Sash support coil balance spring

Question

Did not find any markings,numbers or names on the right or left sash support coil balance spring(s) which both are required replacing.

User submitted photos of a window balance.

Tom · Accepted Answer

Hello! You're looking at a Series 190 coil here, but we will need the sash weight to determine the necessary spring strength, if you can't find any numbers on the coil. Alternately, the number on the coil will identify which Series 190 coil to purchase.