VSU200544 Slewing Bearings

VSU200544 Slewing Bearings — INA VSU Standard 20 Series Four-Point Contact Ball Slewing Ring

VSU200544 Slewing Bearings belong to the INA VSU Standard 20 series — a gearless, single-row four-point contact ball slewing ring with a 544 mm raceway diameter, 870 kN static axial load capacity, and a total weight of 37.41 kg. The four-point contact ball design allows one ball row to carry axial, radial, and tilting moment loads simultaneously, making this ring suitable for mid-size cranes, excavators, solar trackers, and rotary indexing equipment. Heng Guan Bearing supplies this model from Luoyang, China, with full technical documentation available on request.

What Is the VSU200544?

The VSU200544 is a gearless slewing ring from the INA VSU Standard 20 series. Its single-row four-point contact ball structure allows one ball row to carry axial, radial, and tilting moment loads at the same time — a useful characteristic for mid-size equipment where combined loading is typical.

With no gear teeth on the ring itself, rotation is delivered through an external drive: a pinion on a customer gear ring, a chain or belt drive, a friction wheel, or a hydraulic/electric motor coupled to the turntable structure. This arrangement gives engineers freedom to design the drive system independently of the bearing selection.

The ring shares mounting compatibility with the entire VSU Standard 20 family (raceway range 414–1094 mm), so scaling a design within the series does not require changing the bolt pattern layout.

Full Technical Specifications

Data source: Schaeffler medias official catalogue (retrieved 2026-08-17).

Materials & Design Details

The rings are made of 50Mn or 42CrMo4 steel, which are high-alloy structural steels that are quench-and-temper heat treated for core toughness. The raceways are induction hardened to a surface hardness of 55–62 HRC for fatigue endurance, with core ductility for shock absorption.

The rolling elements are GCr15 bearing steel balls. The assembly is equipped with double-lip NBR seals that retain grease and prevent the introduction of contaminants. The −25 to +80 °C working temperature range covers a wide variety of outdoor and industrial situations.

Available precision classes are P0, P6 and P5. Reduced clearance and preloaded versions are available on request.

Typical Applications

The VSU200544 Slewing Bearings is applicable for usage in situations where a raceway diameter of 544 mm and the related load ratings are suitable for the equipment requirements.

· Cranes & Lifting Platforms – Mid-size mobile and tower cranes, which demand larger hook loads and tilting moments than the 414 mm band can provide. The static safety margin is good with a C0a of 870 kN.

· Excavators & Construction Excavator — 20-tonne class swing turntables and material handlers, four-point contact design for stress loading, double-lip seals to prevent intrusion of debris.

· Solar Trackers – Utility-scale single-axis and dual-axis trackers that incorporate the gearless ring with linear-actuator or external-pinion motors in outdoor PV farm environments.

· Wind Turbine Yaw Systems – 544 mm envelope mid size turbine nacelles with external pinion drives.

· Radar & Antenna Platforms – Large dish antennas with a larger tilt-moment capability than the 414 mm band, where regulated clearance provides reliable tracking.

· Rotary Indexing Tables & Material Handling – Gearless, chain or friction wheel operated, for packing turntables and conveyor diverters; 32 hole bolt pattern for typical turntable attachment.

· Marine & Deck Equipment – Marine winches and deck cranes with NBR-sealed construction for protection in humid, salt-spray situations.

Sourcing VSU200544 Slewing Bearings from Heng Guan Bearing

Heng Guan Bearing is Luoyang based producer specialised in slewing rings and precision bearings. ISO 9001 certified. The firm sells VSU200544 as a separately made item in accordance with the same mounting standard as the original INA reference.

Source details:

· Factory Direct Supply -- MOQ 1pc; Engineering Confirmation within 24hours

· Lead Time — Please Contact Us for current stock availability and lead time on your requested amount.

· ISO 9001 certified manufacturing – includes use of coordinate measuring equipment, vibration testing and life testing

· Complete material traceability — managed from receipt of raw materials to inspection of the completed product

· OEM/ODM support — unique non-standard parts including big gears, ring gears and couplings with drawings

• Precision grades – P0, P6 and P5 available, similar with the original INA series possibilities

• Technical support – help with selection, installation instructions and technical enquiries answered by our in-house engineers

FAQ

Q: What is the VSU200544?

A: It is a gearless four-point contact ball slewing ring from the INA VSU Standard 20 series. Key dimensions: 472 mm bore × 616 mm OD × 56 mm height, weighing 37.41 kg, with a 544 mm raceway diameter.

Q: What are the load ratings for the VSU200544?

A: Dynamic axial Ca = 152 kN, static axial C0a = 870 kN, dynamic radial Cr = 138 kN, static radial C0r = 400 kN. Maximum radial load on fixing screws is 132,200 N (friction-locking mount).

Q: How does the VSU200544 compare to the VSU200414?

A: Both share the same 56 mm section height and series-20 envelope. The VSU200544 has a 544 mm raceway and 870 kN static axial capacity; the VSU200414 has a 414 mm raceway and 660 kN static axial capacity — approximately a 32% increase in static axial load rating.

Q: How is a gearless slewing ring driven?

A: With no gear teeth on the ring, rotation is delivered through an external pinion on a customer gear ring, a chain or belt drive, a friction wheel, or a hydraulic/electric motor coupled to the turntable structure.

Q: Is the VSU200544 interchangeable with bearings from other manufacturers?

A: The VSU200544 designation originates with INA. Heng Guan supplies this model as an independently manufactured bearing to the same mounting standard. For cross-reference to other series, contact our engineering team with your drawing or requirement.

Q: What clearance and precision options are available?

A: Standard radial clearance is 0–0.3 mm. Precision classes P0, P6, and P5 are available. Reduced clearance and preloaded variants are offered on request.

Contact Us

For pricing, availability, CAD drawings, or technical questions about VSU200544 Slewing Bearings, contact us at mia@hgb-bearing.com. We respond to all inquiries within one business day.