Tandem Constant Force Coil Double Hung Window Balance

PivotTrue® fully assembled Constant Force Coil window balance system for Single Hung or Double Hung vinyl windows.

Each Coil has a number, letter or both stamped near the beginning of the J-shaped spring.

The numbers on coils identifies the size /weight range. Double coils have 2 coils with letters or numbers on each that range between 4 and 10.
Some Pivot Lock Shoes have a color coded stripe that indicates the weight range

The Zinc cam in the Pivot lock shoe is designed to use a round head Pivot Bar and will work with other shapes.
Pivot Bars are available with assorted lengths, shapes and hole patterns to accommodate various manufactures.

Coil Size/Number Combinations (one coil / next stacked coil) (will be stamped as a number, letter or both on the actual metal coil):
5C/5CL, supports 19-20 pounds when installed in pairs - may have red stripe on bottom
4B/5CL, supports 17-18 pounds when installed in pairs - may have brown stripe on bottom
5C/6DL, supports 21-22 pounds when installed in pairs - may have blue stripe on bottom
6D/6DL, supports 23-24 pounds when installed in pairs - may have yellow stripe on bottom
6D/7EL, supports 25-26 pounds when installed in pairs - may have blue stripe on bottom
7E/7EL, supports 27-28 pounds when installed in pairs
7E/8FL, supports 29-30 pounds when installed in pairs - may have orange stripe on bottom
8F/8FL, supports 31-32 pounds when installed in pairs - may have white stripe on bottom
9J/9JL, supports 35-36 pounds when installed in pairs
10K/10KL, supports 39-40 pounds when installed in pairs

How to calculate / choose the correct balance (if you cannot read or find number on coil)
1. Weigh the window sash (The window sash is the part of the sliding window that moves up and down, it includes the frame and glass).
2. Purchase 2 of the assembly that is correctly sized to support the weight of your sash.
Example: if you have a 24lb window sash, you need 2 of the 6D/6DL assemblies.
*Note: each number corresponds to pounds it can support; so a 6D/7EL assembly features one coil that supports 6 lbs and one coil that supports 7 lbs. With one assembly on each side of the window, those assemblies can support a window up to 26 lbs because 6 + 7=13, and then 1 on each side = 26.