M Series

Metso’s Jamesbury® M series manual gear actuator is a hand wheel operated worm gear actuator with high efficiency for greater output torque. Can be more convenient and require less space than lever handles.

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  • Cast iron body with metal gears and bearings
  • ISO 5211 mounting pattern
  • Fully enclosed and weather-proof
  • Factory lubricated for their lifetime
  • Wide range of sizes and torque outputs
  • Many available options including locking, high temperature, and marine and buried service
  • Adjustable stops for both open and closed positions
  • Highly visible position indication pointer


  • Long life
  • Low maintenance
  • Easy to operate
  • Proven performance


  • Output torque range:     125 – 24100 Nm (92 – 17770 lb-ft)
  • Standard temperature range:     -40 °C to +80 °C (-40 °F to +176 °F)
  • Options :     Available with female square or key drives
  • Provided with pre-sized hand wheel with shear pin to prevent damage from excessive input torque
  • Optional constructions available for special conditions