Balance Stamp Option 27 4

Hey there - thanks for your question. That number could indicate a 28-inch balance with the 2740 stamp option. To be sure, please measure the metal channel from metal to metal, not including the plastic ends. To be certain of the stamp option, you can take the sash out of the window and weight it. With a 2740 stamp, the sash should weigh between 19 and 26 pounds. Have you determined which series you need? If not, please send us photos of both ends of your balance.

Let's take a step back.

You need to select the correct option (2730 or 2740) to match the weight of your sash, not vice versa. There is a chart on the S350-27 webpage that lists the options and how much weight they hold. Remove your window sash, weigh it, and choose which option you need based on the weight. The weight of your sash needs to fall within the range listed in the chart. 2730 holds sashes between 13 to 19, and 2740 holds sashes between 19 to 26.

The relation between the marking on the balance and the option is hazy. Usually, you can add a 0 to the end of the marking to get the option, but it needs to be checked by weighing, as I mentioned above. Sometimes the wrong balance is installed to begin with, and sometimes the manufacturer uses a system of marking the balances that clashes with ours.

As a final note, it is greatly likely that your balance measures 28". Please measure the metal alone and compare.