RS PRO Steel Extension Spring, 78.5 mm Free Length, 18 mm Outside Diameter, 630 N Initial Tension 121-393

RS PRO 121-393 Steel Extension Spring is engineered from high tensile strength steel music wire, providing robust performance with a free length of 78.5 mm and an outside diameter of 18 mm. This extension spring features a right-hand helix winding and looped ends to absorb and store energy efficiently, making it ideal for applications requiring resistance to pulling forces.

The spring's initial tension is rated at 630 N, with a spring rate of 35.8 N/mm, and it can extend to a maximum length of 93.5 mm. Manufactured to meet DIN 17223 and BS 1408 CR3 standards, and compliant with RoHS directives, it ensures quality and reliability.

These springs find broad industrial use including automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, trampolines, washing devices, and agricultural machinery. The oiled finish enhances resistance to corrosion, extending lifespan even under demanding conditions.

Made in the United Kingdom, this spring represents high-quality mechanical fasteners trusted in various industrial and mechanical machinery applications. Manufactured from high tensile steel music wire for durability. Free Length of 78.5 mm with maximum extended length of 93.5 mm.

Outside diameter measures 18 mm with a wire diameter of 3.6 mm. Initial tension of 630 N and spring rate of 35.8 N/mm. Complies with DIN 17223, BS 1408 CR3 standards and RoHS certified. Oiled finish for corrosion resistance and long service life.

Right-hand helix winding with looped ends for secure attachments. Suitable for automotive, garage doors, pliers, carburetors, trampolines, washing devices, and farm machinery. For further industrial fasteners and springs, explore the Extension Springs category at EnvMart.