spiral balance on non tilt window

Before we can dive right in recommending replacement balances, we will need to see some photos showing the balance out of the window. Since there is no color tip on your original balance, we will need for you to provide the exact weight of the sash. Thank you.

Thank you for the photos. For your window lock, start off with our 90-005. Compare your measurements with ours to see if this is a match. As for the spiral balance our S400-30 should do the trick. The only way to determine the proper color tip bearing would be to remove the sash and weighing it on the scale. The sash part I am referring to is the part that opens and closes the window. If you can not remove it at all to weigh it, as you mentioned, then you have a bigger issue than just the hardware. They should be able to come out to be weighed in cases like these. If you are adamant that the sash can not be removed, then you will need to contact a local window professional to come and assess the window to see if they're bigger matters than just the hardware. 

Ok great. Then you can go with the S400-30 spiral balance with the red tip. 

You're very welcome. We are happy to help.