RS PRO Steel Extension Spring 85.5 mm Free Length x 18 mm Outside Diameter, Initial Tension 237 N, Spring Rate 4.27 121-365

RS PRO 121-365 Steel Extension Spring is a precision-engineered tension spring with a free length of 85.5 mm and an outside diameter of 18 mm. Made from high tensile steel wire, this spring exhibits a strong initial tension of 237 N and a spring rate of 4.27 N/mm, allowing it to resist and absorb pulling forces effectively. It is designed with hook-ended wire for secure attachment.

Manufactured to meet standards including RoHS, DIN 17223, and BS 1408 CR3, this extension spring combines durability with safety compliance. Its maximum extended length of 133.1 mm provides versatility in various mechanical assemblies.

Widely used across industrial, mechanical, and commercial sectors, applications include robotics, automotive interiors and exteriors, garage door assemblies, lever mechanisms, trampoline springs, washing devices, farm machinery, toys, and upholstery tension mechanisms. The spring’s robust design facilitates longevity and reliable performance in demanding environments.

RS PRO's stringent quality control ensures each spring meets high standards for resilience and safety. This steel extension spring is a dependable component for engineering and manufacturing projects requiring precise and consistent tensioning.

Constructed from high-quality steel for enhanced strength. Side hook wire ends for secure tensioning and energy storage. Maximum extended length of 133.1 mm for broad operational applications. Conforms to RoHS, DIN 17223, and BS 1408 CR3 standards.

Suitable for use in robotics, automotive, farm machinery, and commercial devices. Right-hand helix winding for optimal mechanical performance. Provides consistent initial tension of 237 N for precise force control. Manufactured in the United Kingdom with high-quality craftsmanship.

This RS PRO Steel Extension Spring is a reliable solution for engineers needing a resilient tension spring for diverse industrial and mechanical applications. Explore the EnvMart catalog to find related Extension Springs and other mechanical components from leading brands.