Black Oxide Special-Shaped Rectangular Frame-Arm Torsion Spring
One end short leg for positioning and one end large rectangular frame arm for force transmission, purpose-built to deliver stable large-contact-area torque output and precise return for latch bolts, shift forks, and clutch mechanisms.
Integrally cold-formed from high-quality spring steel wire, the rectangular frame arm shares the same material and strength as the coil body with no welded joints. The large rectangular frame arm significantly expands the contact area with the force-receiving component, distributing concentrated stress across the full frame perimeter and greatly reducing the risk of arm-end deformation and localized fatigue fracture — ideal for applications subject to complex lateral forces. Black phosphate surface treatment provides a solid corrosion-resistant base while reducing metallic surface glare for an industrial aesthetic. Two size variants accommodate different lock and mechanism assembly requirements.
Rectangular frame arm with large contact surface effectively distributes stress and prevents local deformation and fatigue fracture.
Integral cold-forming with no welded joints for high overall strength and reliability.
Black phosphate treatment for corrosion resistance and a low-profile industrial appearance.
Tightly wound coil for stable linear torque output supporting high-frequency reciprocal motion.
Two size variants in the same series to fit different lock and mechanism installation dimensions.
Frame arm dimensions, wire diameter, and torque angle fully customizable per technical drawings.
Application areas: Automotive door lock bolt return / Motorcycle gear shift fork spring clip / Industrial lock clutch mechanisms / Mechanical equipment pedal stop spring arms / Heavy-duty hardware snap-fit opening and closing mechanisms
