How to Wind a Garage Door Spring Safely
Winding or replacing a garage door torsion spring is a high-tension mechanical task. Reasonable mechanical aptitude and experience is required to complete this task. Springs store significant energy and can cause serious injury if handled incorrectly. Physical capability to handle the spring force is required. This guide is for informational purposes only. If you are unsure at any step, stop and consult a qualified garage door technician. Use only purpose-built winding bars — never substitute with screwdrivers, rebar, or other improvised tools.
Why the Right Tool Matters when Winding Torsion Springs
A torsion spring winding bar (also called a winding tool or winding rod) fits into the winding cone at the end of your spring. Using a bar that is the wrong diameter, too short, or the wrong material creates serious risks:
- Slipping — a loose fit in the winding cone can cause the bar to kick out under tension.
- Inadequate leverage — a bar that is too short gives you poor control and increases physical strain.
- Bar material — bars designed for torsion spring winding are made of specified steel types that can withstand greater forces before bending or failing.
Choosing the Correct Bar Size
Two dimensions determine the right bar for your spring: the winding cone hole diameter and the bar length.
Hole Diameter
Measure the inside diameter of the winding cone holes on your spring. Common sizes are 5/8" for large commercial size springs, 1/2" (most common for residential) and 7/16" (less common). The bar must fit snugly — not loosely — into those holes.
- 5/8" holes → 5/8" diameter bar Torquewinder T6624 (large commercial door springs)
- 1/2" holes → 1/2" diameter bar Torquewinder T5518 & T5524 (most residential door springs)
- 7/16" holes → 7/16" diameter bar Torquewinder T5418 (less common springs for smaller doors)
If you are unsure of your cone size, measure with calipers before ordering. A bar that is even slightly undersized can slip under load.
Torquewinder bar diameters are sized to seat firmly in the cone, giving you the control and predictability needed for this job.
Torquewinder spring-assist helps the bar to fully insert more quickly and stay engaged whenever both bars are inserted.
Bar Length
Torquewinder tools are available in 18" and 24" lengths. Longer bars provide more leverage and are preferred for higher-tension springs (heavier doors). Shorter bars are easier to maneuver in tight headroom situations. When in doubt, the longer bar gives you more control.
Spring Winding Guide
- Confirm you have the Torquewinder tool with correct bar diameter before beginning.
- Wear safety glasses. Stand to the side of the spring, never directly in front of or below it.
- To replace a garage door torsion spring, carefully follow all instructions provided by garage door spring manufacturer, beginning with procedures to disconnect power and operator travel arm, secure door in place and unload tension from springs.
Always verify winding bars are inserted to full depth of winding cone holes. Torquewinder spring-assist helps the bar to fully insert more quickly and stay engaged whenever both bars are inserted. Torquewinder bar collars provide visual indicator of bar insertion depth.
About Windingbars.com and Torquewinder Tools
Our goal is simple: give professional technicians and DIYers a purpose-built tool that makes this job safer and more controllable than a simple pair of bars.
Professional Grade Construction: Torquewinder tools are made of professional grade hardened steel bars, assembled with zinc plated engineered springs that are protected by a high durability nylon woven sleeve that meets ISO 6945 abrasion standards. With a Torquewinder tool, both bars act as a single tool that is easier and safer to handle than 2 separate bars. Spring-assist helps bar to fully insert more quickly and stay engaged whenever both bars are inserted for predictable and secure operation. Torquewinder is available in a range of diameters and lengths to match the most common residential and light commercial spring configurations sold in North America.
Frequently Asked Questions
Can I use a piece of rebar or a screwdriver instead of a tool or bar sold specifically for winding door springs?
No. Improvised tools are a leading cause of injury during spring winding. They can slip out of the cone under tension without warning. A Torquewinder tool is purpose-built for this fit and this load.
How many turns does my spring need?
The correct number of turns depends on the spring's wire size, inside diameter, length, and your door's weight. Consult the spring manufacturer's chart or a garage door professional for your specific spring — we do not recommend guessing.
This page is provided for educational purposes. Garage door spring work carries inherent risk. Windingbars / Torquewinder makes no warranty regarding outcomes and recommends consulting a licensed garage door professional if you have any doubt about performing this work yourself.