Zero Backlash Gearheads

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Lifetime Series™
Zero Backlash Harmonic Gearheads



  1. Stressproof® Output Shaft - provides a minimum 115,000 psi tensile strength, resistance to fatigue and excellent wearability
  2. Output Flange - has a precision pilot and is available in metric, NEMA 17, 23, 34 & 42 sizes and can be factory modified to customer specifications
  3. Double Row Angular Contact Bearing - provides a precision output with high stiffness, high radial and axial load capacities
  4. Flexspline - a thin walled external spline that progressively engages with the Circular Spline with a zero backlash tooth mesh
  5. Wave Generator - precision elliptical ball bearing that turns with the input motor and causes the rotating elliptical wave form on the Flexspline
  6. Circular Spline - precision shaped internal spline, remains stationary and engages the Flexspline
  7. Quick Connection Motor Coupling - a socket head tightened clamping collar provides a reliable and simple motor connection
  8. Sealed Bearing - a precision bearing axially fixes the input shaft and wave generator positions
  9. Input Flange - factory machined to match your motor dimensions and available in standard NEMA 17, 23, 34 & 42 sizes
  • Lifetime zero backlash
  • Lifetime ultra-high repeatability (typically a few arc-sec)
  • Lifetime high positional accuracy (± 1.5 arc-min stanard)
  • Single stage, high reduction ratios of 50:1 to 160:1
  • Low noise and heat generation
  • High efficiency, torsional stiffness and torque-to-weight ratio
  • High torque capacity with a large number of teeth sharing load
LT1 GEARHEAD (NEMA 17 MOUNT)

LT1 GEARHEAD (METRIC STANDARD)
LT2 GEARHEAD (NEMA 23 MOUNT)

LT2 GEARHEAD (METRIC STANDARD)

LT3 GEARHEAD (NEMA 34 MOUNT)

LT3 GEARHEAD (METRIC STANDARD)
LT4 GEARHEAD (NEMA 42 MOUNT)

LT4 GEARHEAD (METRIC STANDARD)

Ratio 50 80 100
Nominal Output Torque Limits Nm 12 12 15
Maximum Output Torque Limit Nm 24 30 30
Nominal Input Speed rpm 3000
Maximum Input Speed rpm 7300
Max. Radial Load N 1268
Max. Axial Load N 1450
No-Load Starting Torque Ncm 5.4 3.3 3.0
No-Load Back Driving Torque Nm 2.3 2.6 2.7
Service Life hrs 25000
Torsional Stiffness Nm/arc-min 2.6
Repeatability arc-sec ±10
Positional Accuracy arc-sec ±90
Backlash arc-sec 0
Moment of Inertia kgcm² 0.047
Noise Level dB(A) 67
Protection Class - IP64
Permitted Operating Temp °C 90
Lubrication - Permanent
Weight kg .68
Ratio 50 80 100 120 160
Nominal Output Torque Limits Nm 25 25 30 30 30
Maximum Output Torque Limit Nm 50 60 60 60 60
Nominal Input Speed rpm 3000
Maximum Input Speed rpm 6500
Max. Radial Load N 2376
Max. Axial Load N 2595
No-Load Starting Torque Ncm 6.2 4.6 4.3 3.3 2.3
No-Load Back Driving Torque Nm 4 4.2 4.5 6.6 7
Service Life hrs 25000
Torsional Rigidity Nm/arc-min 4.5
Repeatability arc-sec ±10
Positional Accuracy arc-sec ±90
Backlash arc-sec 0
Moment of Inertia kgcm² .161
Noise Level dB(A) 67
Protection Class - IP64
Permitted Housing Temp °C 90
Permitted Ambient Temp °C 0 - 40
Lubrication - Permanent
Weight kg 1.2

Ratio 50 80 100 120 160
Nominal Output Torque Limits Nm 40 40 50 50 50
Maximum Output Torque Limit Nm 80 80 3100 100 100
Nominal Input Speed rpm 3000
Maximum Input Speed rpm 5600
Max. Radial Load N 3263
Max. Axial Load N 3717
No-Load Starting Torque Ncm 14 7 7 6 6
No-Load Back Driving Torque Nm 7 7.2 8.5 9 11.3
Service Life hrs 25000
Torsional Rigidity Nm/arc-min 24
Repeatability arc-sec ±10
Positional Accuracy arc-sec ±90
Backlash arc-sec 0
Moment of Inertia kgcm² .506
Noise Level dB(A) 67
Protection Class - IP64
Permitted Housing Temp °C 90
Permitted Ambient Temp °C 0 - 40
Lubrication - Permanent
Weight kg 2.6
Ratio 50 80 100 120 160
Nominal Output Torque Limits Nm 100 100 120 120 120 120
Maximum Output Torque Limit Nm 200 200 240 240 240 240
Nominal Input Speed rpm 3000
Maximum Input Speed rpm 4800
Max. Radial Load N 6012
Max. Axial Load N 6642
No-Load Starting Torque Ncm 38 18 16 14 12 11
No-Load Back Driving Torque Nm 11 14 15 20 21 22
Service Life hrs 25000
Torsional Rigidity Nm/arc-min 32
Repeatability arc-sec ±10
Positional Accuracy arc-sec ±90
Backlash arc-sec 0
Moment of Inertia kgcm² 2.12
Noise Level dB(A) 67
Protection Class - IP64
Permitted Housing Temp °C 90
Permitted Ambient Temp °C 0 - 40
Lubrication - Permanent
Weight kg 6.3