Slewing Bearings





Miniature slew ring bearings are available in different configuration as shown above.

They are available with inner diameter starting from 37mm and up to 150.419mm and with outer diameter up to192.481mm.

The mounting bores have Ø 3.5mm through-hole, tapped hole or countersunk head bore are possible too.

Detailed dimension and load rating etc. available upon request.


Bearing size ranging from 150mm-6500mm diameter is available.



Find numerous applications

Stacker reclaimers, radar, gun turret, battle tank, rocket launcher, robots, wind mills, antenna, nuclear reactor, construction equipment, cranes, steel plant, cement plant, paper mills, Amusement parks, mining equipment, medical equipment, machine tools, water treatment plant, material handling equipment, foundry equipment, windmill tunnel, off-shore, aerial devices.

Bearing for special applications are available upon request please ask for a data sheet.

Detailed dimension, load rating etc. are available upon request.


As a result of their flexible capabilities, the rugged large diameter Slewing Bearings offered from mac are already operating in different applications and industry sectors. Harsh environment, significant high load cases, specific turning characteristics and high lifetime requirement needs suitable solutions. Our scope of supply in the field of large diameter Slewing Bearings contains Ball and Roller Slewing Bearings, with and without gear as well as customized solutions with integrated drives. No matter if you are interested in a new design or an urgently required spare part, with internal or external gears, even toothed belt or helical gears: with a diameter up to 240 inch (6100 mm) MAC offers a suitable drive solution for nearly every application.

Features and benefits of Slew-Ring Bearings offered by MAC:

  • Maximum outer diameter of 240 inch (6100 mm)

  • Internal and external gear up to module 30

  • Ground gears, toothed belt gears and other on request

  • Certified to meet EN 10204 requirements for materials, dimensions and operating specifications

  • Corrosion resistant version

  • Customized solutions

  • Rapid design of prototypes

  • Identical replacement parts for your ball and/or roller Slewing Bearings

  • Short delivery times



Ball Slew Ring Bearings single row/double row

  • Designed for average axial forces and tilting moments as well as high radial forces

  • Compared with the single-row version, the double row bearing can support higher loads at the same diameter

  • Applications: Mechanical engineering, construction equipment, wind turbines and ship loading/unloading applications

Double-Axial Ball Slew Ring Bearing

  • Simple and robust design with sufficient clearance

  • When tilting moments quickly change their amount and location

  • Where the slewing ring is subjected quick and continuous load changes

  • Applications: Open pit mining machinery like bucket-wheel excavators

Three-Row Roller Slew Ring Bearing

  • Used in highly demanding conditions
  • High static and dynamic load-carrying capacities
  • Applications: Rolling mill equipment, heavy-duty cranes and tunnel boring machines, mining machineries, etc,.

Cross-Roller Slew Ring Bearing

  • Used to support high radial forces as well as average axial forces and tilting moment loads
  • Zero clearance and uniform bearing friction
  • Applications: Mechanical and plant engineering, medical device and antenna equipment

Combi Slew Ring Bearing

  • Used in conditions of high axial forces and relatively low tilting moment loads
  • Applications: Bulk handling and conveyance equipment