Extension springs lengthen when a load is applied and are used to keep a system in equilibrium or subjected to a force.
|Wire diameter||0.10 mm to 14 mm|
|Manufacturing capacity||From one-off parts to long runs|
|Secondary operations||Single ring coils Double ring coils Coils with shaped hooks|
|Extension spring examples||Open loop extension spring German loop extension spring Closed loop extension spring Stainless steel extension spring Large loop extension spring Galvanized extension spring English loop extension spring|
|Materials||Mild steel Inconel Stainless steel Brass Spring steel Shape memory alloys Copper Titanium|
|Finishes||Passivated Burnished Chrome-plated White zinc coated Cataphoresis Zinc dichromate plated Epoxy paint|
|Production equipment||Numerically-controlled spring-coiling machines Automatic spring-coiling machines Automatic looping machines Heat treatment air furnaces|