SUN 683 2 25 01 AA LM

KD320 None geared
  • KD320 None geared
  • KD320 None geared

SUN 683 2 25 01 AA LM-KD320 None geared

The gearless double-row series is a range of heavy-duty slewing bearings featuring two rows of rolling elements without gear teeth on either ring. This configuration is designed for applications that demand exceptional load capacity and rigidity, where the drive system is kept separate from the bearing and rotation is achieved through external means.



Typical Applications:

Large cranes and excavators

Tower cranes and mobile cranes

Wind turbine yaw and pitch systems

Large solar tracking arrays

Radar and antenna positioning systems

Heavy-duty industrial turntables



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

KD320 None geared
Type :SUN 683 2 25 01 AA LM
Brand :LYMC
Outer Dimensions
Da [mm] :683
Di [mm] :490
H [mm] :g2
Outer Holes
La [mm] :651
na :48-2
Inner Holes
Li [mm] :537
ni :48
Weight
KG :110

Characteristics

✦ Dual-row ball configuration – Two rows of balls arranged in an offset pattern, with each row positioned at different pitch diameters to broaden the load-supporting footprint.

✦ Toothless ring design – Both inner and outer rings are manufactured without gear teeth, featuring plain cylindrical surfaces for integration with external drive elements.

✦ Split-raceway construction – Each ball row operates in a separately machined raceway channel, with a solid dividing wall between the rows for structural separation.

✦ Through-hardened rings – The rings are through-hardened to 42–46 HRC, with raceways induction-hardened to 56–60 HRC for a wear-resistant surface.

✦ Wide cross-section geometry – Rings feature a broad radial width with a height-to-width ratio of 1.5:1, optimized for heavy radial load capacity.


Features

✦ Handles heavy radial loads – The wide, offset ball rows provide exceptional radial load capacity, ideal for applications with significant side forces.

✦ Easier integration with existing drives – Toothless rings allow direct coupling to chain, belt, or friction drives without gear matching constraints.

✦ Reduces machine footprint – The split-raceway design allows for a narrower overall width compared to single-row designs with equivalent capacity.

✦ Simplifies mounting alignment – The double-ring bolt pattern offers flexible attachment options, reducing the need for precise alignment during installation.

✦ Withstands heavy impacts – Through-hardened rings resist deformation from sudden shock loads, making them suitable for heavy mobile equipment.

✦ Versatile mounting – Bolt holes on both rings allow the bearing to serve as either a rotating or stationary mount, depending on application needs.


Further Reading