Torsion Spring for Flight Attendant Seat

This torsion spring series serves as the core elastic element in folding, backrest-return and locking mechanisms of aircraft flight attendant seats. Utilizing torsional deformation of the arm around the spring’s central axis, it stores and releases angular energy to provide stable torque for backrest recline, tray table stowage, armrest locking and other seat adjustments. The spring body is precision-wound from 17-7PH precipitation-hardening stainless steel wire—offering high strength and exceptional fatigue resistance, making it the premier choice for aerospace and high-load, high-frequency precision applications. Type 316 stainless steel is available for humid or corrosive environments; Type 304 suits general anti-corrosion needs. Wire diameter, mean diameter, active coils, arm length/angle and winding direction (left/right) are fully customizable per seat model, with end arms formable into straight, angled, hooked or looped configurations. Manufactured on CNC coiling machines with stress-relief heat treatment, surfaces can be passivated, electropolytically polished, or zinc/nickel plated for optimal corrosion resistance and dimensional consistency.

Material selection and protection strictly adhere to HB 7047 (General Requirements for Civil Transport Aircraft Passenger Seats)​ and HB 8393 (Specification for Civil Aircraft Cockpit Seats and Restraint Systems): metal parts shall be corrosion-resistant or surface-protected against electrochemical corrosion; non-metallic sheaths/bushings, where applicable, shall meet flammability and smoke-toxicity requirements. Every finished spring undergoes dimensional inspection, torque testing and fatigue testing to ensure stable torque output and reliable service life—a critical guarantee for the precise actuation and long-term dependable operation of flight attendant seat adjustment mechanisms.