The U-shaped arms on both ends snap directly into slots or plates, delivering precise and reliable return torque for latch, clamp, and pedal mechanisms.

With arms extending 180° in opposite directions, the arms and multi-coil energy storage deliver powerful, stable return torque for opening and closing mechanisms.

Featuring extra-long dual straight legs with small bent tips, delivering stable torque output for precise return of pedals, covers, and other heavy-load components.

Applied to latch, buckle, and door hinge mechanisms, delivering precise torque through the combination of an L-leg and J-hook for reliable open-and-close return action.

Features an asymmetric design with a single straight leg on one end and a triangular frame leg on the other, combining torque output with structural positioning for precise return and force transmission in complex assembly scenarios.

Applied to hinges and rotational return mechanisms, delivering precise torque output via dual 90° bent straight legs for stable angular control and reliable return action.

Specifically designed for roll-up and sectional garage doors, storing torsional energy to counterbalance door weight and ensuring safe, smooth operation with extended service life.

Applied to precision rotational mechanisms requiring asymmetric torque arm force, the dual differently-shaped arms flexibly accommodate varied anchor points for precise torque output.

Applied to rotational return and angular control mechanisms, storing and releasing torque via dual straight legs to deliver precise restoring force for pivot and hinge structures.

Featuring L-shape right-angle bent hooks on both ends for direct slot or bracket mounting, delivering stable tension without additional connectors.

Manufactured from 304 stainless steel for superior corrosion resistance, delivering stable axial tension via double round-loop ends for precision and outdoor applications with high anti-corrosion requirements.

A heavy-duty extension spring featuring an internally threaded metal end plug on one end and a loop hook on the other, combining bolt-grade rigid fixing with precise elastic tension for high-load industrial applications.