What do the colors on garage door springs mean?

The colors painted on garage door springs follow an industry standard set by DASMA, the Door and Access Systems Manufacturers Association, in its technical data sheet TDS-171. The meaning depends on the spring type. On torsion springs (the ones on a shaft above the door), the cone color shows the wind direction: red is right-wound and black is left-wound. On extension springs (the ones along the side tracks), the color shows the lifting capacity in pounds. The system exists so that installers and parts suppliers across different brands can speak the same language about a spring at a glance. Here is how to read both, and why the color alone is never the whole story.

Torsion spring colors: red and black for wind direction

A torsion spring is wound in a specific direction, and it must be matched to the correct side of the door. The painted winding cone at the end of the spring carries a color that tells you which way it is wound. Under the DASMA code, red marks a right-wound spring and black marks a left-wound spring.

There is a twist that confuses people: the wound direction and the install side are opposite. A red, right-wound spring installs on the left side of the shaft, and a black, left-wound spring installs on the right side, as you face the door from inside. Springs are usually sold and installed as a matched pair, one of each, so a balanced door has one red-coned and one black-coned spring. Some single-spring doors use just one, but two-spring systems are common because they keep the door balanced even if one spring breaks.

Wind direction is only half the information on a torsion spring. The cone color tells you the direction, but it does not tell you the wire size, inside diameter, or length, which together determine how much the spring can lift. That is why a technician measures the spring rather than ordering by color alone. The color confirms the side; the measurements confirm the strength.

Extension spring colors: a chart for lifting capacity

Extension springs use color differently. Here the color tells you the pounds of pull, meaning how much door weight a pair of these springs can lift. The standard DASMA extension-spring color code repeats every 100 pounds, so each color stands for three possible weights. Below is the chart.

Color	Lifting capacity (lbs)
White	10 / 110 / 210
Green	20 / 120 / 220
Yellow	30 / 130 / 230
Blue	40 / 140 / 240
Red	50 / 150 / 250
Brown	60 / 160 / 260
Orange	70 / 170 / 270
Gold	80 / 180 / 280
Light blue	90 / 190 / 290
Tan	100 / 200 / 300

Because each color covers three weight tiers, you still need to know the rough weight class of your door to pick the right one. A red extension spring on a light single door is a 50-pound spring, while a red spring on a heavier door is a 150-pound spring. The pair works together, so both springs must match the door's weight for it to balance.

Why the color code matters and where it falls short

The color code exists so that installers and parts suppliers can quickly confirm two things: that a torsion spring is going on the correct side, and that an extension spring matches the door's weight. Getting either wrong leads to a door that is unbalanced, binds, or wears out fast. A mismatched spring set forces the opener to fight the door and shortens the life of the whole system.

But the colors are a guide, not a complete specification. For torsion springs especially, the color says nothing about the wire gauge, diameter, and length, and those numbers decide the spring's real strength. Two springs can both have a red cone and lift completely different weights. This is why ordering "the same color" is not enough, and why a technician measures the old spring before fitting a new one. The color narrows the field; the measurements pick the exact spring.

There is one more practical note: paint fades, chips, and gets coated in dust and oil over years of use. An old spring's color can be hard to read or worn off entirely. When that happens, measurement is the only reliable way to identify the right replacement, so a faded color is not something to worry about.

How a technician reads your spring beyond the color

When a pro sizes a replacement spring, the color is only the first glance. For a torsion spring, they measure four things: the wire size (the thickness of the steel), the inside diameter of the coil, the overall length of the wound spring, and the wind direction the color confirms. Those four numbers together determine exactly how much weight the spring lifts, and all four must match for the door to balance.

Wire size is measured with a spring gauge or by measuring across a set number of coils and doing the math, because a small difference in wire thickness changes the spring's strength a lot. Inside diameter is usually stamped on the winding cone or measured directly, and common sizes are listed in fractions of an inch. Length is measured along the relaxed spring. Getting any of these wrong leaves the door heavy on one side or floating up on its own.

This is also why "just match the color" fails as a DIY shortcut. Two springs can share a red cone and lift wildly different weights because their wire size, diameter, or length differ. A technician carries a range of springs and the tools to measure, so they can fit a spring that matches the door rather than one that merely looks similar. On many doors they will also recommend upgrading to a high-cycle spring, rated for 20,000 cycles or more, which lasts far longer for a small added cost. The color got the conversation started; the measurements finish it.

Should you replace a spring based on color alone?

No. Use the color as a starting clue, then confirm with measurements. The DASMA code is genuinely useful for spotting wind direction on a torsion spring or the weight class on an extension spring, but it is not enough to order a safe, correct replacement by itself. The strength of a torsion spring comes from its wire size, inside diameter, and length, which the color does not show.

There is also a safety reason to be careful. The Consumer Product Safety Commission warns that wound springs store enough energy to cause serious injury, and replacing them requires winding bars and proper technique. A spring that is the wrong size, even if the color looks right, can leave the door unbalanced and unsafe. This is the main reason spring replacement is treated as a professional job rather than a casual DIY fix.

If a spring on your door has broken or you are unsure what you have, a technician can measure the spring, read the color, and match a correct, properly rated replacement. G Brothers offers same-day spring service across the Denver metro and can confirm the right spring for your exact door, reading the color and measuring the wire to fit a correct, properly rated replacement on the spot.