Quick answer
A torsion spring system is the set of springs, shaft, drums and cables mounted above a garage door that twists to store energy and lifts the door’s weight when it opens.
DASMA calls the full assembly a power unit. The springs do the lifting, not the opener. When the system is balanced, a heavy door feels light enough to raise by hand.
Quick facts
The key facts about Torsion Spring System, with sources:
- Where it sits
- On a shaft above the door opening, on the header 1
- How it works
- One end of the spring is turned while the other is held, which builds torque 1
- Typical rating
- 10,000 cycles for a standard residential spring (maker’s figure) 9
- One cycle
- Fully closed to fully open and back to closed 1
- Color code
- Paint on the spring marks wire size; black means not on the list 3
Key takeaways
- Torsion springs sit on a steel shaft above the door and twist to lift it.
- The springs carry the door’s weight; the opener only starts and guides the motion.
- Springs are rated in cycles, not years. Most standard home springs carry a rating of about 10,000 cycles.
- A broken torsion spring stays on its shaft, so the shaft gives built-in containment.
- Winding, adjusting and replacing torsion springs is work for a trained technician. Never DIY.
What a torsion spring system is
Most modern sectional garage doors are lifted by torsion springs. DASMA, the door industry’s trade group, defines a torsion spring as one that works by turning one end around its long axis while the other end is held, which builds torque 1. Torque is twisting force.
The spring never works alone. DASMA’s terminology sheet calls the complete set a power unit: springs, shaft, winding plugs, stationary cones, drums and cables 1. That bundle is what people mean by a torsion spring system.
You will also hear it called a front-mounted spring, since it usually mounts on the wall above the door 1. A rear-mounted version sits at the back of the horizontal tracks on some low-headroom doors 1.
The job is balance. A sectional door can weigh well over 100 pounds.
The springs are wound so their pull roughly equals that weight, so a person or a small motor can move the door with little effort.
DASMA calls this kind of system a counterbalance system: one that offsets the door’s weight so less force is needed to open and close it 1.
How a torsion spring lifts a door
When the door is closed, the springs are wound tight. Each spring is fixed at one end to a center bearing bracket on the header through a stationary cone. The other end, the winding cone, is locked to the shaft with set screws 1.
Lift cables run from the bottom corners of the door up to grooved cable drums at each end of the shaft. As the door rises, the springs unwind and turn the shaft.
The drums wind the cable on and pull the door up 1. When the door closes, its weight turns the shaft the other way and winds the springs back up, ready for the next lift.
The force a spring delivers per turn is called its torque rate, written IPPT (inch-pounds per turn). DASMA defines total torque, or MIP, as IPPT times the number of turns: the torque needed to lift a given door from the floor 1.
- Torsion shaftCarries the torque to the drums
- Winding coneLocks the working end of the spring to the shaft
- Stationary coneAnchors the fixed end to the center bracket
- Center bearing bracketHolds the shaft and spring to the header
- Cable drumsWind the lift cables as the shaft turns
- Lift cablesRun from the drums to the bottom brackets
Source: [1]
MIP = IPPT × turns
IPPT- Inch-pounds of torque the spring adds per full turn
Turns- How many times the spring is wound
MIP- Maximum inch-pounds: total torque to lift the door from the floor
Definitions from DASMA TDS-160. The real numbers come from the door maker’s chart; this is not a sizing tool.
