The primary duty of Extension Springs is storing and returning mechanical energy. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type. Stocked across roughly M0.5 to M6, they cover light-duty and instrument-scale work.
Typical Applications for Extension Springs
The most common settings where these are specified:
- Mechanisms & latches: return and detent forces in moving assemblies.
- Valves & actuators: controlled closing or opening force.
- Vibration & cushioning: absorbing shock and maintaining contact pressure.
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
- Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
How to Specify Extension Springs for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M0.5–M6; check the full table below for the exact dimensions of each size.
- Material: Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to DIN 2097. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Extension Springs Are Not the Right Choice
Not where a precise, repeatable force is needed without rating the spring, and avoid over-stressing beyond the rated deflection.