▦Window Part FinderFree identification tools

WINDOW BALANCE FINDER · V0.1

Identify your window balance

Answer a few questions about the balance already in your window. We’ll narrow down the likely configuration, show which measurements matter, and tell you what still needs to be verified before ordering.

Start identifyingHow to measure first
  • Have the old balance nearby
  • No model number required
  • About 2–3 minutes

You’ll check:

Window channel balance measurement schematicAn old channel balance with a metal-length arrow, a width arrow, example stamp, and a separate bottom shoe depth arrow.25 3 JR CALDWELLlengthwidthshoe depth
  • Metal channel length
  • Channel width
  • Stamp / markings
  • Bottom shoe depth
Measure the metal channel only, then verify the shoe and fittings.

How it works

  1. 1

    Pick the balance type

    Start with the shape and style of the balance you removed from the window.

  2. 2

    Enter what you can see

    Record the metal length, width, stamp, shoe depth, and other visible details.

  3. 3

    Narrow down the likely family

    The Finder compares those details with the configurations currently supported.

  4. 4

    Verify before you buy

    Use the result to check the remaining measurements and fittings before ordering a replacement.

If the evidence is incomplete, the Finder gives you a review-focused result instead of guessing an exact replacement.

Helpful guides

S380 vs S385: how shoe depth changes the match

These two common configurations can look similar. Compare the bottom shoe depth and other details before choosing a replacement.

Compare S380 and S385 →

How to measure a channel balance

Learn which length to measure, where to find the stamp, and which dimensions matter before using the Finder.

See the measurement guide →

S351 vs S390: what to check

Compare the bottom shoe depth and fitting configuration when these two families are difficult to tell apart.

Compare S351 and S390 →

MEASUREMENT NOTE

Measure the metal channel only.
Do not include plastic fittings.

Lay the removed balance flat. Measure the exposed metal from end to end, then compare the plastic shoe separately.

Metal channel length measurementMETAL CHANNEL LENGTHmeasure this metal section only
Measure the metal channel only. Do not include plastic fittings.

BUILT FOR A CAREFUL MATCH

Useful guidance, not a blind part number.

V0.1 gives its most specific results for common nominal 1/2 in. non-tilt channel balances. Tilt, spiral, coil, box, and unknown balances are recognized, but still need a fuller visual and measurement comparison.

Always compare every fitting, metal length, and stamp or sash weight requirement before ordering. A stamp commonly indicates spring strength—not the entire replacement part.

Compare S380 and S385 shoe depth · How to measure a channel balance · What a stamp code can tell you · Compare S351 and S390 bottom shoes