Types of Garage Door Springs: Torsion or Extension?
Torsion springs twist above the door; extension springs stretch beside the tracks. Those are the two types of garage door springs, and the difference that matters most is containment: a broken torsion spring stays on its steel shaft, while an extension spring relies on a safety cable through its coil. Compare how each works, the torsion spring types, headroom, sizing and when to call a technician.
What are the different types of garage door springs?
Residential garage doors use two types of springs: torsion springs, which twist on a steel shaft above the door, and extension springs, which stretch alongside the horizontal tracks. Both counterbalance the door’s weight so it lifts by hand or by opener.
The springs, lift cables and drums (or pulleys) make up the counterbalance system. The springs do the lifting; the opener only moves a door that is already balanced. Both types break from wire fatigue, and a snapped spring replacement always covers the pair.
Torsion spring vs extension spring: what is the difference?
A torsion spring stores energy by twisting and turns cable drums on a shaft above the opening; an extension spring stores energy by stretching and pulls cables over pulleys beside each track. The shaft contains a broken torsion spring; extension springs need safety cables.
Garage door extension springs and torsion springs do the same job, lifting the door’s weight, from different places and with different safety containment.
| Attribute | Torsion spring | Extension spring |
|---|---|---|
| Where it sits | On a steel shaft above the door opening | Beside each horizontal track |
| How it stores energy | Twisting | Stretching |
| Parts it drives | Shaft and two cable drums | Pulleys and lift cables |
| Springs per door | 1 or 2 | 2 (one per side) |
| When it breaks | Stays on the shaft | Held by a safety cable through the coil |
| How it is identified | Wire size, inside diameter, length, wind direction | Color code for door weight per pair, 50–300 lb |
| Headroom needed (Clopay) | 12 in with standard torsion hardware | 10 in with standard extension hardware |
| Wall-mount jackshaft opener | Compatible | Not compatible |
| Who replaces it | Trained door systems technician, in pairs | Trained door systems technician, in pairs |
The row that matters most on a broken door is containment. A snapped torsion spring stays on its shaft, where a broken torsion spring shows from the floor as a gap in the coil. A snapped extension spring stays put only while its safety cable is in place.
Neither type suits every garage. A torsion spring keeps a break contained on its shaft and is the only type a wall-mount jackshaft opener can turn. Extension hardware fits in less headroom than standard front-mount torsion hardware, as the table shows.
How do torsion springs work on a garage door?
A torsion spring works by twisting as the door closes and unwinding as it opens, turning the shaft and the two cable drums that reel in the lift cables. One or two springs per door balance the full door weight.
The spring wraps a steel shaft, typically 1 in across, that runs the width of the door above the header. One end of the spring is fixed to a center bracket bolted to the wall; the other end, the winding cone, grips the shaft. A cable drum sits at each end of the shaft, and a lift cable runs from each drum down to a bottom corner of the door. A 4 in standard-lift drum suits doors up to 8 ft tall.
Closing the door pulls the cables off the drums, which turns the shaft and twists the spring tighter. Opening it lets the spring unwind, turning the drums so they reel the cables back in and lift the door.
A heavier door carries two springs. The right-wound spring sits left of center and the left-wound spring sits right of center, so each one twists the right way. Enclosed systems follow a similar count: TorqueMaster uses two springs on a double door and one on most single doors.
What types of torsion springs do garage doors use?
Garage doors use three torsion spring layouts: standard torsion springs on a shaft above the header, rear-mount torsion springs at the back of the horizontal tracks for low headroom, and enclosed torsion springs housed inside a steel tube, such as Wayne Dalton TorqueMaster.
Within those layouts, torsion springs also differ by winding method, wire finish and construction.
- Standard (front-mount)
- One or two springs on the shaft above the opening, each coil in plain view.
- Rear-mount
- The springs sit at the back end of the horizontal tracks. Clopay’s instructions offer it for low-headroom doors, because front mount needs more headroom.
- Enclosed
- Wayne Dalton TorqueMaster houses the springs inside a steel tube, so no coil shows above the door.
- Drive-wound
- Clopay EZ-Set is wound through its own drive mechanism instead of winding bars. The spring still twists to store energy, so it counts as torsion.
- Wire finish
- Oil-tempered springs have no protective coating and rust in time, DASMA notes; galvanized and powder-coated springs carry a coating that slows rust.