Source: [1]
Types of torsion spring setups
| Setup | What it is | Where you see it |
|---|---|---|
| Single spring | One spring on the shaft, usually off center | Lighter single-car doors |
| Two springs | One spring on each side of a center bracket | Most double-car and heavier doors 9 |
| Duplex spring | Two springs of different sizes, one inside the other 1 | Heavy doors with little room for spring length |
| Triplex spring | Three springs nested inside each other 1 | Very heavy commercial doors |
| Double shaft | Two shafts when more spring length is needed 1 | Large commercial doors |
| Rear mount | Springs at the back of the horizontal tracks 1 | Some low-headroom installs |
| High-cycle spring | Springs built for more cycles on busy doors 1 | Doors used many times a day |
Example: what a 10,000-cycle spring means in years
Springs are rated in cycles. Amarr, a door maker, says residential springs are 10,000-cycle springs 9. DASMA defines one cycle as fully closed to fully open and back to closed 1. Here is the plain arithmetic for three households.
| Household use | Cycles per year | Years to reach 10,000 cycles |
|---|---|---|
| 2 cycles a day (one round trip) | 730 | 13.7 |
| 4 cycles a day (two commuters) | 1,460 | 6.8 |
| 10 cycles a day (door used like a front door) | 3,650 | 2.7 |
Years = 10,000 ÷ (cycles per day × 365). This is a ceiling, not a forecast. DASMA lists handling, installation and climate factors that cut life short 2. Try your own numbers in the spring life calculator.
Where to find it on your door and your quote
Stand inside the garage with the door closed and look up at the wall above the opening.
A torsion system is the long coiled spring (or two) wrapped around a steel bar, with a round drum at each end of the bar.
DASMA says a spring warning tag should hang on the spring or its bracket 4 5.
On the spring itself you may see a dab of paint. DASMA’s official color codes mark torsion spring wire diameter, and black means unspecified or not on the list 3. Color is only a partial ID; inside diameter, length and material are not encoded 3.
On a quote, look for lines such as “replace torsion springs (pair),” a wire size, an inside diameter, a length, and a cycle rating. A clear quote names the cycle rating. See how to read the rest in our guide to choosing a company.
Sample of DASMA’s torsion spring color codes
| Wire diameter (inches) | Color |
|---|---|
| .1920 | Orange |
| .2070 | Yellow |
| .2187 | White |
| .2253 | Red |
| .2340 | Brown |
| .2437 | Green |
| .2500 | Gold |
| .2625 | Blue |
| Not on list | Black |
Benefits and drawbacks of torsion springs
Benefits
What a torsion spring cannot do
A spring is tuned to one door weight. Paint, added trim or new glass can push a door past what its springs were sized for.
DASMA lists a door heavier than the maker’s specification as a cause of shorter spring life, and says only a trained technician should weigh the door, after disabling the counterbalance 2.
A higher cycle rating also does not guarantee a longer life. DASMA says spring cycle life may not match door cycle life, and other parts can stop the door first 2.
What drives the cost of torsion spring work
We do not quote prices here. These are the factors that move a spring quote. For sourced figures see our garage door cost guide and the spring cycle ratings study.
- Cycle rating. Higher-cycle springs use thicker, longer wire, so the parts cost more.
- One spring or a pair. Many technicians replace both springs on a two-spring door so they wear evenly.
- Door weight and size. Heavier doors need bigger springs and sometimes duplex or triplex sets 1.
- Worn related parts. Frayed cables, worn drums or bearings are often replaced on the same visit.
- Conversion from extension springs. Switching systems adds a shaft, drums and brackets.
- Emergency or after-hours calls.
Ask for the cycle rating in writing
A clear spring quote lists wire size, inside diameter, length and the rated cycles. If a quote only says “new springs,” ask for those four numbers.
How a technician replaces torsion springs
Torsion spring replacement is professional work. The steps below help you follow the job; they are not instructions.
- Confirm the door type, weight and current spring sizes against the maker’s chart.
- Release the stored tension safely with proper winding bars, never screwdrivers.
- Fit new springs that match the door’s counterbalance needs, per the maker’s instructions 2.
- Wind the correct number of turns, in the correct direction, as the maker specifies 2.
- Check cable tension on both drums and adjust the door’s balance.
- Run a balance check and, if an opener is fitted, test the auto-reverse with a 2x4 laid flat 7.
