Sash window Channel replacement requirement

Question

Good Day! I require some help regarding a replacement number to order parts. I have 5 windows requiring replacement channel. I know by the stamp that it is a 2730 but the not the other number required.
Thanks

Bob · Accepted Answer

Thanks for posting! That stamp tells us the strength of the channel balance, but not its identity, which is determined by the end attachments. It looks like the bottom fitting has wings, or those side tabs, while the top one does not. Is that accurate? If so, I believe this is an S350-28, with a stamp option of 2730. Let me know if you have further questions.