High strength extension coil spring

Specifications

1. fully automatic production
2. Professional service team
3.more than 13 years experiences
4.flexible in custome-design

High strength extension coil spring 

 

 

Features of extension spring

 

 

Each coil of extension spring close together and there are pull-tabs at both ends for puling easily. Extension spring possess initial tension which is used to keep the spring coil of pull-tabs closed.

 

Initial tension only changes in a limited range so as to realize expected load characteristics. Other characteristics, such as diameter, aperture of pull-tab can be customized to ensure that it will meet the customer’s accurately.

 

Detailed Information About the Spring
Material	Stainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, brass, bronze, etc
Load type	extension
Finish	Zinc-plated, nickel-plated, chrome-plated, silver-plated, gold-plated, imitation gold-plated, and  as customers request
Advantage	High quality, competitive prices, first-class fully automatic production equipment , safe package and prompt delivery .
Application	industrial equipment,electronic devices,etc
Payment terms	T/T, L/C,WU
Lead-time	15 days
Packaging	Inner plastic bag, outer carton box, and advised by customer.
Certification	ISO9001:2008 ,ISO14001and ROHs
Equipments	Advanced CNC computer spring machines with high precision and efficiency
Technology	Experienced engineers ,technicians and Skilled Workers;
Inside diameter	As your request
Outside diameter	1 mm and above.
Free length	The overall length of a spring in the unloaded position.
Total coils	The total number of coils including the active coils,the top and bottom ends
Active Coils	The coils which are free to deflect under a force.
Wire diameter	0.01~ 10mm
Load	Our computer program can assist you on the load design.

 

 

Products Display

 

 

Knowledge of extension spring

 

Please fill this form and send it to us if you need custom torsion springs

 

We can produce all sizes and types of spring according to your samples, design drawings or design thinking.

 

Why choose us:

1. Professional research and development team.

2. Complete first-class fully automatic production and testing equipment, careful safe package and prompt delivery.

3. Skilled and well-trained work team.

4. Provided competitive price and serious quality control.

5. Passed ISO9001:2008, ISO14001 and ROHs certification.

6. Over 10 years professional manufacture experience.

 

 

How to place an order:

1.What you need to do is send us your design drawing, samples or design concept draft, after that we will assess your products and budget unit price for you.(see bottom charts )

2. We’ll communicate with you again about if there is a need for sample making after your approval.

3. Production time of samples: 3 days for simple samples and 7 to 10 days for complicated samples which need mold open.

4. For customers of first cooperation, we can make a proof for free to show our capacity and high efficiency service to you. As for particularly complicated samples, we will communicate with you separately.

5. Mass production delivery: usually delivery time is 10-15 days, but we can try 7-10 days if it is a rush order. It depends on production plan if it’s a sizable order.

6. Packaging: as to complicated products, we can special design based on your packing requirement.

a) If you are worrying about freight trouble because of your small quantity goods, it will be the best choice to use express. We will offer you the cheaper express price than the official UPS or DHL; for example, 100kg goods only need 6usd/kg and 50kg goods only 7usd/kg. If you just place an order for 1000pcs, you only need to pay very little express charges and gain the fastest delivery.

b) If you place a large order, we will help you ship goods by sea, and we are very experienced to handle with it, we can organize all kinds of goods a whole container and recommend best vessels agent for you.

 

 

 

About us:

Dongguan City Yisen Precision Spring Co., Ltd. (Since 1998) is a high technology hardware company with more than 200 workers, and has been specializing in designing and manufacturing springs, hardware and spring making machines. We've gained worldwide customers' trust with our high design level, top class quality, high grade services and competitive prices, which make us become the supplier for many famous companies in many business lines in the world. Our company has been certified by GB/T19002-1994, ISO14001 and ISO9001:2008 management system in order to upgrade the whole quality management and provide you with the best quality products and the most valuable services!