This single coil spring washer with a rectangular section, crafted from steel with a bright zinc-plated (BZP) finish, provides enhanced resistance to corrosion and wear, making it ideal for indoor applications and general-purpose fastening. The spring tension design effectively maintains bolt tension and prevents loosening under vibration, ensuring secure, stable fastening in dynamic environments. Durable and economical, this zinc-plated washer is a practical solution for construction, automotive, and industrial use where reliable performance is needed.