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Replacement Window Coil Springs | Constant Force Balance Springs for Sash Windows | AmesburyTruth Parts

Constant force balance coil springs keep sliding sash windows operating smoothly and safely by counterbalancing the sash weight with reliable, steady tension. These stainless steel coil springs act as the main component in constant force window balance systems, helping prevent windows from slamming shut or becoming difficult to open. Find the right window balance spring for your repair or upgrade needs from trusted AmesburyTruth parts.
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Constant force coil springs are essential hardware in modern window balance systems, providing the steady, reliable tension needed to counterbalance sash windows of all sizes. By delivering a consistent force as they extend and retract, these springs allow for effortless window operation, ensuring that the sash stays in place at any position without drifting or slamming.

How Constant Force Balance Springs Work

Unlike traditional spiral or block-and-tackle balances, constant force window balance springs use a tightly wound stainless steel coil. As the window is raised or lowered, the spring unwinds or rewinds, applying a nearly uniform counterweight throughout the sash's motion. This design offers several benefits: smoother movement, less wear on window components, and reliable long-term performance.

Common Applications and Compatible Windows

These springs are widely used in double-hung and single-hung sash windows, especially in vinyl, aluminum, or wood window systems. AmesburyTruth constant force balances are a popular choice among North American window manufacturers and are commonly found in many leading window brands. If your windows open vertically and use a coil spring mechanism instead of ropes or spiral rods, these parts are likely what you need for replacement or repair.

  • Made from corrosion-resistant stainless steel for longevity
  • Designed to fit 1/2 inch wide balance channels (check your window's balance width)
  • Available in various tension ratings (e.g., #3, #6, #7, #8) to match sash weights
  • Direct replacements for original AmesburyTruth window balances

Replacement Tips and Installation

When replacing constant force coil springs, always match the spring's width, length, and tension rating to the original part,these values ensure proper window balance and safety. Most installations simply require removing the sash, accessing the balance channel, and swapping out the old spring for the new one. It's recommended to replace both springs in a window at the same time for even operation.

Products like the D #6 Pound coil spring or F #8 Pound spring are ideal for replacing worn or broken window balances. For lighter windows, the A #3 pound option provides just the right tension, while DL #6 pound springs serve as a reliable replacement for mid-weight sashes.

Why Choose Genuine AmesburyTruth Parts?

TruthParts is an authorized reseller of AmesburyTruth products, ensuring every constant force coil spring you buy is factory-original and built to last. Using manufacturer-certified parts protects your window's warranty and guarantees the correct fit and function for your specific brand or model.

Frequently Asked Questions

  • How do I know which coil spring my window needs? Check your existing spring for markings that indicate width and tension rating (like #6 or #7), or consult your window's documentation. If in doubt, contact us with your window details.
  • Can I replace just one spring? It's best to replace both springs in a sash at the same time to ensure balanced operation and prevent uneven wear.
  • Are these coil springs universal across brands? While many constant force springs are similar, always verify compatibility with your window manufacturer or by matching the original part number and specs.
  • What tools are needed for replacement? Basic hand tools (like a screwdriver) are often sufficient. Gloves are recommended to handle the spring safely.

Restore smooth, safe window operation with reliable constant force window balance springs, engineered for longevity and trusted by professionals across the industry.