4AM-GR25 (GM)

1.25 hp ( 0.9 kW )
Max Speed
200 rpm
Torque @ Max Speed
400 lb-in ( 45.2 Nm )
Max Air Consumption
60 cfm ( 102.0 m3/h )
Gear Ratio
15:1 :1
Speed @ Max Torque
20 rpm
Max Torque
640.0 lb-in ( 72.0 Nm )

Product Details

The compact 4AM-GR25 (GM) series offers variable operating speeds and power output that can be adjusted to meet the precise needs of your application. Their 15:1 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-RV-75-GR25 Product Specifications
    Data Sheet
    116KB | PDF
  • Air Motors/Gear Motors, Lubricated and Non-Lubricated
    6MB | PDF