Collection: Extension Springs

Extension springs manufactured are designed to resist tensile loads, available with English hooks across a wide range of dimensions and spring rates. Materials include steel and stainless steel. All springs are listed with full technical specifications including free length, maximum extension length, spring rate and initial tension. Use the filters or ask Springy to find the right spring, or contact us for bespoke requirements.

Wire Ø d (mm)
Outer Ø Do (mm)
Free length L0 (mm)
Spring rate R (N/mm)
Material
 
 
Extension spring dimension diagram
dWire diameter — thickness of the spring wire
DoOuter diameter — outside width of the spring coil
L0Free length — length of the spring at rest, unloaded
RSpring rate — force required to extend the spring by 1 mm (N/mm)
LnMaximum extension length — length at maximum permissible load
FnForce at Ln — force (N) exerted at maximum extension length
Loading springs…
Part No. d (mm)i Do (mm)i L0 (mm)i R (N/mm)i Ln (mm)i Fn (N)i Material In stock Price / pc Ex. VAT
Loading springs…
No springs match your filters — try adjusting the values above.