30" Series 306 Spiral Balance

Product Code: S306-30

30" Series 306 Spiral Balance
Main product image of the S306-30 30" Series 306 Spiral Balance
Detail view of balance shoe
How to identify a replacement spiral balance
Quantity Price
1-11 $11.23
12-49 $10.11
50-99 $9.55
100-249 $8.98
250+ $8.42
Please Note: Bulk pricing applies only to purchases of the same option
green tip green tip
add $0.25
red tip red tip
Product Description
This is a Series 306 spiral balance for non-tilt windows. It moderates the operation of your window sash to allow the window to stay open when raised.
  • This balance has a 30 long metal tube. When determining the length, do not include the attached fitting; only measure the metal tube.
  • Comes with an attached 15-066 bottom shoe.
  • The strength you need should be indicated as a color tip at the end of your old metal tube. If you do not see a color tip weigh your sash on a scale and refer to the chart below.
  • The metal tube measures 3/8" in diameter.
  • Can work for either the left or right side of the window interchangeably.
  • Spiral window balances come fully lubricated and ready to be charged.

  • Color Tip Sash Weight Range
    Red 10 to 22 lbs
    Green 14 to 26 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.
Good Idea!
Balances are sold individually, however, it is a good idea to replace both window balances at the same time. Pairing a new balance with an old one would cause the new balance to wear out faster.
Helpful Tip!
You should choose the color tip that matches the color tip of the balances you are replacing. If you do not see the tip color available in 'options' or you are unsure of which color to choose: ask our experts for help.
Customer Questions & Answers
Discussion # Of Replies Last Post Date
Spiral Balance Won't Hold Up Sash Weight 2 Feb 5, 2018
Correct color codeThis discussion includes image(s). 5 May 22, 2017
Assistance pleaseThis discussion includes image(s). 2 Nov 1, 2016
Tip colorThis discussion includes image(s). 2 Oct 26, 2016
Spiral Balances Are "Springing" When Closed 4 Jul 26, 2016
Replacement 30 inch balance rodsThis discussion includes image(s). 2 Mar 24, 2016
S306-30 don't work 2 Jan 8, 2015
Keller window spiral balance replacement 3 Nov 24, 2014
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