Replacement of balance spring 1/2 x 1/2x 29 inches

Quick Learner from Minneapolis MN 55447

Jun 16, 2026 6:17 pm

These are balance spring of old K&K windows. Plastic balance shoes are black on the aluminum spring cover is the written 28HDK and more which I can not identify. I need 4 pices like that.

4 user uploaded images

2 Replies

Casey from SWISCO

Jun 25, 2026 12:14 pm

Hello,

Your balance resembles the S751-29 (28HD). Review the specifications compared to your assembly. Thanks for posting!

How to measure the length of the Series 751 channel balance.

Close up view of the S751 balance shoe.