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How to Correctly Measure Garage Door Torsion Springs
Use this guide to identify your replacement torsion spring by markings, wire size, inside diameter, coil length, and wind direction before ordering.
Important: Selecting the wrong torsion spring can prevent the door from operating correctly and can place unnecessary strain on the door, cables, drums, hardware, and opener.
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Do Not Have an Existing Spring to Measure?
Use a spring recommendation or calculation process if you are installing springs on a new door, replacing a spring that may already be incorrect, or do not know the correct spring size. In these cases, do not guess from another door or order only by door width and height.
Use a spring calculation
A new-spring calculation normally requires complete door data and hardware information rather than measurements from an old spring.
Ask us to confirm the correct spring
Send the available spring measurements, door details, and clear photos so our team can help review the application before you order.
Safety Notes
Do not loosen set screws
Do not loosen the set screws on the winding cone. A wound torsion spring can release force violently.
Do not place hands near loaded hardware
Keep your hands away from the cones, cables, and drums while the spring is under tension.
Do not continue if something looks unsafe
If hardware is bent, broken, loose, or unstable, stop and contact a qualified garage door technician.
The measurements in this guide are intended to help you identify the correct spring without disturbing the system. If you are not experienced with garage door repairs, we strongly recommend having measurements, installation, and spring replacement handled by a qualified technician.
What You Need to Measure
To identify a replacement torsion spring correctly, you must confirm these four specifications. Before that, always check the old spring for existing size markings because that may speed up the process.
Markings
Printed or stamped size markings may already identify the spring.
Wire Size
The most important measurement because it determines spring torque.
Inside Diameter
Measure the hollow center of the coil. Do not include the cones.
Length + Wind
Measure relaxed coil length and confirm left-hand or right-hand wind.
Step 0: Check for Spring Markings First
The easiest way to identify your spring is to look for printed or written markings on the spring itself. If the spring has a clear marking, use it as a starting point and then confirm the other dimensions if needed.
If there are no markings, continue through the measurement steps below. Many torsion springs in the field have no readable size marks, faded paint, or markings that are no longer reliable.
Step 1: Find the Wire Size
Why wire size matters
Wire size has a direct effect on spring torque and door balance. Even a small difference in wire size can produce the wrong lifting force and lead to an unsafe or poorly balanced door.
Use 10 coils and 20 coils
Measure the length of 10 coils. Then measure 20 coils and confirm that both numbers point to the same wire size in the chart.
1. Choose a clean section
Measure where the coils are touching tightly with no gaps and where the spring is not damaged.
2. Measure 10 coils
Use a tape measure to capture the full length of exactly ten coils in decimal or fractional inches.
3. Measure 20 coils
Use the 20-coil measurement as a cross-check. If the 10-coil and 20-coil values do not align, measure again.
Wire Size Reference Chart
| Wire Size | 10 Coils | 10 Coils Metric | 20 Coils | 20 Coils Metric |
|---|---|---|---|---|
| .192 | 1 15/16" | 4.92 cm | 3 7/8" | 9.84 cm |
| .207 | 2 1/16" | 5.24 cm | 4 1/8" | 10.48 cm |
| .218 | 2 3/16" | 5.56 cm | 4 3/8" | 11.11 cm |
| .225 | 2 1/4" | 5.72 cm | 4 1/2" | 11.43 cm |
| .234 | 2 3/8" | 6.03 cm | 4 3/4" | 12.07 cm |
| .243 | 2 7/16" | 6.19 cm | 4 7/8" | 12.38 cm |
| .250 | 2 1/2" | 6.35 cm | 5" | 12.70 cm |
| .262 | 2 5/8" | 6.67 cm | 5 1/4" | 13.34 cm |
| .273 | 2 3/4" | 6.99 cm | 5 1/2" | 13.97 cm |
| .283 | 2 7/8" | 7.30 cm | 5 3/4" | 14.61 cm |
| .295 | 3" | 7.62 cm | 6" | 15.24 cm |
| .306 | 3 1/16" | 7.78 cm | 6 1/8" | 15.56 cm |
| .312 | 3 1/8" | 7.94 cm | 6 1/4" | 15.88 cm |
| .331 | 3 5/16" | 8.41 cm | 6 5/8" | 16.83 cm |
