4AM-CB20 (GM)

1.17 hp ( 0.87 kW )
Max Speed
150 rpm
Torque @ Max Speed
487 lb-in ( 55 Nm )
Max Air Consumption
71 cfm ( 120.0 m3/h )
Gear Ratio
20:1 :1
Speed @ Max Torque
15 rpm
Max Torque
740.0 lb-in ( 83.6 Nm )

Product Details

The compact 4AM-GB20 (GM) series offers variable operating speeds and power output that can be adjusted to meet the precise needs of your application. Their 20:1 gear reducer is not only ideal for lower speed and higher torque applications, but they also can be stalled or overloaded for long periods without damaging the motor. In addition to being a non-electrical device and cool running, Gast air motors are ideal for use in hazardous and extreme ambient temperature locations.

Gear Motors schematic

Available Models


Product Support

  • 4AM-70C-CB20 Product Specifications
    Data Sheet
    111KB | PDF
  • Air Motors/Gear Motors, Lubricated and Non-Lubricated
    6MB | PDF