Description
Product Overview
The WRS Caldwell Series 100 Spirex 5/8″ window balance is a precision‑engineered component designed specifically for non‑tilt residential windows. Constructed from a rugged steel spiral rod and a pencil‑style tube with a distinctive red tip, this balance provides consistent, smooth operation for window sashes. The 30″ length model offers a calibrated weight range of 7‑30 lb, making it suitable for a variety of window sizes and applications. With a compact profile of 0.62″ x 0.62″ and a total weight of just 7.2 oz, the balance integrates seamlessly into window frames without adding bulk. Its American‑style design reflects decades of industry experience, ensuring both durability and ease of use.
![[Product front view showing all components]](https://www.marketvia.store/wp-content/uploads/2026/08/20ec56371c114c279121d6a97219431d.jpg)
Usage
This balance excels in environments where reliable window operation is essential, such as single‑family homes, multi‑unit dwellings, schools, and commercial properties. It is ideal for windows that do not tilt, providing the necessary counterweight to keep sashes level and functional over years of daily use. Installers and DIY homeowners alike will appreciate the straightforward replacement process: simply measure the metal tube diameter, select the appropriate length, and fit the balance using common hand tools. The balance’s design eliminates the need for pivot locking shoes, streamlining installation and reducing the chance of errors.
Why Choose Us
Choosing the WRS Caldwell Series 100 means selecting a product backed by over 30 years of expertise in window repair systems. Our balances are manufactured in the United States, adhering to strict quality standards that guarantee long‑term performance. Each unit undergoes rigorous testing to ensure it meets calibrated weight specifications, providing confidence that your windows will operate smoothly for the life of the building. Additionally, WRS offers responsive customer support and a comprehensive warranty, reinforcing our commitment to customer satisfaction and product reliability.
Key Features
- Durable steel spiral rod delivers consistent counterweight for reliable sash support.
- Red‑tip pencil‑style tube provides easy visual identification and precise installation.
- Available in lengths from 10″ to 51″ to match a wide range of window openings.
- Calibrated weight capacity up to 30 lb ensures smooth operation for heavier sashes.
- WRS customer support and warranty give peace of mind for both professionals and DIY installers.
FAQ
What window types are compatible with this balance?
The Series 100 Spirex is designed for non‑tilt residential windows, but it also works with many 9/16″ systems. It is not suitable for tilt‑in windows that require a different balance geometry.
How do I determine the correct length for my window?
Measure the metal tube of the existing balance (excluding the tip and spiral). Compare that measurement to our length chart, which ranges from 10″ to 51″. Selecting the exact length ensures a proper fit and optimal performance.
Is installation tool‑intensive?
No. Installation requires only basic hand tools such as a screwdriver and pliers. The balance is a direct‑fit replacement, and the process can be completed in under 30 minutes for most windows.
Can I use this balance for commercial skylights?
Yes. The balance is ranked #8 in the Skylights & Roof Windows category, indicating its suitability for both residential skylights and commercial roof‑window applications.
What warranty does WRS provide?
WRS offers a limited warranty that covers manufacturing defects for a period of one year from the date of purchase. Our support team is available to assist with any installation or performance questions.





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