SD.616.20.00.B

SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series
  • SD.20.B SD.25.B Series

SD.616.20.00.B-SD.20.B SD.25.B Series

Toothless series slewing bearings are high-performance four-point contact ball rotary components tailored for light and medium-duty industrial machinery. Featuring a gear-free integrated structure, this series abandons traditional tooth transmission design, focusing entirely on smooth rotary motion, structural simplicity and versatile installation compatibility. With refined raceway optimization and standardized industrial manufacturing,  toothless bearings deliver stable load capacity and durable operation, serving as an economical and reliable solution for modern mechanical rotary systems.


Typical Applications:

Systems requiring silent or low-noise operation, where gear teeth might generate unwanted noise

Retrofit projects where an existing drive system must be reused

Light to medium-duty turntables and positioning stages

Solar trackers and antenna positioners where belt or friction drives are preferred


High load-carrying capacity
Resistance to high and low temperatures
Noise-free operation
Strictly controlled tolerances and appropriate internal clearance
Long service life and low maintenance requirements
Prevention of unexpected downtime (avoiding bearing fracture, seizure, and safety incidents caused by such failures, with anti-tilting capability)

Dimension and Parameters

SD.20.B SD.25.B Series
Type :SD.616.20.00.B
Brand :LYMC
Drawing No. :Drawing 1
Dimensions
Da [mm] :616
U [mm] :545,5
C [mm] :542,5
Di [mm] :472
Ha [mm] :
Hb [mm] :
H [mm] :
Fixing Holes
La [mm] :590
na [mm] :32
da [mm] :
Li [mm] :498
ni :32
di [mm] :
Weight
KG :37

Characteristics

✦ Four-point ball contact geometry – Single-row configuration with balls contacting the raceway at four points.

✦ Toothless ring surfaces – Both inner and outer rings have plain cylindrical faces without gear teeth.

✦ Induction-hardened raceways – Rolling paths hardened for wear resistance and extended fatigue life.

✦ Sealed raceway enclosure – Equipped with NBR rubber lip seals on both sides of the rolling chamber.

✦ Alloy steel ring material – Rings manufactured from high-strength alloy steel grades.

✦ Equispaced mounting holes – Both rings drilled with a uniform pattern of bolt holes for bolted attachment.


Features

✦ Flexible drive integration – Toothless rings allow custom drive selection, including pinions, belts, or friction wheels.

✦ Simplified system design – No gear teeth means one less precision component to specify and maintain.

✦ Cost-effective solution – Eliminating gear cutting reduces manufacturing cost compared to geared versions.

✦ Easier cleaning and maintenance – Smooth ring surfaces do not trap debris or contaminants.

✦ Reduced operating noise – No gear meshing ensures quieter machine operation.

✦ Lower rotational resistance – Friction-free toothless surface contributes to smooth, low-torque rotation.


Further Reading