Discover IMO Slew Drives and Slewing Rings

We are excited to announce that Neilson Hydraulics and our sister company VHS Hydraulic Components have been appointed the official UK distributor for IMO that provides a wide range of slew drives and slewing rings, which can be used in a variety of applications.


IMO Slew Rings and Slew Drives


IMO is a specialist in turning and slewing solutions. Since 1988, IMO has been developing and producing IMO slewing rings and slew drives for the most varied of application areas. The company has two production locations in Gremsdorf in the Nuremberg metropolitan region in Germany.

For more than 30 years, IMO antifriction bearing solutions have been impressing customers throughout the world with their excellent technology, high quality, and the customer proximity of the company. However, the slewing ring specialist focuses on custom bearing solutions. In close collaboration with the customer, we develop tailored slew drives and slewing rings in order to fully exploit the potential of the applications at hand.


What is a slew drive?

A Slew Drive is a ready-to-install unit consisting of a ball or roller slewing ring for the simultaneous transfer of axial and radial forces as well as tilting moments with hydraulic or electric drives in a completely enclosed housing.

  • Spur gear unit or worm drive
  • torques of up to 450 kNm
  • tilting moment load of up to 1,200 kNm
  • Raceway diameter of up to approx. 1,000 mm
  • Unlimited slewing range
  • Fast installation
  • Smooth, jolt-free movement – no stick/slip effect
  • Maximum safety through full encapsulation
  • Cost-efficient, proven technology
  • Compact, space-saving, heavy duty


For Slew Drives, some attachments such as the brake, planetary gear, motor, and rotary encoder can be delivered on request.


Standard product or individual solution?

IMO Slew Drives are available as a large selection of standard series. If none of IMO’s standard solutions are suitable for your application, our application engineers can work with you to develop a custom slew drive. Versions for continuous operation and extreme temperatures are possible, as are special materials. The mounting structure, such as valve blocks, hydraulic connections, adapter plates, and sensors can also be taken into account in the design.


IMO Slew Drives can be used in a variety of applications

IMO Slew Drives are designed for a long lifetime with low maintenance efforts. They require a small amount of installation space but can take top loads. That is why they are the top slewing solution for a lot of applications. IMO Slew Drives are used in forestry, agriculture, mining, manlift platforms, numerous maritime applications, and machine construction and plant engineering.




The IMO Slew Drive WD Series features:

  • High rotational speed
  • High gear ratio
  • Rotational speed 1-3 rpm


IMO Slew Drive WD-L features:

  • Raceway diameter 156 mm to 713 mm
  • Maximum tilting moment 9 kNm to 1,095 kNm

IMO Slew Drive WD-L










IMO Slew Drive WD-H features:

  • Raceway diameter 280 mm to 725 mm
  • Maximum tilting moment 94 kNm to 1,052 kNm

IMO Slew Drive WD-H












The IMO Slew Drive SP Series features:

  • Higher rotational speeds
  • Higher duty


IMO Slew Drive SP-I features:

  • Raceway diameter 229 mm to 1091 mm
  • Maximum tilting moment 22 kNm to 353 kNm

IMO Slew Drive SP-I










IMO Slew Drive SP-H features:

  • Raceway diameter 455 mm to 955 mm
  • Maximum tilting moment 153 kNm to 562 kNm

IMO Slew Drive SP-H













What is a Slewing Ring?

Slewing Rings are large diameter antifriction bearings for the simultaneous transmission of axial and radial forces as well as tilting moments. They replace traditional solutions with fixed and floating bearings as well as king pin bearings. Frequently, this results in bearings with axial/radial bearing combinations with one bearing point. This can significantly simplify the design of the mounting structure and the installation of the bearings, which in turn reduces effort and costs.

Cost-effective and tried-and-tested, IMO antifriction bearings are available as:

  • Ball slewing rings, roller slewing rings, and ball-roller combination slewing rings
  • Four-point bearings, double four-point bearings/eight-point bearings, flange bearings, wire race bearings, cross roller bearings
  • Segmented slewing rings
  • Gear rims
  • External gearing, internal gearing, or without gearing
  • Diameter ranging from 100 mm to 6000 mm
  • With cages (steel, brass, or plastic) or spacers (brass or plastic)
  • With standard seals or specially produced special seals
  • Optionally with induction-hardened raceways
  • Different corrosion protection coatings possible


IMO Slewing Rings have mounting holes and a sealed raceway system with grease lubrication. They can be combined with motors, pinions, and planetary gears. Functions and parts of the mounting structure – such as attached bearing rings – can be integrated.


IMO Slewing Rings can be used in a variety of applications

IMO Slewing Rings are used in numerous applications as machine elements that can simultaneously transmit axial and radial forces, as well as tilting moments. The application spectrum ranges from large triple-row roller slewing rings for tunnel construction to small ball slewing rings for medical technology. However, IMO slewing rings are used in the bottling and filling industry, opencast mining, bulk handling, and transport engineering. In the field of renewable energies, IMO blade bearings, yaw bearings, and main bearings are used in wind turbines or as rotor blade bearings in tidal stream systems. Below, you can find out about product details for your application.




The IMO Ball Slewing Rings feature:

  • Single or double row
  • Four-point raceway geometry
  • Enables robust constructions for harsh operating conditions

IMO Ball Slewing Rings














Ball diameter
12 to 80 mm



The IMO Roller Slewing Rings feature:

  • Single-row, double-row, or triple-row
  • Top load with really small installation space
  • Top requirements for even load distribution.

IMO Roller Slewing Ring














Roller diameter
10 to 100 mm



The IMO Ball-Roller Combination Slewing Rings feature:

  • Combination of roller and ball slewing rings
  • Used for dominant axial force and low radial loads/tilting moments

IMO Ball Roller Combination Slewing Ring














Ball diameter
25 to 80 mm
Roller diameter
to 100 mm





Enquire about IMO Slew Drives and Slewing Rings at Neilson Hydraulics

Neilson Hydraulics is an IMO UK distributor. Neilson Hydraulics supplies IMO Slew Drives, including IMO Slew Drives WD Series (WD-L & WD-H) and IMO Slew Drives SP Series (SP-I & SP-H), as well as IMO Slewing Rings, including IMO Ball Slewing Rings, IMO Roller Slewing Rings and IMO Ball-roller Combination Slewing Rings.


To enquire about IMO Slew Drives and IMO Slewing Rings, please contact Neilson Hydraulics on: 01709 821 002 / E: or visit our website at:

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