Torque Range

Helical Bevel Heavy Duty Gear Units

When high output torque, robustness reliability and long operating life must be achieved, Bonfiglioli's HDx Series represent the best solution for our custmers needs. Thanks to high quality materials and an optimized design, HD Series can operate in the harshest environemt, as well as in explosive atmospheres, with low maintenance costs and long time service intervals. The output shaft can be chosen both in the parallel (HDP) or right angle(HDO) configuration and to always ensure the minimization of mounting space. HDx Series, furthermore, can be deeply customized thanks to an extremely wide options and accessories portfolio, thus matching most of the requirements of a large applications number.


Key benefits

  • Highly transmissible power
  • Robustness
  • Mounting flexibility
  • Reliability
  • Usable in explosive environments


Main options

  • Fan cooling, cooling coil, oil heater
  • External cooling unit
  • Backstop
  • Forced lubrication
  • Temperature and oil level sensors
  • Drywell
  • Taconite seals
  • ATEX certification for explosive 
  • environments


Torque range

8,990 ... 209,900 Nm


Gear ratios

5.6 ... 490



  • Single/double-sided solid input shaft (metric or inch dims)
  • Keyed hollow shaft
  • Shrink disc



Input with solid shaft
Input with e-motor coupling:

  • BN, BE, BX [IEC asynchronous]
  • BSR [IEC reluctance]


Motor options

  • Thermistors and thermostat sensors
  • Independent forced cooling
  • Incremental, sin/cos absolute single/multi-turn encoders
  • Tropicalization
  • Anti-condensation heaters



Spheroidal cast iron housing

I/O shaft planarity and gearbox symmetry

Wide range of options and accessories

High design standards

Atex - gearbox for explosive environments 2G/2D

Type File Size
Brochure   Heavy Industry Solutions   564.19 Kb   View   Download
Brochure   GR Bonfiglioli Offerings   688.85 Kb   View   Download
Data Sheet   HDO Series   70.26 Kb   View   Download
Catalogue   HDO-HDP Series   25.73 Mb   View   Download

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