Window balance decision guide

Channel balance replacement and block-and-tackle identification

Channel balances are often described with block-and-tackle terminology. This page keeps that terminology together because the replacement decision still depends on the same physical balance and its attachments.

Five-step channel balance measurement diagram showing metal channel length, channel width, channel depth, stamp or marking, and end fittings. — **How to measure a channel balance**Measure the metal channel itself for length and record width, depth, markings and end-fitting context. Do not treat a stamp alone as an exact product match.

Identification and fit check

First identify the hardware family, then collect the measurements that affect fit. A likely family is not the same as a confirmed replacement.

JavaScript is off. Use the static guidance below to identify the hardware family and record measurements. No computed fit result is available without the selector. Use the static measurement guidance on this page instead.

Opening and visible hardwareOpening typeOperation typeVisible hardware formTilt stateObserved stamp or marking (optional)

Channel measurementsChannel length

Enter the observed value. No tolerance is assumed.Channel width

Enter the observed value. No tolerance is assumed.Channel depth

Enter the observed value. No tolerance is assumed.Bottom guide / terminalPivot relationship

Spiral measurements and safetyTube length

Enter the observed value. No tolerance is assumed.Rod length (when applicable)

Enter the observed value. No tolerance is assumed.Tube diameter

Enter the observed value. No tolerance is assumed.Rod / end configurationTip / bushing / bearing colorHandling safety status

Pivot shoe / pivot hardware measurementsPivot shoe width

Enter the observed value. No tolerance is assumed.Pivot shoe thickness

Enter the observed value. No tolerance is assumed.Pivot shoe profileCam / slot descriptorMating balance system

Confirm the family before matching a part

A rigid metal channel supports a channel-balance classification, but the channel alone does not establish exact fit. The end/terminal hardware and window configuration matter too.

Channel balance measurement checklist

Record the metal channel length and unit.
Record channel width and depth.
Copy the observed stamp or marking exactly; do not silently convert it into a SKU.
Record tilt or non-tilt state.
Describe the top/bottom guide or terminal and any pivot relationship that affects installation.

Do not assume a dimensional tolerance unless a rights-cleared technical rule explicitly supports it.

Before you shop

If the family is supported but fit-critical details are incomplete, the safe commercial state is category-level browsing only. Exact compatibility should remain unconfirmed until the required measurements and attachment relationships agree.

Not sure it is a channel balance?

Return to the identification guide and re-check the visible hardware form.