Trying to identify old window balance

Question

Hello,

I'm struggling to find a replacement or id my current (broken) windows balance. The house was built in 1986 and I believe these are the original wood sashes.

Any help greatly appreciated! The only marking is B.S.I 24. The metal piece is 25" long.

Best,
Sean

Emily · Accepted Answer

Hi, Sean.

Your balance looks like our S751-25 which comes attached with the 15-014 shoe. You'll also need to weigh your sash on a scale and refer to the chart under the product description to determine the correct spring strength option for your hardware. Look over the specifications for this part, along with the related video, to see what you think.