Window Balance 29 4 BW CMC 7

Home Owner from FL

Nov 8, 2017 11:39 am

Need help identifying which replacement balance I need. My broken balance is 30" long and has the part number 29 4 BW CMC 7.

User submitted photos of a window balance.

4 Replies

Tom from SWISCO

Nov 14, 2017 10:27 am

I think, depending on the depth of the bottom shoe, this is S351-30 or S390-30. The difference lies in the shoe. Measure as shown below. If you get 1", choose Series 351 and if you get 1-1/8", choose a Series 390 channel balance.

Comparison of 15-001 & 15-002

Quick Learner

Nov 14, 2017 10:49 am

Different than 351 or 390. Maybe 60. Just hate ordering wrong parts. Thought #s would helpful

Tom from SWISCO

Nov 16, 2017 2:41 pm

Ah, it looks like your top attachment is winged. How about our Series 395 balance? This looks like it could be a match.

The stamp only indicates the spring strength calibration. The nylon attachments can only be identified by comparing their physical design and size.