RS PRO Stainless Steel Extension Spring 35 mm Free Length 7 mm OD 1N Initial Tension 821-504

RS PRO 821-504 Stainless Steel Extension Spring features a 35 mm free length and 7 mm outside diameter, engineered for industrial and commercial applications requiring reliable tension resistance. Manufactured from high tensile stainless steel, this extension spring is designed with side hook ends to securely attach while absorbing and storing energy efficiently.

The spring provides an initial tension of 1 Newton and a spring rate of 0.13 Newton per millimeter, allowing it to extend to a maximum length of 101.5 mm. It complies with industry standards BS 1408 CR3 and DIN 17223, ensuring consistent mechanical performance and RoHS compliance for environmental safety.

This extension spring is commonly used in robotics, automotive interiors and exteriors, garage door assemblies, lever mechanisms, trampoline systems, washing devices, farm machinery, window screen installations, pool cover tensioning, and upholstery applications such as sofa bed systems. Its right-hand helix and looped ends are precisely wound to provide optimal resistance to pulling forces, making it suitable for a broad range of mechanical assemblies requiring dependable tension springs.

Constructed from robust stainless steel for durability and corrosion resistance. Side hook ends enable secure and easy integration into assemblies. Initial tension of 1 Newton provides immediate load resistance upon installation.

Spring rate of 0.13 N/mm controls extension up to 101.5 mm maximum length. Complies with BS 1408 CR3, DIN 17223 standards and RoHS environmental guidelines. Manufactured in the United Kingdom ensuring quality craftsmanship.

Highly suited for both commercial and domestic mechanical applications. Energy absorbing tension spring with a right-hand helix design for precision.

RS PRO products are stringently tested to meet demanding industry standards and trusted worldwide by engineers for quality and reliability. Explore our extensive range of Extension Springs to find the perfect solution for your industrial or commercial requirements.