Constant balance

Contractor from Puerto Rico

Oct 30, 2026 10:14 am

Need this for 3 tilt in single hung windows of 42 width x 54 height window with 1/4" glass . About 24 pounds . 1-1/4" x 1/2" shoe . Don't see any markings in the coil .

2 user uploaded images

4 Replies

Bob from SWISCO

Nov 1, 2026 1:50 am

Hey there. This might be the 15-111 Pivot Shoe. Please compare. Please tell us the width of the coil springs. It should be 1/2" or 3/8". That will narrow all else down.

Contractor from Puerto Rico

Nov 1, 2026 8:38 am

One of the coils have a 4 stamped , the other one , is not stamped . The coil is 1/2"

Bob from SWISCO

Nov 1, 2026 11:10 am

Thanks for posting again. If the springs are 1/2" thick then they're the Series 160 springs. A spring stamped '4' might mean you need the S160-04 4.5 pound spring. But the best thing to do is weigh the window sash. Weigh the sash, divide it in half, and that'll tell you the weight support needed on both sides of the window. The video below explains.