RS PRO Steel Extension Spring 87.2 mm Free Length x 12 mm Outside Diameter Model 121-321

RS PRO 121-321 Steel Extension Spring is a high-quality tension spring designed for industrial and commercial applications. It has a free length of 87.2 mm and an outside diameter of 12 mm, manufactured from durable steel material that ensures long-lasting performance.

This spring features side hooks at each end, facilitating secure attachment and efficient energy absorption, which enables resistance against pulling forces. The maximum extended length of 134.8 mm allows flexibility in use while maintaining structural integrity.

The initial tension of 21.05 N and a spring rate of 2.52 N/mm provide reliable load resistance and precise force control. These characteristics make it suitable for mechanisms such as garage doors, automotive interiors, trampoline assemblies, lever mechanisms, and much more.

Manufactured in compliance with DIN 17223, RoHS, and BS 1408 CR3 standards, this extension spring promises consistent quality and safety. Its construction using a right-hand clockwise helix and high-tensile strength steel wire contributes to dependable service life typically expected between 7 to 9 years.

The spring’s side hook design aids application in automotive and mechanical devices. Energy absorption capability supports efficient mechanical function. The spring’s tension and extension resistance are finely tuned for industrial use.

Compliance with international standards ensures safety and reliability. Application versatility includes robotics, farm machinery, window screens, and upholstery tension springs.

This steel extension spring is an essential component for engineers and technicians seeking quality springs for robust mechanical operations. RS PRO assures durability and performance that meets demanding industrial requirements.

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