AIST-Compliant Caliper Disc Brake replaces 16 in. drum brakes.

Press Release Summary:



Designed to directly replace 16 in. drum brake in crane applications, spring-applied and electrically released 21 in. CDB1621A operates in series with DC motors and requires no modification if installation conforms to AIST dimensional standard for DC mill motors. Use results in facilitated and minimized wear adjustment as well as elimination of drag and slip problems due to drum thermal expansion. Solution also offers resistance to heat checking.



Original Press Release:



PT Tech's New CDB1621A Replaces Existing 16" Drum Brakes and Conforms to the New AIST Brake Standard



  • Spring applied
  • Electrically released
  • Operates in series with DC motors
  • Installation requires no modification

    If the installation conforms to AIST's dimensional standard for DC mill motors, then when ordering all that is required is the DC mill motor number and existing electrical coil specifications. In all other installations, please provide a drawing of the existing brake drum.

  • 21" inch disc replaces a 16" drum

    The CDB1621A caliper disc brake provides higher performance and easier maintenance than the drum brakes it replaces. Upgrading your crane with PT Tech's CDB1621A will result in the following advantages.

    1) Wear adjustment is far easier.
    2) Less frequent need for wear adjustments.
    3) Improved wear life.
    4) Replacing friction pucks is substantially quicker.
    5) A set of friction pucks weighs only 4½ pounds.
    6) Eliminates drag and slip problems due to drum thermal expansion.
    7) Significantly better resistance to heat checking

    PT Tech supports its commitment to excellent field service with a large inventory of parts and a 24-hour emergency service.

    When Converting
    The CDB1621A directly replaces an 16" drum brake. It has the same mounting footprint and torque capacity as an 16" drum brake. When converting, it is critical that the disc's centerline is in the same position as the drum's centerline.

    Single-acting caliper disc brakes impose a bending moment. Shafting should be reviewed prior to installation. Consult PT Tech.

    In most cases, PT Tech can suggest mounting adaptations for non-standard drum brakes. Consult PT Tech.

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