What is BS EN 13906-2 - Extension springs design calculation about?  
Extension springs store energy and act as a pull between two processes, making them suitable for a number of products. The BS EN 13906 series focuses on cylindrical helical springs made from round wire and bar. The BS EN 13906 series details calculations for designing cylindrical helical springs, to ensure appropriate application.
BS EN 13906-2 is the second part of the cylindrical helical springs multi-series and focuses on extension springs. BS EN 13906-2 specifies the calculation and design of cold and hot coiled helical extension springs made from round wire and bar, loaded in the direction of the spring axis and operating at normal ambient temperatures.
Who is BS EN 13906-2 - Extension springs design calculation for? 
BS EN 13906-2 on cylindrical helical springs made from round wire and bar is useful for: 
- Automotive, aerospace, and consumer goods industries
- Manufacturers and suppliers of extension springs
- Designers of extension springs
BS EN 13906-2 is also useful for manufacturers and designers of tools, appliances, and machines that use extension springs as components such as:
- Automotive interiors and exteriors
- Tools such as vice-grip pliers
- Carburettors
- Trampolines
- Washing machines
- Agricultural machinery
- Toys
Why should you use BS EN 13906-2 - Extension springs design calculation?  
The mechanism for extension springs allows for versatile applications.
BS EN 13906-2 provides guidance on design principles in order to optimize the dimensions of the spring by taking into consideration the needs and providing appropriate working space.
BS EN 13906-2 guides you with the design and calculator, to save you the hassle of manually computing all of the formulae and equations. This helps you to ensure that your design features the right spring dimensions for excellent performance during usage.
What’s changed since the last update?
BS EN 13906-2:2013 supersedes BS EN 13906-2:2001 which is withdrawn. BS EN 13906-2:2013 includes some technical and editorial changes with respect to BS EN 13906-2:2001. These include: 
- Updating the normative references
- Technical corrections
