Restore Smooth, Reliable Window Performance with the WRS Caldwell Series 320 Apex Extended Travel Block & Tackle Balance


Bring your non-tilt, side-load windows back to life with the Caldwell Series 320, engineered for precision, strength, and long-lasting performance. Ideal for both replacements and new installations, this balance system ensures smooth, controlled sash movement with professional-grade durability.


The precision spring-and-pulley design prevents slamming or sudden drops, keeping operation steady and safe at any height. When closed, it seals tightly to boost energy efficiency, reduce drafts, and maintain comfort in residential, educational, and commercial spaces.


Built from high-strength galvanized steel, the Series 320 resists corrosion and delivers dependable performance through years of use. Each balance comes pre-assembled with top and bottom guides for fast, easy installation—perfect for both pros and DIYers.


Key Features:



  • Available lengths: 8″–60″

  • Supports sash weights: 2–53 lbs

  • Extended-travel design for smoother operation

  • 5/8" channel depth for standard side-load windows

  • Replace both balances for even performance


Selection Guide:



  1. Measure only the metal channel (exclude plastic ends).

  2. Verify 5/8" channel depth.

  3. Match stamped number to sash weight (e.g., “07-1” = 8" / 2–2.99 lbs).

  4. Note: Balance length = stamped number + 1".


Additional Info:



  • Balances 20" or longer may require special handling.

  • Accessories and hardware sold separately.


Trusted for over 30 years, WRS Window Repair Systems provides precision-engineered hardware built to keep windows operating safely, smoothly, and efficiently for years to come.
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WRS Series 320 14" Extended Travel Apex Block & Tackle Balance | 13-2 (5-7.99 lb

9.24

Restore Smooth, Reliable Window Performance with the WRS Caldwell Series 320 Apex Extended Travel Block & Tackle Balance

Bring your non-tilt, side-load windows back to life with the Caldwell Series 320, engineered for precision, strength, and long-lasting performance. Ideal for both replacements and new installations, this balance system ensures smooth, controlled sash movement with professional-grade durability.

The precision spring-and-pulley design prevents slamming or sudden drops, keeping operation steady and safe at any height. When closed, it seals tightly to boost energy efficiency, reduce drafts, and maintain comfort in residential, educational, and commercial spaces.

Built from high-strength galvanized steel, the Series 320 resists corrosion and delivers dependable performance through years of use. Each balance comes pre-assembled with top and bottom guides for fast, easy installation—perfect for both pros and DIYers.

Key Features:

  • Available lengths: 8″–60″
  • Supports sash weights: 2–53 lbs
  • Extended-travel design for smoother operation
  • 5/8" channel depth for standard side-load windows
  • Replace both balances for even performance

Selection Guide:

  1. Measure only the metal channel (exclude plastic ends).
  2. Verify 5/8" channel depth.
  3. Match stamped number to sash weight (e.g., “07-1” = 8" / 2–2.99 lbs).
  4. Note: Balance length = stamped number + 1".

Additional Info:

  • Balances 20" or longer may require special handling.
  • Accessories and hardware sold separately.

Trusted for over 30 years, WRS Window Repair Systems provides precision-engineered hardware built to keep windows operating safely, smoothly, and efficiently for years to come.

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