Constant Force Springs

Constant Force Springs, Constant Tension Springs / Tech Spring Manufacturing Corp. is a high quality Metal Spring Manufacturer in Taiwan, offering Wave Springs, Retaining Rings and Constant Force Spring with good quality and reasonable price.

Constant Force Springs - Constant Force Springs, Constant Tension Springs
  • Constant Force Springs - Constant Force Springs, Constant Tension Springs
  • Constant Force Spring, Constant Tension Springs
  • Constant Force Spring, Constant Tension Springs

Constant Force Springs

Constant Force Springs are generally constructed as a pre-stressed flat strip material that is tightly wrapped around a drum or shaft in the center and the hole in the free end is attached to a loading force like a counterbalance application. As the spool is unwound (deflected), it exerts a near constant force because the geometry of the coil remains nearly constant by the drum.

TSMC’s constant force springs offer a number of user benefits: include a constant load at a zero rate, a smooth range of motion, strong force yield within small spaces, extremely long linear extensions possible and store power indefinitely when extended... The constant force spring is an excellent design component for applications where a constant load is required.

Basically, the length, material thickness, width, the diameter of the coil and the natural radius curvature all contribute to extension resistance (affect the spring’s load). Additional flexibility in load can be increased by using multiple constant force springs with spool, tandem, laminar, back to back, cavity ,pulley mounting or in other configurations to suit the design situation. The full rated load of the spring is reached after being deflected to the length extended to 1.25 times its diameter.

Our constant force springs can be used in many applications include systems that require retraction like cable retractors, door closers, power cords, tape measures, window regulator mechanisms, hose retrievers, space vehicles, gym equipment, counterbalances, toys, electric motors, hair dryers, and other long-motion functions. Also our talent engineer can custom design and manufacture an end fitting for your application.


Roll back the force (zero gradient).
When stretched to a length of 1.25 times the outside diameter, a fixed force is achieved.
There is no friction between the coils (acting smoothly).

Engineering Design
Constant Force Spring

Custom products are a specialty of TSMC (Tech Spring Manufacturing Corp.), as a full service precision manufacturing company, our experienced engineers have extensive knowledge of custom parts, they are always available to assist you to conduct a comprehensive functional analysis of development and gives a feasible solution through our own formula from the preliminary design phase to fabrication that meets your application needs.

There are four critical factors when considering a Constant Force Spring design such as Bore/ shaft (ID/OD), Load, Working height at which the load is applied and Material desired, as well as the other input parameters that contain the wire thickness, wire radial wall, active number of turns, work height, load at work height ... The input data as shown on the left table. And calculation results with spring rate (stiffness), working load (±10%), outer diameter at solid height, Working curve and Life cycles prediction where found in the down table.

Whether you need a standard or custom Constant Force Springs, please send us your application requirement, our experts will hand-select or commend the best solution for your specific needs.

Constant Force Spring

Constant Force Spring

Related Products
Constant Torque Springs(A type) - Constant Torque Springs-A-type
Constant Torque Springs(A type)

TSMC 'S Constant Torque Springs are constructed from a pre-stressed flat strip material that...

Constant Torque Springs(B type) - Constant Torque Springs-B-type
Constant Torque Springs(B type)

TSMC 'S Constant Torque Springs are constructed from a pre-stressed flat strip material that...

Related Materials
Corrosion Resistant

Wire for use in corrosive environments such as gases and liquids. Materials which are resistant to chemical attack in acidic, alkaline or complex environments. If...

Electrical and Electronic

Wire used for High Performance electrical and electronic applications (often in high temperatures), selected for their specific electrical and associated...


Wire for withstanding high loads and / or stresses and those with good strength to weight ratios. In many cases, mechanical properties can be further increased...

Water Resistant

Wire which performs well in aqueous environments. Materials which are resistant to corrosion in subsea or other application areas; where exposure to moisture...

Heat Resistant

Wire for use in high temperatures where high strength, creep and stress rupture resistance, oxidation resistance or a combination of these is required. If...

Controlled / Low Expansion

Wire which has a low or controlled rate of thermal expansion at room temperature, often used in metal to glass sealing or electronic applications. If you have...

Electrical Resistance Wire

Wire used where linear electrical resistance can be achieved through selection of different sizes and shapes. Often used in heating elements or resistors. If...

Hot Cutting and Sealing

Wire used typically for packaging and cutting applications. Materials which have electrical resistance properties which allow them to efficiently reach...

Sub Zero

Wire which has good mechanical properties in low temperature environments, typically materials will be ductile in nature and have good fracture toughness. If...

Specific Applications

Wire that has properties that lend themselves extremely well to being tailored to very specific applications; examples might include medical devices or watch...

Constant Force Springs | Spring Manufacturer - Tech Spring / TSI / TSMC

Tech Spring Manufacturing Corp. is one of the prime Constant Force Springs | spring manufacturers based in Taiwan since 1987.

ISO accredited and manufacturing all types of springs, stamping molding and assembly of metal parts to Europe, USA, UK & Australia. We are specialized in the manufacturing, designing and analyzing all kinds of spring, such as wave springs (including of compression wave spring, wave single turn and nested spring), linear expander, retaining rings (including of internal, external, single turn and more turns), constant force spring, power springs (including of general and prestressed types), etc

Tech Spring / TSI / TSMC has been offering customers high-quality precision-made springs, both with advanced technology and 31 years of experience, Tech Spring / TSI / TSMC ensures to meet each customer's demands.