Left and Right Window Balance BSI 17 A

Question

Hi. I need 4 window counter balance units. Metal to metal length is 18" and the width is exactly 1/2".. I believe the Swisco part number is S351, but would like to have you verify this for me.. There is a stamping on the metal guide BSI 17A if that helps at all. No wings on the top slider and the bottom slider measures 1 1/8" deep.

User submitted photos of a window balance.

Tom · Accepted Answer

Thank you for your interest in SWISCO hardware. It looks like you either need Series 351 or Series 390 channel balance. The difference between the series 351 and series 390 balances lies in the shoe. The series 351 channel balance has the 15-002 shoe while series 390 channel balance has the 15-001 shoe. The 15-001 shoe is 1 1/8" from front to back. The 15-002 is 1" from front to back.