Your Expert Power Springs Manufacturer

  • Customization From Design to Delivery.
  • Mounting & Assembly Service.
  • Quick Prototypes Within 3 Days.
  • Competitive Price Based on Over 3000 Sets of Stock Toolings.
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Power Springs

Power springs also known as clock springs, are made of steel strips, formed by specialized spring-forming machines.

Power springs can store and release rotational energy in the form of torque via the center arbor or spring housing. The torque increases throughout the total winding process.

Power springs feature less room required with power torque, and the number of turns can be up to 50 cycles. This feature made it wildly used in cables, hoses, etc.

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Use YongSheng Power Springs To Delight Your Customer

YongSheng produces all kinds of stainless steel mechanical power springs(thickness: 0.06-0.6mm, width: 2-55mm), like conventional power springs, pre-stressed power springs, spiral torsion springs. Custom your power springs with our tailored service, and we will offer you high-quality springs products that help to promote the performance of your product.

power springs

Conventional Power Springs

Conventional power springs are prevalent in our life, they can generate rotation torsion in the limited room, and their excellent retracting feature makes them the best choice for wheel reels, they are wildly used in retracting charger cables, tape measures, toys, and so on.

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pre-stressed power springs

Pre-stressed Power Springs

Pre-stressed power springs generate almost 25%-55% bigger torque force than conventional spiral power springs in the same room. they have a more recoil process compared to conventional springs after forming. They are wildly used in retractable wheel reels, seat belts, dog leashes, etc.

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pre-sales guide

Free Pre-sales Service

YongSheng provide you the pre-sales service for free, it’s better to consult our expert before choosing one spring. With over 18 years of industry experience and thousands of cases around the world, we can provide you the best solution for retractable function based on your application.

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Why Yongsheng Power Springs

  • power-springs
  • power springs1
  • power-springs

There are 2 kinds of power springs in YongSheng, they are conventional power springs and pre-stressed power springs, and all are made of 301 stainless steel.

Pre-stressed power springs will entail the added recoil process than conventional power springs, which makes them have 25-30% bigger torque than conventional.


High-torque delivery per unit of deflection.
Normal residual stresses.
Pre-stressed power springs can store 25% ~ 55% greater energy than conventional.

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As a professional power springs supplier since 2002, Yongsheng can provide you the premium power springs at a competitive price.

  • All kinds of stainless steel power springs.

  • Full customization from drawing design to packaging with mounting & assembly service.

  • Mass springs in stock can greatly save your time and cost.

  • Complete testing including torque testing, hardness testing, fatigue testing, etc.

  • ISO9001 & ISO14001 certified facilities.

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How Do We manufacture the Power Springs?

YongSheng has produced mechanical power springs for over 20 years, we know every key point and know-how in the production field.

From the material preparation to the shipping, the quality control works throughout each step. Before shipping, the power spring will be direct insertion into the customer’s product or confined by a protective ring or nylon band. 

power-spring-bounded-with-nylon-band power-springs-bound-with-ring

ISO9001 and SGS-certified production line will produce premium springs for you.

You can know how your orders go along via the photos or real-time video, and you have the final say.

Manufacturing process:

Power Springs manufacture

Yongsheng Power Springs

Power springs can be wildly used in healthcare, automotive, industrial, toy and so on.

YongSheng earns good reputation via high quality and affordable price in power springs, strictly quality control with high production capacity make us to be the most competitive supplier.

We will always be your best partner in power springs.

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Stock Power Springs in YongSheng, Favorable Price For You

Select your type of power springs in below stock table, and you will get a favorable pricing

Conventional Power Spring
Product No.T(mm)W(mm)L(mm)Min. Torque
Max. Torque
TurnsArbor size

T: Thickness     W: Width      L: Length

Pre-stressed Power Spring
Product No.T(mm)W(mm)L(mm)Min. Torque
Max. Torque
TurnsArbor size

T: Thickness     W: Width      L: Length

If you want to customize your power springs in your application, it’s better to tell us these parameters like thickness, width, O.D(outer diameter), arbor size.

You can also just tell us your application and needs of torque force, our engineer will design it out and then continually adjust to meet your requirement.

Thickness and Tolerance Correlation Table

Download E-catalogue

Application of Power Springs


There are a lot of kinds of flat coiled springs be used in automotive parts, one of the most common parts is the seat belt.

Seat-belt must-have features like a long voyage, long lifecycle, easy to fetch, and automatic retraction, the pre-stressed power springs are the best one for it.

YongSheng has several types of power springs for seat-belt, inquiry our expert for more.

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Dog leash, hose reel, badge reel, and some toy(hairspring) also use the power springs to get the easy retraction.

It features a long length, long lifecycle, convenient retraction.

YongSheng has produced thousands of springs for over 5000 clients worldwide.

Welcome to contact our expert for more.

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Power springs also are applied wildly in medical devices & healthcare applications, such as auto-injectors, cable, and cord management. etc.

YongSheng, the leading flat coiled spring supplier in China with over 18 years of experience.

Inquiry our expert for your solution!

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Reduce Your Maintenance Cost With YongSheng Power Springs

YongSheng can custom any types of spiral power springs according to your requirement. Just give us your application or detailed size of the cavity or drum. We will help you cost down and rocket your business.

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  1. Power spring is a type of spiral spring, it can be made of stainless steel strip, carbon steel strip, or Inconel strip.
  2. Power spring features power rotational torque in the limited room when it works, which is usually used in cable reels, dog deash, medical devices, etc.
  3. Power springs are also known as clock springs, spiral springs, spiral torsion springs.
  4. Power springs are divided into conventional power springs and prestressed power springs.

Prestressed power springs belong to power springs, compared with conventional power springs, prestressed power springs have an added recoil process,
which can provide a 25-55% bigger output than conventional power springs.

prestressed power springs feature the “S” shape when it is in the unleashed state.

pre-stressed power spring

Normally, we will stock some of the types of power springs for our long-term cooperative partners in case of need, for the stock springs, the lead time is between 5-7 days, for customized springs, it usually needs to take around 12-21 days.

Power springs can generate the rotating force, but they belong to variable torsion force. if you tend to the constant rotating force, we recommend to apply the constant torque springs, it can generate very fluent rotating force and easy to handle it.

Usually, we refer the clock springs as spiral torsion springs, they are all generated rotating force, and have the similar appearance, the feature of clock springs is the torsion force almost linear within first 360 degrees, once surpass 360 degrees, the torque will increases rapidly, so we often apply it in some kinds of timers.

YongSheng can produce the maximum torque of power spring is 50N, and the minimum is 0.08N, so we normally named the high torque power spring when it generates torque more than 30N.

In YongSheng, we recommend clients to apply the SUS301 stainless steel strip.

There are some excellent features for it, like good antirust feature, high yield performance, easy to form, and outstanding mechanical property.

Sometimes, we also apply the carbon steel strip as the raw material, it is cheaper than SUS301, but it owns the shorter life-cycle, and be easy to rust, the mechanical also not as well as the SUS301.

When you want to design a power spring, some parameter is necessary before the job gets started.

just like the chart below, thickness, width, inner diameter, outer diameter are the key parameter in the power spring calculator, which decide the rotational torque in the application. besides, we can design and manufacture a power spring according to the four parameters.


Power spring can provide rotational torque force, prestressed power spring can generate 25%-55% bigger energy than conventional power spring, however, conventional power spring has a longer lifespan than prestressed power spring. If the rotational torque force is required, we can choose one based on our actual demand.