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Spring Steel Helical Double Hook Tension Springs 20mm Diameter

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Dongguan Hezhi Hardware Co., Ltd.

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Spring Steel Helical Double Hook Tension Springs 20mm Diameter

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Brand Name :	HEZHI
Model Number :	N/A
Certification :	Rohs&Reach
Price :	$0.05- $0.8USD/ Piece/Pieces
Payment Terms :	T/T, L/C
Supply Ability :	10,000,000 Piece/Pieces per Month According to the order
Delivery Time :	7-15 work days

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Company Profile

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

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)		SWP-A SWP-B	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

Production Detail

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Reference Drawing

Company Profile

DONGGUAN HEZHI HARDWARE CO.,LTD

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!"

HeZhi in Vietnam

Our Service

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

FAQ

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.

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Dongguan Hezhi Hardware Co., Ltd.

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Extension Springs

Description of Double Hook Extension Springs

Specification of Double Hook Extension Springs

Reference Drawing

DONGGUAN HEZHI HARDWARE CO.,LTD

HeZhi in Vietnam

Pre-Sales Service

After-Sales Service

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.

Steel Double Hook Tension Springs

20mm Double Hook Tension Springs

Helical Double Tension Spring

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Dongguan Hezhi Hardware Co., Ltd.

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

Spring Steel Helical Double Hook Extension Springs

Description of Double Hook Extension Springs

Specification of Double Hook Extension Springs

Reference Drawing

DONGGUAN HEZHI HARDWARE CO.,LTD

HeZhi in Vietnam

Pre-Sales Service

After-Sales Service

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.

Steel Double Hook Tension Springs

20mm Double Hook Tension Springs

Helical Double Tension Spring

Spring Steel Helical Double Hook Tension Springs 20mm Diameter

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.