31" SERIES 751 CHANNEL BALANCE

A handy person from stow ohio says:
my channel measures 31 but has 28HD stamped on it.
Which do I need to order?
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Paul from SWISCO responded:
Could you confirm the length of your metal channel? Based on your stamp, it should be 29" long, not 31".
A home owner from Stow ohio says:
The entire channel is 31 and the stamping is 28 hd
User submitted a photo of a window balance.
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Casey from SWISCO responded:
To determine the option you will need for a 31" Series 751 balance, remove the window sash and place it on a scale.

This series 751 ribbed channel balance also known as a block and tackle balance has a 31" long metal ribbed channel and is for a tilt window. This balance comes fully assembled with a 15-014 shoe. The channel width measures 9/16" but is considered 1/2" in the trade.
Stamp Option Sash Weight Range
30R 15 to 23 lbs
30HD 23 to 29 lbs
30TG 29 to 36 lbs
*This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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