Frequently Asked Questions and Answers about Compression Springs

 

What does spring wire diameter tolerance mean? Standard tolerances for metal wires are related to material specifications (eg DIN1702, EN, etc.). During the winding process, the wire diameter will change slightly.

 

How square is the spring? Generally speaking, the squareness tolerance is less than 3°.

 

What about the spring helix direction? Compression springs are right-handed.

 

Final Step: Compression springs made from piano wire are oil hardened after production to avoid corrosion. For increased corrosion resistance, you can use galvanized steel wire (which can remain corrosion-free in alkaline mist for 96 hours) or stainless steel wire.

For example, AISI302 can remain uncorroded in alkaline mist for 200 hours).

 

Magnetism: Stainless steel wire, unlike piano wire, is slightly magnetic.

 

Linear dependence of spring load: For cylindrical compression springs with equal spacing between the turns, the linearity of spring load lies between 15% and 85% of the maximum stroke.

 

Maximum stroke = natural length - length in fully compressed state.

 

Can the spring work under overload? In order for the spring to work properly, try to avoid applying a force that exceeds the maximum load the spring can withstand. Otherwise the spring will lose its mechanical properties, such as a change in free length.

 

Can the spring bend? When the free length of the spring is greater than four times the outer diameter, it tends to bend, which results in a loss of balance during compression, with the coil in the center of the spring leaning to one side.