VA250720N 

VA.VSA Series slewing ring bearing
  • VA.VSA Series slewing ring bearing
  • VA.VSA Series slewing ring bearing

VA250720N -VA.VSA Series slewing ring bearing

The VA and VSA series are single-row, four-point contact ball slewing bearings featuring an external gear on the outer ring. These series are precision-engineered for applications that demand higher rotational accuracy, greater rigidity, and smoother operation compared to standard industrial slewing bearings.


Typical Applications:

Radar and antenna positioning systems

Precision rotary tables and indexing equipment

Medical equipment (e.g., CT scanners, radiotherapy devices)

Solar tracking systems requiring high pointing accuracy

Robotics and automation equipment



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

VA.VSA Series slewing ring bearing
Type :VA250720N 
Brand :LYMC
Boundary Dimension
Da[mm] :844.1
di[mm] :630
H[mm] :59
Mounting Dimension
La[mm] :780
Li :662
n1 :30
n2 :30
φ1 :18
φ2 :18
Structure Size
b :52
h :7
B :52
C :52
Di :719
da :721
Gear Information
m :6
z :139
do :834
Rated Axial Static Load :1600
Weight [KGS] :69

Characteristics

✦ Four-point contact ball design – Single-row configuration handles axial, radial, and tilting moment loads in one raceway.

✦ External gear on outer ring – Teeth cut on the outer ring allow direct pinion engagement for rotary drive and positioning.

✦ Ready-to-mount – Both rings come with pre-drilled mounting holes (threaded or through) for bolted installation.

✦ Standardized clearances – Radial clearance 0 to 0.05 mm, axial tilting clearance 0 to 0.08 mm across the series.

✦ Induction-hardened teeth – Gear teeth are heat-treated for wear resistance and bending strength.

✦ Compact cross-section – Uniform 56 mm section height throughout the series, with ring widths at 44.5 mm.

✦ Broad size range – Bore diameters from 342 mm to 1,024 mm, covering medium to large rotary applications.


Features

✦ External gear on outer ring – Direct pinion engagement for rotary motion.

✦ Four-point ball contact – Handles axial, radial, and moment loads together.

✦ Ready-to-mount – Pre-drilled holes for bolted installation.

✦ Hardened gear teeth – Wear-resistant and durable.

✦ Compact section height – Uniform 56 mm profile.

✦ Standardized clearances – Consistent radial and tilting gap specs.

✦ Wide diameter range – Fits bore sizes from 342 mm to 1,024 mm.


Further Reading