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Harmonic Differential HDD
Size & Ratio Torque
500
RPM
Torque
1750
RPM
Torque
3500
RPM
Maximum
Output
Torque*
Maximum
Relative
RPM**
Weight
lbs.
(Approx.)
HDD 20
81:1 250 246 195 250 6000 7
101:1 300 246 195 300 6000 7
121:1 350 246 195 350 6000 7
161:1 375 246 195 390 6000 7
HDD 25
81:1 425 406 320 425 5000 14
101:1 600 406 320 600 5000 14
121:1 615 406 320 700 5000 14
161:1 615 406 320 780 5000 14
HDD 32
81:1 950 810 640 950 4500 25
101:1 1200 810 640 1200 4500 25
121:1 1230 810 640 1400 4500 25
161:1 1230 810 640 1550 4500 25
HDD 40
81:1 1700 1700 1350 1700 4000 32
101:1 2400 1700 1350 2400 4000 32
121:1 2580 1700 1350 2700 4000 32
161:1 2580 1700 1350 3100 4000 32
HDD 50
81:1 3100 3180 2525 3100 3500 65
101:1 4200 3180 2525 4200 3500 65
121:1 4825 3180 2525 5200 3500 65
161:1 4825 3180 2525 5800 3500 65
HDDX 50
81:1 5110 3890 3085 5110 3500 70
101:1 6500 4860 3855 6500 3500 70
121:1 7380 4860 3855 9500 3500 70
161:1 7380 4860 3855 13100 3500 70
HDDX 65
81:1 10200 7885 N/A 10200 3000 85
101:1 13680 9010 N/A 15300 3000 85
121:1 13680 9010 N/A 19300 3000 85
161:1 13680 9010 N/A 26600 3000 85

All torque ratings are in inch pounds.

Torque is rated at stated RPM of housing with Control Shaft stationary.

For housing speeds above 2,800 RPM the HDD may require dynamic balancing. If your application involves speeds above 2,800 RPM, please consult the factory when ordering.

* Repetitive momentary or continuous running load is not to exceed Maximum Output Torque Rating.

**Maximum relative RPM is speed of Control Shaft relative to Housing. Subtract the speeds if the inputs are in the same direction and sum the speeds if in the opposite direction.


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