Product name:
Precision tension spring (tension spring)

Product description:
Tension spring, also known as stretch spring or tension spring, is a key elastic element that stores energy when axial tension is applied at both ends and restores its original length when the external force is released. The core of its design is to provide precise and reliable tension, and it is widely used in various mechanical devices and equipment that need to reset, tension, buffer or provide constant tension.

Core features and advantages:

1. Excellent elastic performance: Made of high-quality high-carbon steel, stainless steel (such as 304, 316) or special alloys, it is precisely wound and strictly heat treated to give the spring excellent elastic limit and fatigue resistance, ensuring stable tension output and long service life in repeated tension cycles.

2. Accurate tension output: The initial tension, spring stiffness (elastic coefficient) and working stroke can be precisely designed according to customer needs to meet the specific requirements of tension in different application scenarios, and achieve precise control and reliable action.
3. Diverse end structures: Provide a variety of standard or customized end forms (such as round hooks, half-round hooks, British hooks, German hooks, threaded plugs, expansion rings, etc.) to ensure a firm and convenient connection with your assembly parts and adapt to various installation requirements.
4. Reliability and durability: Rich surface treatment options (such as galvanizing, chrome plating, phosphating, passivation, spraying, etc.), effectively improve the corrosion resistance, wear resistance and appearance of the spring, and adapt to different environments (including humid, general industrial environments and even some chemical environments).
5. Wide range of applications: Applicable to many industries and fields, such as:
Automotive industry: throttle/brake pedal reset, door handle reset, seat belt retractor, various cable tensioning mechanisms.
Home appliances: washing machine door seals, vacuum cleaner brush heads, oven doors, various switch button resets.
Medical devices: surgical instrument reset, diagnostic equipment moving parts, rehabilitation equipment traction mechanism.
Industrial automation: conveyor belt tensioning, robot arm reset, fixture, counter, valve actuator.
Fitness equipment: core components of tensioners and resistance training equipment.
Office equipment: paper feed mechanism of printers, reset of scanner cover.
Toy models: drive mechanism, reset of movable parts.

**Key parameters (customizable according to needs):

* **Material:** High carbon steel (such as SWP, SWC), stainless steel (SUS304, SUS316), piano wire, oil quenched and tempered alloy steel wire, etc.
* **Wire diameter (d):** Wide range to meet different tension requirements.
* **Outer diameter (D)/inner diameter:** Multiple specifications are available.
* **Free length (L0):** The original length of the spring when it is not stressed.
* **Initial tension (Fi):** The minimum tension required for the spring coil to start to separate.
* **Spring stiffness/elastic coefficient (R):** The tension required per unit deformation (N/mm or lbf/in).
* **Maximum working stroke:** The safe stretching length allowed.
* **Maximum tensile force/limit load:** The maximum tensile force that the spring can withstand.
* **End form:** Standard hook type or fully customized.
* **Surface treatment:** Select according to environmental requirements.

Why choose our extension springs?

Professional technical support: Our engineering team can provide you with selection guidance and custom design services to ensure that the springs are perfectly matched to your application.
Strict quality control: From raw materials to finished products, strict quality inspection standards are implemented to ensure the performance consistency and reliability of each spring.
Flexible production: Support small batch trial production to large-scale mass production to meet your different needs.
Quick response: Efficient supply chain and customer service system to ensure timely delivery.