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as the gear units offer finely stepped torques and gear ratios for use in potentially explosive atmospheres.

Easy combination
because you can easily combine an explosion-proof helical gear unit with an explosion-proof motor from our modular system.

Explosion-proof parallel-shaft helical gear units
The classic: Versatility and performance, even in potentially explosive atmospheres

Our explosion-proof helical gear units have equipment group II approval for categorie 2. They drive systems and machines in potentially explosive atmospheres.

A total of six single-stage and 15 two and three-stage sizes cover a performance range of 50 Nm to 18,000 Nm. This gear unit series is also far ahead in terms of gear unit ratios: from i = 1.30 to i = 289.74, in double gear units even i = 27,001. Torque ratings and gear unit ratios this finely stepped are hard to find on the market.

The R gear units also meet demands for high output speeds and light weight, of course. With a consistently high level of efficiency, our explosion-proof helical gear units offer an optimum ratio between torque output and installation space.

Only half the solution without a motor? Then use our sophisticated modular concept and combine the explosion-proof gear units of the R series with the explosion-proof motor of your choice.

Contact form Worldwide locations Locations in Germany Worldwide directives and standards Surface and corrosion protection Adapters Extended Warranty Lubricants DUO diagnostic unit Learn more RX / R / RM series explosion-proof helical gear units
  • Highly efficient helical gear units in 6 frame sizes
  • High output speed, torque up to 830 Nm
  • Gear unit ratios up to i = 8.65
  • Available in foot or flange-mounted design
Sizes 57 / 67 / 77 / 87 / 97 / 107
Gear unit ratioi1.30 – 8.65
Max. output torque
Nm69 – 830
Motor power range (Mounting via AM motor adapter)kW0.12 – 45
  • Applications in potentially explosive atmospheres with air/gas or air/dust mixtures according to directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX)
  • Applications with equipment categories II2GD
  • Use with air mixtures
    • With gases (G): in zones 1 and 2
    • With dusts (D): in zones 21 and 22
  • Examples:
    • Roller conveyors
    • Belt conveyors
    • Chain conveyors
  • Explosion-proof helical gear units with extended output bearing hub
  • Specifically designed for agitating applications
  • Ten frame sizes
Sizes 57 / 67 / 77 / 87 / 97 / 107 / 127 / 137 / 147 / 167
Gear unit ratioi4.29 – 289.74
Gear unit ratio – double gear unitsi134 – 27,001
Max. output torqueNm450 – 18,000
Motor power range (Mounting via AM motor adapter)kW0.12 – 160
  • Applications in potentially explosive atmospheres with air/gas or air/dust mixtures according to Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX)
  • Applications with equipment categories II2GD
  • Use with air mixtures
    • With gases (G): in zones 1 and 2
    • With dusts (D): in zones 21 and 22
  • Examples:
    • Agitators
    • Blenders
    • Mixers
    • Kneaders
  • Fifteen frame sizes allow for an optimum ratio between performance and space requirements
  • Finely stepped gear unit ratios up to i = 289.74; or i = 27,001 for double gear units
  • Available in foot or flange-mounted design
  • Also available with reduced backlash
Sizes 07 / 17 / 27 / 37 / 47 / 57 / 67 / 77 / 87 / 97 / 107 / 127 / 137 / 147 / 167
Gear unit ratioi3.21 – 289.74
Gear unit ratio – double gear units
i90 – 27 001
Max. output torqueNm50 – 18,000*
Motor power range (Mounting via AM motor adapter)kW0.09 – 160

* Also with reduced backlash

  • Applications in potentially explosive atmospheres with air/gas or air/dust mixtures according to directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX)
  • Applications with equipment categories II2GD
  • Use with air mixtures:
    • With gases (G): in zones 1 and 2
    • With dusts (D): in zones 21 and 22
  • Examples:
    • Rotary tables
    • Pumps and fans
    • Waste water and sewage treatment plants
    • Fans
    • Roller conveyors
    • Belt conveyors
    • Chain conveyors
    • Corner transfer units