What do the color codes on garage door springs mean?

Code one: the cones (direction, not size)

Look at the cast fittings on each end of a torsion spring. Industry convention paints the winding cone red on a right-wound spring and black on a left-wound spring. On a standard two-spring residential door, the left-wound spring mounts on the right side of the center bracket and the right-wound on the left (yes, crossed; the springs must unwind in opposite directions to lift together). This is the color code that prevents the classic install error: a spring of the wrong wind simply cannot be tensioned correctly on that side of the door. Gold or other colors on some cones are manufacturer-specific, which is one more reason color alone never finalizes an order.

Code two: the stripe on the coil (wire size)

That band of paint sprayed on the spring body is a DASMA-standard shorthand for wire diameter. Each color maps to specific wire sizes, but here is the catch that surprises homeowners: the palette repeats as sizes climb. The same color that marks one lighter wire also marks a heavier wire several steps up the chart. The stripe was designed for pros who already know roughly what class of spring they are holding and just need a fast visual cross-check, not as a complete specification. Two springs with identical stripes can be meaningfully different springs.

That is why every legitimate spring order still starts with the tape measure: 20 coils measured to the sixteenth of an inch, inside diameter read off the cone stamp, and overall length, the full process from how spring sizing works. When our techs quote a spring replacement in Norman or Nichols Hills, the stripe gets a glance and the calipers get the final word.

Code three: extension spring ends (lift weight)

Extension springs, the stretchy type above the horizontal tracks in older OKC homes, use paint on the end loops to state pull capacity in a repeating ladder of colors stepping up in 10-pound increments. A homeowner replacing a 120-pound-rated spring with whatever the hardware store had in stock inherits a door that either slams or floats. If you are still running extension springs, two sibling answers matter more than the color chart: safety cables (non-negotiable) and whether to convert to torsion (usually worth it when real money is about to be spent).

What the colors will not tell you

• Cycle rating. A 10,000-cycle and 25,000-cycle spring for the same door can wear the same stripe class; cycle life lives in the length and wire relationship, not the paint.
• Age or remaining life. Paint fades in a hot Oklahoma garage but steel fatigue is invisible. A vivid stripe on a 12-year-old spring means nothing.
• Quality. Economy import wire and premium oil-tempered wire get painted the same colors.

Treat the colors as the spring's name tag, not its resume. If you want to know what is actually on your shaft and how much life it likely has left, a maintenance inspection answers it with measurements, and estimates are always free anywhere in the 21-city metro area.