Garage Door Extension Springs With Cables, 7' High Door (Pair Or Single)

Garage Door Extension Springs With Cables, 7′ High Door  (Pair Or Single)
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Description
Spring Weight Chart
More Info
Garage
door extension springs are made specifically for a door height. For
example, extension springs for 7′ high garage doors generally cannot
be used with 8′ doors. When you use an extension spring with a
taller door, the spring will have to stretch farther to allow the
door to close. This affects the lift of the springs as well as how
long the spring will last.
Because
of the pulley system, the extension spring’s stretch is 1/2 of the
door height. A common stretch for an 7′ high door is 25 X 42.
The
42 indicates that the difference between the spring length when the
door is open and when it is closed is 48 inches. Two times 42 inches
is 84 inches, which is 7 feet (the door height).
The
other number indicated by the stretch of an extension spring is the
spring length. In the example above, the 25 refers to a spring
length of 25 inches when the spring is compressed.
Though
there are often multiple spring lengths for a given door height,
longer springs tend to be used on taller garage doors.
Extension
springs are also designed to lift a certain amount of weight.
An
80-pound extension spring, for example, will lift 80 pounds.
Because
of the pulley system, however, it only lifts 40 pounds of door
weight. The extension spring on the other side of the door will lift
another 40 pounds. Therefore, two 80-pound extension springs are
used on a garage door that weighs 80 pounds.
Garage
door extension springs are also color-coded. The lifts for extension
springs follow these colors:
Brown
60#
Orange
70#
Gold
80#
Lt. Blue
90#
Tan
100#
White
110#
Green
120#
Yellow
130#
Blue
140#
Red
150#
Brown
160#
Orange
170#
Gold
180#
Light Blue
190#
Tan
200#
White
210#
Green
220#
Yellow
230#
Blue
240#
Red
250#
This
pattern is repeated through all the lift categories. For example, a
90#, a 290#, a 390# and a 490# will all be painted light blue on one
end.
All
of our overhead door extension and torsion springs are
proudly “made in the USA” and include
a
two year Extended warranty against premature failure
Use
the drop down list to choose the proper weight rated spring for your
door
Don’t
Know the weight of your door? Disconnect the springs and opener
and Use a bathroom scale to weigh the door.
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