Bob from SWISCO responded:
May 26, 2021
Thanks for writing in. You are correct, this is an S350-27. Regarding the stamp option, 2650 is indeed the correct choice based on that stamp option. You actually wouldn't want to go with a higher grade. These stamp options designate a very specific weight range the balance is calibrated to support. Anything calibration stronger than your window sash's exact weight will result in a sash that's actually too difficult to close or keep closed; it will keep drifting upward on you, and be quite difficult (if not impossible) to shut! So sticking with the original stamp is always best. |