| .343 | 3 7/16" | 8.73 cm | 6 7/8" | 17.46 cm |
| .362 | 3 5/8" | 9.21 cm | 7 1/4" | 18.42 cm |
| .375 | 3 3/4" | 9.53 cm | 7 1/2" | 19.05 cm |
Common DASMA Spring Color-Code Examples
| Color Code | Wire Size Range | Metric Range |
|---|---|---|
| Orange | .120 / .192 / .273 / .363 / .485 | 3.00 / 4.20 / 6.25 / 8.00 / 11.10 mm |
| Light Blue | .200 / .283 / .375 / .490 | 4.50 / 6.40 / 8.10 / 11.50 mm |
| Yellow | .207 / .289 / .394 / .500 | 4.60 / 6.50 / 8.40 / 11.70 mm |
| White | .218 / .295 / .406 / .531 | 4.70 / 6.80 / 8.80 / 12.00 mm |
| Red | .225 / .297 / .422 / .563 | 4.80 / 7.00 / 9.20 / 12.30 mm |
| Brown | .234 / .307 / .431 / .625 | 5.00 / 7.30 / 9.60 / 13.00 mm |
| Tan | .238 / .313 / .438 | 5.25 / 7.35 / 10.00 mm |
| Green | .244 / .319 / .453 | 5.50 / 7.50 / 10.50 mm |
| Gold | .250 / .331 / .462 | 5.75 / 7.60 / 10.70 mm |
| Purple | .257 / .594 | 6.00 / 12.50 mm |
| Blue | .188 / .262 / .344 / .469 | 4.00 / 6.05 / 7.80 / 11.00 mm |
Step 2: Measure the Inside Diameter (I.D.)
Measure across the hollow center of the spring from the side view. Do not include the stationary cone or winding cone.
Measure the inside opening directly
Place the tape measure or caliper across the empty space in the center of the spring from inside edge to inside edge.
Use outside diameter if needed
I.D. = O.D. - (2 × wire size)
Example: 2.414" outside diameter - (0.207" × 2) ≈ 2.000" inside diameter.
Step 3: Measure the Spring Length
Measure the coil body only
Measure the coil body from end to end. Do not include the stationary cone or winding cone in the measurement.
Add the coil sections together
Lay the broken pieces in a straight line, align them end-to-end, and add the coil-body lengths together to get the relaxed spring length.
Step 4: Confirm Wind Direction
Wind direction is listed as right-hand wound or left-hand wound. This is especially important on single-spring systems.
Always verify wind before ordering
If you order the wrong wind on a single-spring system, the spring will not function correctly.
Standard left/right arrangement
Viewed from inside the garage looking out: the left-side spring is typically right-hand wound, and the right-side spring is typically left-hand wound.
Check cone color markings
Many winding cones use color marks that help identify wind direction, but always verify with the actual spring orientation.
Why Accurate Measurements Matter
Door Balance
The wrong wire size or inside diameter can create too much or too little lifting force and can throw off the door balance.
Hardware Wear
An incorrectly balanced door can damage the opener, cables, drums, hinges, bearings, and other hardware over time.
Correct Length
Measuring a spring while it is wound can give the wrong length, which leads to incorrect spring selection.
Cycle Life
Most standard residential torsion springs are rated around 10,000 cycles. If your door sees heavy daily use, a higher-cycle spring may be a better choice.
Measurement Checklist
Enter your measurements below, then print or copy them to send to our team. This makes it easier to verify the correct spring before you buy.
Ready to Order Replacement Torsion Springs?
Once you have confirmed the wire size, inside diameter, spring length, and wind direction, you can shop replacement springs with confidence. If you are still unsure, contact us and we can help review your measurements first.
Safety Notice & Disclaimer
Garage door torsion springs, extension springs, cables, and related hardware are under extreme tension. Improper installation, adjustment, or repair can result in serious injury, property damage, or death.
If you are not experienced with garage door repairs, we strongly recommend having installation, replacement, and adjustments performed by a qualified garage door technician.
This page is intended to help identify the correct spring safely from a measurement standpoint. Any attempt to install, repair, replace, or adjust a garage door or its components is performed entirely at your own risk. Best Garage Door Parts and its affiliates assume no responsibility or liability for any injury, death, property damage, or losses resulting from the use or misuse of our products, instructions, or information. By purchasing and using our products, you acknowledge these risks and accept responsibility for their installation and use.