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Motion Control
Product Series
Product families
Basic Types
TYPESDamping torque in-lbsDamping direction
FDN-47-L17.70 +/- 2.66left
FDN-57-L48.68 +/- 2.66left
FDN-63-L75.23 +/- 7.08left
FDN-70-L97.36 +/- 8.85left

Rotary Dampers
FDN-L

The flat disc brake for one direction of rotation

Continuous Rotation
Damping torque 2.66 in-lbs to 97.36 in-lbs

The damping direction of the flat, strong FDN rotary dampers with steel body can be either right or left rotation. They can brake directly in the pivot point. ACE rotary dampers are maintenance-free and ready-to-install.

Rotary damper products are built to metric specifications. For precise measurements, please refer to the ACE rotary damper catalog or contact an application expert.
Rotary Dampers
FDN-L
The flat disc brake for one direction of rotation
Continuous Rotation
Damping torque 2.66 in-lbs to 97.36 in-lbs
ACE Controls Inc. - Image - FDN-L
ACE Controls Inc. © 2023
ACE Controls Inc. - Image - FDN-L

Technical Data

Damping torque 2.66 in-lbs to 97.36 in-lbs

Damping direction left

Construction size Ø 1.85 in to 2.76 in

Rotational speed max. 50 rpm

Lifetime 50,000 cycles (1 cycle = 360° left-hand, 360° right-hand). Even after this time, the dampers still produce over approx. 80 % of their original damping moment. The service life may be significantly higher or lower, depending on the application.

Operating temperature range 14 °F to 140 °F

Material Outer body: Steel; Output shaft sleeve: nylon with metal freewheel

Mounting In any position

Information to the shaft FDN-47: Ø 0.24 +0 / -0.001
FDN-57 to FDN-70: Ø 0.39 +0 / -0.001
Hardness > HRC55, surface smoothness RZ < 1µm

Mounting information

Turn the shaft in the opposite direction to the brake direction to avoid damaging the freewheel mount. No axial or radial forces may be induced via the shaft.

Safety information

Do not use rotary dampers as supports. Provide an external guide or support.

On request

Special accessories available on request.

    Application Examples

    FDN Cooker hood protection
    Rotary Dampers - FDN
    Protection systems for motor-driven cooker hoods
    For ergonomic handling, modern cooker hoods can be driven by a motor into an up position and then down again. When driven downwards, an AC load can result in a total loss through current being fed back into the voltage source. One of the tasks of...
    FDN Cooker hood protection

    Application Areas

    • Handling modules
    • Linear slides
    • Automatic machinery
    • Conveyor equipment
    • Absorption control
    Precision hydraulic feed controls of the product family VC are used in automotive and industrial applications as well as in mechanical engineering and the electronics industry.
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