S-shaped Double Hook Tension Spring — Spring Steel, Reverse Hook with Opening Size: 3.5 mm wire diameter × 37 mm outer diameter × 140 mm free length Shape & ends: S-shaped double hook with reverse hook and opening for quick, secure attachment Material: High-quality spring steel for consistent performance and long service life Key benefits Reliable tension and return: Designed to provide consistent pulling force and stable rebound over repeated cycles, making assemblies operate smoothly. Easy installation and removal: Reverse hook with opening simplifies hooking into place or detaching during maintenance or assembly. Durable and deformation-resistant: Spring steel construction and standard dimensions maintain shape and performance under regular use. What this spring solves Replaces worn or weakened tension springs to restore proper tool or equipment function. Provides a compact, dependable tension element where space and secure hooking are required. Reduces downtime by offering a ready-to-install, standard-size component for repairs and prototypes. Compatible uses and applications Hand tools: Replacement or upgrade for spring mechanisms in pliers, clamps, and other hand-operated tools. Home care equipment: Tension component in appliance doors, small mechanical assemblies, or consumer devices requiring a compact pull spring. Production, R&D and maintenance: Suitable for assembly lines, experimental rigs, prototypes, and routine equipment servicing. Additional notes Standard size and materials make this spring suitable for many general-purpose tension applications listed above. Verify dimensions against your design or replacement part before installation to ensure proper fit and function.