- InspectDoor, cables, drums, bearings
- UnloadRelease tension with winding bars
- FitSprings matched to door weight
- WindTurns and direction per maker
- BalanceDoor holds halfway open
- Test2x4 reversal test if an opener is fitted
See what a professional spring job involves on our spring repair page.
Keeping a torsion system healthy
- Look at the springs every few months from the floor. A gap in the coils means a break.
- Keep the door closed in harsh weather where you can. DASMA says doors left open expose springs to heat, moisture and air quality swings 2.
- Lubricate springs only as the door maker’s written instructions say 2.
- Avoid harsh chemicals near springs. DASMA notes chlorine-based acids can corrode them 2.
- Do not hang things from the door or add weight to it 2.
- Book a yearly tune-up with a technician; see preventive maintenance.
Warning signs and when to call a pro
Signs of trouble: a loud bang from the garage, a visible gap in a spring, a door that feels very heavy, a door that will not stay up, a door that rises crooked, or an opener that strains and stops.
Amarr notes that a broken torsion spring usually stays on the shaft, while the door becomes hard to lift 9.
If a spring is broken, stop. DASMA says not to operate the door until the spring is replaced, and not to remove, repair or adjust springs, cables, brackets or anything they are fastened to 4.
Never adjust or replace a torsion spring yourself
Torsion springs are under extreme tension. DASMA says spring repairs and adjustments must be done by a trained door systems technician with proper tools 4. Do not run the opener or lift a door with a broken spring, and keep people out from under it.
Standards and rules that apply
No federal law sets spring cycle ratings. The 10,000-cycle figure is what makers state for residential springs 9. DASMA publishes voluntary guidance: TDS-190 on what shortens spring life, TDS-171 on color codes, and TDS-172 on the spring warning tag that should be fixed to the spring assembly 2 3 5.
If the door has an opener, the federal opener rule (16 CFR 1211) requires the opener to reverse on contact and to have a second entrapment safeguard. That rule assumes a balanced door; DASMA says safe operation depends on a balanced door and working entrapment protection 8 4.
On wind-rated doors, swapping a spring or part for one that is not identical can weaken a certified assembly, and the certifier may void the rating 6.
Torsion springs vs related terms
| Term | How it lifts | Containment if it breaks |
|---|---|---|
| Torsion spring system | Twists on a shaft above the door | Held on the shaft 4 |
| Extension spring system | Stretches along the horizontal tracks 1 | Needs a containment cable through each spring 4 |
| Counterbalance system | Umbrella term for whatever offsets door weight | Depends on spring type |
| Counterweight system | Weights instead of springs 1 | Rare on homes |
| Opener | Moves a balanced door; does not carry its weight | Not applicable |
Myths about torsion springs
- Myth The opener lifts the door.
- Reality The springs lift the weight. The opener moves a door the springs have already balanced.
- Myth Springs last a set number of years.
- Reality They are rated in cycles. Years depend entirely on how often the door runs 9.
- Myth A higher cycle rating always means longer life.
- Reality Only if the spring is matched and installed right. DASMA lists wrong turns, wrong door weight and poor handling as life-shorteners 2.
- Myth Color codes tell you everything about a spring.
- Reality Color shows only wire size for torsion springs, not inside diameter, length or material 3.
What changes where you live
Climate matters more than code here. DASMA names extreme heat or cold, frequent precipitation and salty coastal air as conditions that shorten spring life, and advises keeping doors closed where possible in those climates 2. In hurricane zones, replacement parts on a wind-rated door should match the certified assembly 6.
When a torsion spring decision comes up
You face this choice when a spring breaks, when you replace a door, or when you upgrade from extension springs. If the door runs many times a day, ask about higher-cycle springs.
If the door is heavy or recently changed (new glass, paint, trim), ask the technician to confirm the springs still match. Then compare options with the repair or replace tool.
