RS PRO Steel Extension Spring 61 mm Free Length, 14 mm OD, 2.8 mm Wire, 400 N Initial Tension, 121-371

The RS PRO 121-371 Steel Extension Spring is a precision-engineered mechanical component designed to provide reliable extension force in a range of mechanical, industrial, and engineering applications. Manufactured from high tensile piano wire carbon steel, this extension spring features a robust construction with looped ends for secure and hassle-free integration into assemblies such as lever mechanisms, automotive assemblies, washing devices, and other tension-based apparatus.

With a free length of 61 mm, a 14 mm outside diameter, and a 2.8 mm wire diameter, the spring delivers consistent performance under demanding conditions. Its substantial 400 N initial tension and high spring rate of 27.9 N/mm ensure dependable force delivery, making it ideal for demanding operations where precise tension control is required. The spring is further capable of reaching a maximum extended length of 73.2 mm, providing flexibility for diverse design requirements.

The extension spring is manufactured in compliance with DIN 17223 Class C and BS 1408 CR3 standards, which define material quality and tolerances to guarantee product reliability and repeatability. Its clockwise-coiled design and lubricated surface optimize coiling action and longevity, minimizing service interventions and promoting trouble-free operation throughout its service life.

Commonly used in automotive exteriors and interiors, white goods, lever-operated devises, and various mechanical assemblies across industrial, manufacturing, and maintenance environments, this RS PRO steel extension spring combines rugged specifications with strict quality standards. The included looped ends facilitate quick and secure mounting, accommodating integration within complex assemblies.

Industrial professionals may select this spring for projects requiring durable tension force, reliable resistance to pulling forces, or energy storage in mechanical or automated installations. Its compliance with RoHS directives and established mechanical standards offers additional assurance of safe and recognized performance.

Free length: 61 mm supports medium stroke extension requirements. Outside diameter: 14 mm ensures compatibility with common mounting geometries. Wire diameter: 2.8 mm delivers structured rigidity and load strength. Initial tension: 400 N for strong resistance to extension forces.

Spring rate: 27.9 N/mm allows application in precision-controlled force applications. Standards: Meets DIN 17223 Class C, BS 1408 CR3 and RoHS compliance. Explore a comprehensive selection of mechanical springs and industrial components in the Extension Springs category from RS PRO and other leading brands on EnvMart.