Coil replacement

Handy Person from Boone, Iowa

Jul 24, 2026 3:27 pm

My coil broke in 1 of my vinyl replacement windows. It is a double hung, left side, lower window. It is stamped 7.5 31". There are other numbers on it but much has been worn away. I can still make out, "AT52320".

3 user uploaded images

2 Replies

Bob from SWISCO

Jul 30, 2026 9:35 pm

Hey there. The pivot shoe looks like the 15-111. If the coil spring is 1/2" thick, it's a Series 160 Coil Balance spring. A 7.5 stamp means you'd need the S165-07 7.5 pound spring. For new housing see the 15-150S. Let me know fi you have questions.