WRS Amesbury Series 450 Block & Tackle Balances for Tilt Windows - 40" 3920 (15-20 lbs)
WRS Amesbury Series 450 Block & Tackle Balances for Tilt Windows - 40" 3920 (15-20 lbs)
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WRS Amesbury Series 450 Block & Tackle Balances for Tilt Windows - 40" 3920 (15-20 lbs)

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WRS Amesbury Series 450 Block & Tackle Balances for Tilt Windows - 40" 3920 (15-20 lbs)WRS Amesbury Series 450 Block Tackle Balances for Tilt Windows 40 3920 15 20 lbsWRS Amesbury Series 450 Block Tackle Balances for Tilt Windows 40 3950 32 38 lbsWRS Amesbury Series 450 Block Tackle Balances for Tilt Windows 40 3910 9 15 lbsWRS Amesbury Series 450 Block Tackle Balances for Tilt Windows 40 3930 20 25 lbs
Size:3920 15–20lbs
Actual Color:Silver

Key item features

  • TILT WINDOW COMPATIBILITY – Designed for tilt-style windows, the Amesbury Series 450 provides smooth, balanced lift and secure sash control with pre-assembled clip attachments for easy tilt-in cleaning and maintenance. Compatible with vinyl, aluminum, wood, and fiberglass tilt frames and fits standard 5/8″ channels. This product measures 13" in length, stamped 1210, and supports 3-8 lbs sash weights for reliable residential and commercial performance.
  • SMOOTH TILT FUNCTION & SECURE OPERATION: Built with precision pulley-and-spring mechanics and clip attachments pre-installed, the Series 450 allows safe, easy sash tilting for cleaning or maintenance. Its reinforced design prevents slamming, sticking, and sash drop, keeping operation stable and controlled at any angle.
  • AVAILABLE IN LENGTHS FROM 13″ TO 54″ (3–40 LB RANGE): The Series 450 family offers one of the widest length and weight ranges for tilt balances. Each unit is precision-tested to ensure accurate lift and smooth tilt operation. Arrives pre-assembled with clip attachments for fast, secure installation. Sold individually; hardware not included. Contact us if your balance length or travel differs.
  • DURABLE GALVANIZED STEEL CONSTRUCTION: Constructed from heavy-gauge galvanized steel, the Series 450 resists rust, corrosion, and daily wear. Precision-calibrated pulleys and springs maintain consistent lift through thousands of open-close cycles, delivering long-term reliability for tilt windows in homes, offices, and schools.
  • TRUSTED SINCE 1989 – WRS Window Repair Systems has over 30 years of experience supplying reliable, high-quality hardware. Trusted nationwide by homeowners, contractors, schools, and property managers for dependable repairs and long-lasting performance
Current price is $23.25
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