Product Specification

Single Torsion Spring with Hooked Legs | High Torque Precision Coil Spring | Custom Size Stainless Steel / Carbon Steel | Durable & Long Cycle Life

Product Description

The Single Torsion Spring with Hooked Legs is a precision-engineered mechanical spring designed to deliver controlled rotational force and reliable return motion. It operates by storing energy when twisted and releasing torque as it returns to its original position. This type of torsion spring features hooked or bent legs, allowing secure installation and stable engagement with mating components.

Manufactured using high-quality stainless steel or carbon spring steel, our single torsion springs are designed for high torque output, consistent angular performance, and long fatigue life. Advanced coiling and heat-treatment processes ensure excellent dimensional accuracy and mechanical stability, even under repeated load cycles.

These springs are widely used in hinges, latches, clips, levers, and rotating assemblies, where precise angle control and dependable return force are required. Both standard designs and fully custom specifications are available to meet different application requirements.

Features

• High torque output with precise rotational control

• Hooked leg design for secure mounting and reliable force transfer

• Excellent fatigue resistance and long service life

• Custom wire diameter, coil size, leg length, and leg angle available

• Suitable for left-hand or right-hand winding

• Stable performance under repeated cycles

• Manufactured with strict quality control and dimensional consistency

Technical Parameters

Applications

Single torsion springs with hooked legs are commonly used in applications requiring controlled rotational force and reliable return motion, including:

• Hinges for doors, covers, and lids

• Clips, clamps, and fastening mechanisms

• Latches and locking systems

• Home appliance internal mechanisms

• Automotive interior and functional components

• Tools, hardware, and mechanical assemblies

• Industrial equipment and automation devices

Their compact design and customizable geometry make them ideal for both light-duty and industrial-grade applications.

Customization

We provide OEM and ODM customization services to meet specific design and performance requirements. Custom options include:

• Wire diameter and material selection

• Inner and outer coil diameter

• Number of active coils

• Leg shape, length, and angle

• Winding direction (left or right)

• Torque and working angle design

• Surface treatment and corrosion protection

Customers can submit drawings, samples, or application details, and our engineering team will assist with design optimization and manufacturability evaluation.

Support and Services

• Professional technical consultation before ordering

• Engineering support for spring design and optimization

• Rapid prototype and sample production

• Strict quality inspection before shipment

• Long-term supply support for mass production orders

Our experienced team ensures reliable communication and consistent product quality throughout the project lifecycle.

Packing and Shipping

• Standard packing: PE bags + cartons

• Custom packaging available upon request

• Bulk or separated packing options

• Suitable for sea, air, and express shipment

• Export-standard packing to prevent deformation during transit

Shipping methods and lead time depend on order quantity and destination.

FAQ

Q1: Can you manufacture custom single torsion springs?
Yes. We specialize in custom torsion springs based on drawings, samples, or application requirements.

Q2: What materials are available?
Common materials include stainless steel (SUS301 / SUS304 / SUS316), carbon steel (65Mn), and music wire.

Q3: What information is needed for a quotation?
Wire diameter, coil diameter, number of coils, leg length and angle, material, torque requirement, and quantity.

Q4: Do you provide samples before mass production?
Yes. Samples or prototypes can be provided for approval before bulk manufacturing.

Q5: What is the typical lead time?
Sample production usually takes 7–10 days. Mass production lead time is generally 15–25 days, depending on quantity and complexity.