RS PRO Steel Extension Spring, 49 mm Free Length x 7 mm Outside Diameter, Wire Diameter 1 mm, Initial Tension 45.3 751-871

RS PRO 751-871 Steel Extension Spring offers a high-performance fastening solution made from carbon-steel piano wire, providing superior tensile strength and durability. With precise mechanical specs including a free length of 49 mm and a maximum extended length of 81.7 mm, this spring is engineered for applications that involve repeated pulling forces and limited displacement.

The spring's outside diameter measures 7 mm with a wire thickness of 1 mm ensuring reliable elasticity and compact installation footprint. An initial tension of 45.3 N combined with a spring rate of 1.18 N/mm provides consistent and predictable force absorption in dynamic environments.

Designed with closed loops on both ends, the extension spring facilitates secure attachment and easy installation in mechanical assemblies. Ideal for use in industrial machinery components, fluid power tools, retractable doors, trampolines, and other heavy-duty mechanical devices requiring dependable spring tension and resilience.

This product complies with stringent industry standards BS 1408 CR3 and DIN 17223, along with RoHS environmental requirements, making it a trustworthy choice for engineering and manufacturing settings.

Constructed from high-quality steel material for long service life. Free length 49 mm enables precise mechanical fitment. Maximum extension length 81.7 mm accommodates operational range. Outside diameter 7 mm and wire diameter 1 mm offer compact strength.

Initial tension 45.3 N ensures immediate force application. Spring rate 1.18 N/mm delivers consistent load response. Application includes mechanical coupling, retractable doors, and industrial equipment. Manufactured in the United Kingdom with rigorous quality controls.

Explore the RS PRO collection on EnvMart for precision mechanical fasteners and high-grade Extension Springs suitable for various industrial, commercial, and construction uses.