SGF Series Parallel Shaft Helical Gearmotors


The Superior Gearbox SGF Series parallel shaft helical gearmotor is the ideal drive for tight spaces. This compact drive, with its multiple mounting configurations and shaft designs, is a rugged alternative to right-angle gearmotors.  Units are available as shaft output or as hollow bore / shaft mount designs.


Product Range

  • Power ratings from 0.05 to 336 HP
  • Ratios from 3.77 to 29,211
  • Output torques to 159,300 lb-in



  • Efficiency = 97% (2-stage) or 95.5% (3-stage)
  • Gears manufactured from certified steel, heat treated to a case hardness of 58-62 Rockwell
  • Finished ground or shaved gear teeth to assure minimum noise, minimum heat, and maximum mechanical efficiency (approximately 1.5% loss/stage)
  • Anti-friction bearings for optimum load capacity and long life
  • Captured keys on input and output shafts
  • SGF37-SGF157 gear housing contains high strength cast iron, SAE Class 30 or equivalent (GG20)
  • SGF27 housing contains high strength pressure-cast aluminum
  • O-ring on flange to prevent oil leakage when mounted on a surface that is not totally flat
  • High cross-section modulus design, rugged monobloc design for maximum rigidity
  • Center tapped holes on output shafts to aid the installation of shaft components
  • Metric or Inch dimension output shafts
  • Removable inspection cover


  • Inverter duty
  • Connection terminals
  • Low rotor inertia for high cycling and tight control
  • EISA (IE3) “Premium” available
  • 50Hz, 60Hz, or 50/60Hz global motor for shipment into Europe


  • Built-in torque arm for shaft mounting
  • B14 or B5 flange with centering tenon
  • Tapped rail holes for foot mounting
  • Can be ordered for any mounting orientation

Optional Features

  • C-Face or IEC motor adapter
  • Hollow shaft
  • Heavy duty taper roller bearings (67-127)
  • FKM seals instead of NBR
  • Corrosion and/or long term storage protection
  • High cycling fail-safe brake
  • Forced cooling fan for low frequency operation
  • Thermostat or thermistor protection
  • Plug connectors for quick motor replacement
  • Two-speed motor
  • Motor encoder – built-in or externally mounted

Contact us at Superior Gearbox for sizing/ratings/drawings for our parallel shaft helical gearmotors.