Lawson SH-7700 Window Balance

Question

Hi
I have Lawson SH-7700 windows.
Markings on the channel balance are IMP 35 DS 35 BSI BT. Channel length (metal) is 36". Width and depth are 9/16" each.
Both ends are winged. Channel balance shoe depth appears to be 15-004 with depth of 1-3/32". Rope end has hook. I will appreciate your confirming the correct part number. Thank you.
Andy

Jasmine · Accepted Answer

Thanks for posting! Your balances appear to be the S385-27 channel balance. Given that your stamp is '35 DS 35', it is likely that your sash weighs 35lbs. So you'll need the 3560 stamp which is rated to carry 35 to 39lbs.

This balance like yours has a 1-3/32" shoe.

Close up view of the S385 balance shoe.

This balance like yours has a 1-3/32" shoe.

Close up view of the S385 balance shoe.