Series 77t

A traditional Block & Tackle Balance for tilt applications: Caldwell’s Series 77t balance is available in both with bobbin or stirrup options and Screw or Hook mounting options.
Series 77t succeeds AAMA Class 2 with a weight capacity of 2-45 lbs and length of 6-46 inches.

Product Features

  • Designed for all Tilt windows: residential or light commercial
  • Caldwell’s Music Wire Springs offer reliable and consistent operation
  • Positive lock, drop in system compensate for extrusion toleration and allow for tandem applications
  • Available in various colors and compatible with jamb covers

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Related products

  • Series77t Assembly Tools

    Tools to easily pull the the Series 77t bobbin or stirrup into the carrier.

  • Tilt Carriers

    Caldwell offers a wide range of Tilt Carriers with solutions for all pocket sizes.

  • APEX®

    An extended travel Block & Tackle Balance for sideload applications: Caldwell’s APEX® balance is available with multiple end guide configurations, for different jamb sizes.