Swivel hook extension springs

Swivel hook extension springs, also known as a Rotatable carabiner stretch spring, is a type of spring with a special structure and function.

When we use the Swivel hook extension springs, one of the more common problems we encounter is the fracture of the hook. Hooks can break for many reasons, but the main cause is the stress created when bending the wire to form the hook. Turning the hook upward will cause the wire in the area to weaken, and if the stretched spring receives a lot of stress, even if the rest of the spring is able to withstand the load, the hook will also break. But what’s the use of a stretch spring with a broken hook?

If the pressure is expected to be large, it is best to request the use of a rotary hook, the idea of a rotary hook is to use a larger wire than the spring body and a smaller outside diameter to make the hook stronger. To make a rotary hook, it is usually necessary to shape the nail into a hook and then cone-shape the spring body to wrap around the bottom of the nail. In this way, the hook is free to rotate or rotate from the spring body itself.

Swivel hook extension springs are tightly wound spiral coils that require a certain force to pull the coils apart, which is called initial tension. They provide resistance while pulling and usually form a hook at both ends. The most common types of hooks for stretch springs are the regular and extension types, with some designs requiring more complex configurations depending on the application.

swivel hook extension springs manufacturer

The difference between different types of hooks:

hook-type	Design	Advantage
Extension hook	The hook length of the extension spring is usually more than 110% larger than the inner diameter of the body coil	Generate more spring force to meet the load requirements
Conventional hook	The hook length of a conventional hook extension spring is usually 80% smaller than the inner diameter of the body coil	The most economical hook design
swivel hook	The Swivel hook extension springs consists of two different parts, the first part is the main coil and the second part is two “S” rings (one at each end of the spring). The “S” ring is manufactured separately, in the final process of tapering the end body coil around the end of the “S” shape, and is installed in the body coil at both ends. The “S” shapes at both ends are hidden within the end body coil and are trapped during use so as not to be pulled out of the spring.	Thanks to custom design, the configuration is unlimited.
Special hook shape	Special hook stretch springs depend on design or application needs.	Thanks to custom design, the configuration is unlimited.

The carabiner part of the swivel hook extension springs can be rotated, which makes the spring flexibly adapt to different installation angles and positions in the application, improving the convenience and adaptability of use.

Due to the use of spring steel and other high-quality materials, the swivel hook extension springs has the characteristics of stable structure, strong and durable, can withstand a certain tension and pressure, not easy to deformation or fracture.

The rotary hook stretch spring is reasonably designed, easy to install and disassemble, and not easily damaged during use, so it can be reused and reduce the use cost.