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Precise braking without oil

Continuous Rotation
Damping torque 0.88 in-lbs

In comparison to other rotary dampers, the ACE FFD product family does not need any fluid to generate the damping torque, but rather works on the principle of friction. That means temperature or speed changes have virtually no influence on the damping torque. The FFD is available in two different body variants and two types of bearings. ACE rotary dampers are maintenance-free and ready-to-install.

CAD Drawings


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Continuous Rotation


A1.10 inch
B0.31 inch
C0.51 inch
D0.12 inch
E1.65 inch
F1.42 inch
G0.94 inch
H0.32 inch
I0.63 inch
J0.15 inch

Technical Data

Execution Flange assembly, one-sided bearing

Damping torque 0.88 in-lbs

Damping direction right

Construction size Ø 0.98 in to 1.18 in

Rotational speed max. 30 rpm

Lifetime 30,000 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

Mounting In any position

Information to the shaft Ø +0 / -0.03
Hardness > HRC55, surface smoothness RZ < 1µm inch


Rotary damper products are built to metric specfiications. For precise measurements, please refer to the ACE rotary damper catalog or contact an application expert.

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 designs available on request.

General information

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