Resources
Specification guides and sourcing notes for buyers of custom springs.
Garage door torsion springs: how to specify wire size, inside diameter and wind direction
Six values determine a counterbalance spring. Here is what each one does, and the mistakes that make an ordered spring not fit.
Small-batch custom springs: how prototype and low-volume orders actually run
What to expect on quantity, tooling and lead time when you need a few hundred springs rather than a few hundred thousand.