Explosion-proof helical-bevel gear units

Our ATEX-compliant K series right-angle gear units combine high cost-effectiveness with explosion protection thanks to their wear-free gearing and high efficiency.

Save energy the easy way: even in potentially explosive atmospheres

K series explosion-proof helical-bevel gear units
The figure shows an explosion-proof helical-bevel gearmotor
The figure shows an explosion-proof helical-bevel gearmotor

You want a drive solution that can be installed in a small space? One that provides reliable motion in potentially explosive atmospheres?

Then we recommend our explosion-proof helical-bevel gear units in equipment categorie II2GD. These right-angle gear units have torques from 200 Nm to 50,000 Nm and feature a particularly compact design.

With their high efficiency in both directions of torque and at any input speed, they are also very energy-efficient. Their high-endurance gearing is wear-free and lasts a gear unit’s lifetime. For precise positioning tasks, you can use the K series explosion-proof gear units with reduced backlash.

A long, maintenance-free service life enhances this economy and efficiency. That’s why the K series is used in so many applications in potentially explosive atmospheres. Worldwide!

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

Configure your individual product

  • Detailed information about your individual product
  • CAD data and documentation for your configuration
  • Option to directly request a quotation or place an order
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Your benefits

  • More energy efficiency

    due to the high efficiency degree in both directions of torque and at any input speed.
  • More cost efficiency

    over the entire service life due to wear-free gearing and a long, maintenance-free operating life.
  • High performance

    in a compact design, available in 12 sizes with torque ratings from 200 Nm to 50,000 Nm.


Sizes K..37 to K..187, explosion-proof (three stages)

  • Gear units comply with Directive 94/9/EC (ATEX), or as of April 20, 2016 of the EU Directive 2014/34/EU (ATEX), equipment group II, categorie 2, variant II2GD
    • For use on the European market
    • Accepted in China
    • Accepted in Russia in combination with EAC certificates (formerly GOST-R)
  • Certified protection types:
    • Protection type “c”: Protected by safe construction (design safety), EN13463-1 and -5
    • Protection type “k”: Protected by liquid immersion, EN13463-1 and -8
  • Standardized robust covers as shrink disk covers on the gear unit
  • All screws are secured against automatic loosening
  • Gear unit has a separate nameplate
  • High-quality oil seals
  • Lubricant can withstand high temperatures
  • High efficiency
  • Gearing with high fatigue strength
  • Long, maintenance-free operating life
  • Available variants:
    • Foot- or flange-mounted
    • B5 or B14 flange-mounted
    • Solid or hollow shaft
    • Hollow shaft with keyed connection, shrink disk, splined hollow shaft, or TorqLOC ®
    • Double gear units for very low output speeds also available
    • Reduced backlash variant

Technical data

K series (three stages) / sizes 37 / 47 / 57 / 67 / 77 / 87 / 97 / 107 / 127 / 157 / 167 / 187

Close table
Gear unit ratio i 3.98 – 197.37
Gear unit ratio – double gear units i 94 – 32,625
Max. output torque Nm 200 – 50,000
Motor power range (Mounting via AM motor adapter) kW 0.12 – 200
We have stored a table for you here.

Areas of application

  • 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:
    • Pallet conveyors
    • Belt conveyors
    • Chain conveyors
    • Hoists and lifting stations
    • Freight elevators
    • Travel and lifting drives in stacker cranes

Accessories and options


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