- Duplex
- One spring nested inside another for extra lifting power, a construction spring makers such as Service Spring build.
Every layout holds the tension that lifts the whole door, so the type changes the parts a technician brings, not who does the work.
What is an extension spring on a garage door?
An extension spring is a long coil spring running beside each horizontal track that stretches when the door closes and contracts to pull it open. Each spring works through a pulley and a lift cable, with a safety cable threaded through its center.
The fixed end of each spring hangs from the track bracket near the back wall of the garage. The moving end carries a pulley. A lift cable runs from the bottom corner of the door, over a pulley at the front of the track, around the spring’s pulley and back to an anchor. As the door comes down, the cable stretches the spring; as it goes up, the spring contracts and draws the door open.
Extension springs always come in twos, one per side. Each carries a paint color that tells the technician what door weight the pair is rated for: DASMA’s color code runs from 50 lb to 300 lb in 10 lb steps. The safety cable threaded through the coil and anchored at both ends is what keeps a broken spring from whipping across the garage.
Which garage door spring do I need?
The spring a door needs is set by the door’s weight, height and drum, so the existing spring is measured, not guessed.
Four checks from the floor tell you which type the door has. That is the first thing a technician asks on the phone.
Spring location
Above the header on a shaft means torsion. Along the ceiling beside each track means extension.
Spring count
One or two over the door is torsion. Exactly two, one per side, is extension.
Paint color
A stripe of paint on a torsion cone or an extension spring’s end is a size or weight code the technician reads.
Sealed tube across the header
A closed tube with no visible coil is an enclosed torsion system such as TorqueMaster.
Look, do not touch: the checks work from the floor with the door closed.
How are garage door springs sized?
A torsion spring is sized by four measurements, wire size, inside diameter, length and wind direction, and an extension spring by a color code for the door weight it lifts per pair. A technician measures the old spring and checks the door’s weight, because a spring of the wrong size lifts the wrong load.
- Wire size
- The thickness of the wire. DASMA’s TDS 171 color chart spans .1200 to .6250 in, and common residential sizes include .234, .250 and .262 in.
- Inside diameter
- The opening of the coil, commonly 1-3/4, 2, 2-1/4 or 2-5/8 in.
- Length
- The coil body in inches. With wire size and diameter it sets the lift and the cycle life.
- Wind direction
- Seen from inside the garage, a right-wound spring sits left of center, often with a red cone, and a left-wound spring sits right of center, often with a black cone.
- Cycle rating
- 10,000 cycles is standard. High-cycle springs rated 25,000 to 100,000 or more use heavier, longer wire, and technicians stock them.
- Color code
- Extension springs carry a paint color for the door weight per pair, from 50 to 300 lb in 10 lb steps.
A pair sized to the door leaves it balanced, which the garage door balance test checks.
Are torsion springs dangerous?
Yes, torsion springs are dangerous to handle because they hold the torque that balances the whole door. The shaft keeps a broken torsion spring from flying loose, but winding, unwinding or removing one releases that energy, which DASMA reserves for trained technicians.
Extension springs carry the same stored energy in a different form. DASMA’s TDS 167 inspection checklist treats an extension spring with no containment cable as a failed item, because a spring that breaks without one has nothing to hold it. For both types, DASMA’s answer on whether to change out garage door springs yourself is the same: trained technicians only.
Found a broken spring? Leave the door closed, unplug the opener and keep people and cars clear. The cones, drums, cables and bottom brackets all hold spring tension: leave every one of them to the technician.
Knowing the type tells you what a repair involves, not whether to attempt it.
When to call a technician about a torsion or extension spring
Call when you see a gap in a torsion coil, an extension spring hanging on its safety cable, a slack lift cable, or a door that suddenly feels too heavy to lift and stops a few inches off the floor. Tell us which type the door has and whether it is open or closed. Technicians fit missing safety cables on extension-spring doors, service enclosed TorqueMaster-style springs and convert extension springs to torsion.
Torsion or extension, the spring work begins only after you agree to the stated price. Spring calls booked by 12 pm, Monday to Saturday, get a same-day inspection visit. Someone answers the phone at any hour, every day, and the visit carries no trip fee. Call (833) 752-1196.
Typical spring repair prices and what moves them are on the cost page.
Next: how long garage door springs last, in cycles and years.