This DIY Mechanical Steel Torsion Spring is designed for compact, cycling applications where a reliable action and precise rotational torque are needed. Made from steel, it delivers steady performance in small mechanical assemblies and hobby projects. Key features and specifications Model/dimensions: 1.6x13x45 mm, 90degree torsion spring (also available in 90/180degree variants within the same product line) Wire diameter: 1.6 mm Outer diameter options: 10, 11, 13, 14, 18, 20, 22 mm (this SKU specifies 13 mm OD) Length: 45 mm Material: Steel Function: torsion spring with action mounted on rotary joints Key attributes Functionality: Provides controlled rotational torque and returns to its rest position after actuation Compatibility: Suitable for assemblies that require a 1.6 mm wire torsion spring with an outer diameter of 13 mm and a 45 mm length Size and fit: 13 mm outer diameter variant, 45 mm length; other OD sizes are available in the same product family Material and durability: Steel construction designed for repeated cycling in appropriate indoor environments Performance: Engineered for consistent torque during operation with reliable springback Applications and use cases Small enclosure lids or access panels: provides smooth opening assist and automatic for electronics or tool cases Cabinet or compartment latches in hobby projects: helps secure panels while allowing easy access when needed Hobby robotics and RC model components: suitable for joint assemblies requiring a compact torsion spring with a defined action Notes This listing reflects the 90degree torsion configuration (with 90/180degree variants available in the same product line). Ensure the chosen outer diameter (OD) and length match your mounting hole size and housing cavity for proper fit.