Extension Spring are used primarily for storing and returning mechanical energy. This page lists the industries and assemblies where they are specified, the selection criteria that matter for each application, installation practice, and the cases where a different fastener type is the correct choice. Parts are supplied to ISO / DIN. Stocked across roughly M0.8 to M4, they cover light-duty and instrument-scale work.
Typical Applications for Extension Spring — ISO / DIN (Series 143)
The most common settings where these are specified:
- 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.
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Mechanisms & latches: return and detent forces in moving assemblies.
How to Specify Extension Spring — ISO / DIN (Series 143) for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M0.8–M4; 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 ISO / DIN. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Where Extension Spring — ISO / DIN (Series 143) 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.