- If A spring is broken
- Then Stop using the door and call a technician
- If Door runs 6+ times a day
- Then Ask for a higher-cycle spring
- If Door got heavier (glass, paint, trim)
- Then Ask for the springs to be checked against the new weight 2
- If Door has extension springs and no containment cable
- Then Ask about cables or a torsion conversion 4
Two springs, one wears out
On a two-spring door, both springs have done the same number of cycles. Ask whether replacing the pair makes sense so you are not back for the second one soon.
Questions about Torsion Spring System
What is a torsion spring on a garage door?
A torsion spring is a coiled steel spring mounted on a shaft above the door. It twists as the door closes and unwinds as the door opens, turning drums that wind the lift cables. It carries the door’s weight so the door feels light.
How long do garage door torsion springs last?
They are rated in cycles, not years. Amarr says residential springs are 10,000-cycle springs. At two cycles a day that is about 13.7 years; at ten a day, about 2.7 years. Handling, installation and climate can shorten that, per DASMA TDS-190.
Can I replace a torsion spring myself?
No. Torsion springs store enough energy to cause serious injury or death. DASMA says spring repairs and adjustments must be done by a trained door systems technician using proper tools and instructions. Call a professional.
How do I know if my torsion spring is broken?
Look for a visible gap in the coils, a loud bang from the garage, a door that suddenly feels very heavy, or an opener that strains and stops. Do not operate the door. Keep people clear and call a technician.
Is a torsion spring better than an extension spring?
Torsion systems are common on modern doors because the shaft contains a broken spring and lifts both sides evenly. Extension springs fit where there is no room above the door, but each needs a containment cable through its center, per DASMA TDS-167.
Should both torsion springs be replaced at the same time?
Often, yes. On a two-spring door both springs have done the same cycles, so the second is usually near the end too. Replacing the pair keeps the door balanced. Ask your technician to explain the choice for your door.
What do the colors on a torsion spring mean?
DASMA’s official color codes mark a torsion spring’s wire diameter. Black means unspecified or not on the list. Color is only a partial ID: it says nothing about inside diameter, length or material, and DASMA says it is not for homeowners replacing springs.
What is a high-cycle torsion spring?
A counterbalance spring with increased cycle life for high-usage doors, in DASMA’s terms. They use thicker, longer wire so each cycle stresses the steel less. They cost more but suit doors that run many times a day.
Why does my garage door feel heavy?
A door that suddenly feels heavy usually has a broken or weak spring, or a cable problem. The springs carry the weight, so when they fail you feel the whole door. Stop using it and have a technician inspect it.
Does a torsion spring need lubrication?
Follow your door maker’s written instructions. DASMA says regular greasing or lubrication of springs, where the instructions call for it, helps maximize cycle life. Do not touch springs beyond what the manual allows.
Sources
- DASMA Technical Data Sheet #160, Sectional Garage Door Terminology, retrieved .
- DASMA Technical Data Sheet #190, Factors Affecting Spring Cycle Life, retrieved .
- DASMA Technical Data Sheet #171, Official Color Codes for Torsion and Extension Springs, retrieved .
- DASMA Technical Data Sheet #167, Residential Sectional Garage Door and Electric Operator Checklist for Home Inspectors and Consumers, retrieved .
- DASMA Technical Data Sheet #172, Garage Door Labels, retrieved .
- DASMA Technical Data Sheet #183, Garage Door Component Substitution, retrieved .
- DASMA Technical Data Sheet #369, Frequently Asked Questions Regarding Automated Residential Garage Door Systems, retrieved .
- 16 CFR Part 1211, Safety Standard for Automatic Residential Garage Door Operators (eCFR, current), retrieved .
- Amarr, Your Complete Guide to Garage Door Springs (Feb 27, 2023), retrieved .
Expert review
Written by the HyreGarage Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Definitions from DASMA TDS-160; spring life factors from TDS-190; color codes from TDS-171; safety rules from TDS-167 and TDS-172; cycle rating from Amarr; years computed as rating ÷ (cycles per day × 365).
Suggest a correction. We fix errors and say what changed.