Springs come in a multitude of different sizes. The size of the spring is determined by the weight and the height of the door. This is what balances the door when you open and close door.

All springs are sized by the wire gage, the length and diameter of the spring.

Some garage doors will have springs and they can be different sizes so each spring should be measured individually. Springs are measured and stamped on the spring as follows.

Example for a torsion spring measurement: (.207 x 1 ¾ x 23) .207 = wire gauge, 1 ¾ =diameter, 23 = length of spring. Extension springs used on a solid one- piece door are measured somewhat similar. These springs almost always have a sticker on it that has the size printed on it. They are measured as follows:

The numbers start at 300 and go up to 900. The most common size is 728(700=wire gauge, 28=length of spring). A 300 series is a heavy duty spring and 900 series are lightweight springs.

Extension springs for a sectional door are measured in color coding and length of spring.

The color painted on spring determines the wire gauge and whatever the length of spring is.

If you had to measure your spring yourself you can measure 20 coils of spring and count the number of inches between the 20 coils. This will give you a coil gauge size without having a tool that measures wire thickness. Then measure length of spring without adding the silver metal ends or spring. These are called the cones and they screw into the ends. If spring is broken just put both broken pieces together when you measure length. Then measure how wide the circle of spring or diameter.

Every time customers have tried to measure the spring themselves, it’s almost never correct. Just leave it to the professionals.