook Extension Springs

Description of Double Hook Extension Springs


A tension spring works the opposite of a compression spring. A compression spring acts in reverse when pressed, and a stretch spring acts in reverse when stretched or pulled.most tension springs usually operate with some degree of tension, even without any load. This initial tension determines how tightly the stretch spring is wound without any load.


Specification of Double Hook Extension Springs

Material Stainless Steel (SUS304,301.316,310,201,631, ect)
Paino/Music Steel
Carbon Steel 
Iron or Customer's Demand
Finished Electroplating Zinc ,Nickel ,copper ,black etc.
Heating In different tempurture
Cleanning Passivation,Clean,Rust-Proof
Process CNC Machine, digital control multi-functional computer spring coiling machine, mechanical automatic spring coiling machine, spring grinding machine, heat treatment equipment
Application used in computer, electronics, home appliances, cameras, instruments, doors, motorcycles, harvesters, automobiles, and other industries to control the movement of machine parts, ease impact or vibration, storage energy, measure the size of force
Wire diameter Range 0.05-20.0mm
Design According to customer's drawing or sample
Packaging PE Bag+carton Box, inner plastic bags and outer carton
























Material of Double Hook Extension Springs


Material Type Model number Characteristic Application
Stainless Steel (SUS) With or without magnetism shine or nitrided surface, dark surface 201, 202 etc. Less nickel plated, could not proceed salt spray test General using craft and toys
301, 302,  304, 310, 316, 321 High temperature resistance Electronic part, home appliance, Locks, toys or can be used in all kinds of products.
410, 420, 430 etc. High strength OEM aments and tableware products
630, 631 etc. High heat stability Electrical application or product use under high temperature
Carbon Steel (SWC) Low carbon steel, high carbon steel, nickel plated steel, Galvanized wire 55CrSi 60SizCRVA

Good elasticity

high hardness

Electronic part, home appliance, Locks, toys 
Piano Steel (SWP)  



High tensile resistance, and long worklife Application for all kinds of small products
Copper Wire Phosph or copper wire( C519R), Nickel plated copper, Bronze   Good conductivity of electrical Electronics, electrical applicance, like antenna
Iron Galvanize iron wire Customized or normal material Soft material Craft spring, decoration wire


Spring Steel Helical Double Hook Tension Springs 20mm Diameter 0

Production Detail


Spring Steel Helical Double Hook Tension Springs 20mm Diameter 1

Reference Drawing


Spring Steel Helical Double Hook Tension Springs 20mm Diameter 2


Company Profile


Dongguan Hezhi Hardware Co., Ltd. is located in Dongkeng Town, Dongguan City, Guangdong Province, China. We are a worldwide import and export trading company.We belong to a group of companies established in the early 20th century.Our company is a spring factory specializing in R&D design, amnufacturer and sales, introduced equipment technology and hired senior engineers with more ten years of experience to highly cooperate with various customized ODM and OEM products.

Our company is a hardware factory specializing in R&D design, manufacture and sales of precision components. The company introduces advanced equipment and production technology from Taiwan and abroad, adopts CNC high-precision computer machine, compression spring machine and other mechanical equipment, and employs senior engineers with more than ten years of work experience to debug mechanical equipment and customize production.


“The testimony is pragmatic and the attitude of the people. Quality service is the pursuit of the people!"

Spring Steel Helical Double Hook Tension Springs 20mm Diameter 3

Spring Steel Helical Double Hook Tension Springs 20mm Diameter 4

HeZhi in Vietnam

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Our Service
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Pre-Sales Service

* Inquiry and consulting support.
* Sample testing support.
* View our Factory.

After-Sales Service

* Training how to instal the machine, training how to use the machine.
* Engineers available to service machinery overseas.

Packing & Delivery
Spring Steel Helical Double Hook Tension Springs 20mm Diameter 8

1. What is a extension spring?
Extension springs absorb and store energy as well as create a resistance to a pulling force. These springs are normally attached at both ends to other components and when these components move apart, the spring tries to bring them back together again.


2. Which is better torsion or extension springs?
Torsion springs tend to be stronger and more durable than extension springs. And though they are more expensive, they last longer, between 15,000 and 20,000 cycles as opposed to 10,000 cycles with extension springs. They also offer greater balance and show more control when moving, not jerking as the door moves.


3. How long do extension springs last?
3. Extension Springs' Life Expectancy: Extension springs are installed at the side of the door and act extend, rather than contract (as does the torsion spring). They have 15,000 and 20,000 cycles which equate 7 – 12 years of life expectancy.


4. Are extension springs safe?
Extension Springs: Extension springs can become very dangerous if and when they break. Unlike a torsion spring, extension springs are stretched along the side of the garage door tracks and can become projectiles causing damage or injury. Extension springs should always receive the installation of a “safety cable”.


5. How can I make my extension spring stronger?
If the spring is too weak, you do the opposite; decrease the outer diameter, increase the wire diameter, or reduce the amount of coils by making the body length shorter and increasing the length of the hooks.

Contact Details

Phone Number : 18379949013

WhatsApp : +8618379949013