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Slew Rings

Slew Rings

Slew Rings

SlewMaster provides its customers with high quality slew rings within a wide range of sizes used in many applications. Sizes range from 3” (100mm) up to 6 ft (2m) in OD. For design and application purposes, slew rings are available with external teeth on the outer ring, internal teeth on the inner ring, or without teeth. Driving Pinions and Hydraulic Motors are available to mesh with appropriate slew rings upon request. Single row, and double row slew rings are available to accommodate different loading applications. For non-market standard rings, our team of engineers work alongside our customers to provide custom made slew rings as per required performance.

Technical Specifications
Four-Point contact bearing
Single row/double row
Material: C45/42CrMo4
Raceway diameter range: 3” (100mm) – 6ft (2m)
Standard/Custom mounting holes
Bearing raceway hardened to 50~54HRC
Standard/Custom grease zerk locations
High RPM

Benefits of Using Slewing Ring Bearings


Slewing ring bearings are designed to withstand heavy loads in the axial and radial directions as well high tilting moments. They can be found across multiple applications including renewable energy wind turbines, turntable bearings, and welding positioners, cranes, heavy-duty excavation and construction equipment and many more. A slewing is also the main component inside slewing drives, which utilizes the worm-wheel concept to generate torque for rotation and power transmission. Due to its versatility, a slewing bearing is considered the go-to solution across different slewing products. For installation, the most basic layout is using a slewing ring and pinion. Different gear orders and reduction rations can be achieved by changing the number of teeth and gear module between the pinion and the slewing ring. In cases where heavy-duty and high torques, are required gear teeth on both the slewing ring and the pinion undergo heat treatment through induction hardening creating a more durable mesh. Prolonging the service life and performance of a slewing bearing is a relatively simple process that only requires proper adherence to the installations & maintenance manual.

SlewMaster Slewing Ring Bearing Features.


There are various types and brands of bearings across the market covering a wide range of applications. The bearing raceway and number rolling elements defined its ability to withstand different types of loads. Slewing rings can be classified as ball or roller bearings. Ball bearings utilize steel spherical balls as their rolling elements coupled with plastic spacers for smooth rotation and minimum friction. A single row ball slewing ring is unique for its four-point contact of the rolling components with the bearing raceway. In other words, balls are in contact with the raceway at four defined points at any point in time. A double row ball slewing ring with the same design would have two rows of four point contact bearings creating eight points of contact between ball and raceway. On the other hand, roller bearings use cross-roller elements instead of spherical steel balls. Consequently, roller bearings generate a "line of contact" between rollers and bearing raceway as opposed to the four point contact generated by ball bearings. For heavy-duty applications, double row and heat-treated teeth are recommended for optimum performance, while light load applications can use thin section and flange design slewing rings. The service life is highly dependant on the wear and tear of its inner geometry. Therefore, it is important to have all loading information and design options available before selecting the appropriate bearing. In addition following proper handling and maintenance procedures must be followed to prolong the service life of the bearing.

Why Choose SlewMaster Slewing Ring Bearings?


SlewMaster provides its customers with high quality slewing bearings within a wide range of sizes used in many applications. Sizes range from 3” (100mm) up to 6 ft (2m) in OD. For various designs and application purposes, slewing bearings are available with external gears on the outer ring, internal gears on the inner ring, or without gears. Small single row thin section bearings all the way up to double row heavy-duty bearings are covered across SlewMaster's product range. Driving pinions and hydraulic motors are offered as complementary products to mesh with appropriate slewing rings upon request. Double row and single row ball bearing slewing rings are available to accommodate different loading applications.

SlewMaster's operations team follows through with customer forecasts and blanket orders to always guarantee that all custom products are available in a timely manner. For standard market slewing bearings, our team is able to provide drop fit models with reference to a bearing part number across different brands. For non-standard ring bearings, our engineering team is equipped with all the required bearing calculations and 3d modeling tools to provide custom made slewing ring bearings. Through collecting information about project scope, design considerations, and ring application, engineering solutions are implemented to be in compliance with customer requirements. 

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