VSA200544-N Slewing Bearings

VSA200544-N Slewing Bearings — INA VSA Standard 20 External Gear Four-Point Contact Ball Slewing Ring

VSA200544-N Slewing Bearings belong to the INA VSA Standard 20 series — an external-gear, four-point contact ball slewing ring with a 544 mm raceway diameter, 472 mm bore, 640.3 mm outside diameter, and 56 mm section height. Weighing 43.215 kg, this ring handles axial, radial, and tilting moment loads within a single compact row. It is widely specified for crane swing sections, excavator upper structures, and other slow-rotation, high-load applications where a reliable external-gear interface is required.

Full Specifications

All dimensional and load data are sourced from the Schaeffler medias official catalogue.

Design Features

Four-point contact ball structure — A single ball row carries axial, radial, and tilting moment loads simultaneously. This eliminates the need for stacked bearing rows, reducing assembly height and structural complexity in swing sections where space is constrained.

External gear with normalized (N) profile — The module m6, 105-tooth external gear on a 630 mm pitch circle provides a direct interface for external pinion drives. In the INA gear-teeth designation system the "N" suffix denotes normalised gear teeth, where "H" is hardened and "V" is quenched and tempered — it describes the tooth heat-treatment condition, not the flank geometry. Allowable tooth loads for this gearing are Fz norm 21.3 kN for tooth-root fatigue strength (shock factor 1.2) and Fz max 31.5 kN against tooth fracture (shock factor 1.35).

Static axial load margin — C0a reaches 870 kN at the 544 mm raceway within a 56 mm section height. In crane and lifting applications where slow rotation and intermittent high loads are the norm, the static capacity is typically the governing selection criterion rather than the dynamic rating.

Ring and ball material — Rings are manufactured from 50Mn or 42CrMo4 alloy steel. Balls are GCr15 bearing steel. Double-lip NBR seals protect the raceway across the full -25 to +80 °C operating range, limiting contaminant ingress in field conditions.

VSA200544-N slewing bearings Standard 20 series dimensional consistency — The VSA Standard 20 family covers a raceway range of 414–1094 mm with a shared 56 mm section height. Bolt circle patterns and interface dimensions are consistent across the series, which simplifies direct replacement or upgrade within the same envelope.

Precision class options — Available in P0, P6, and P5. P5 class is suitable for applications requiring tighter rotational accuracy, such as radar platforms or rotary indexing tables.

Typical Applications

Cranes and lifting equipment — Tower cranes and mobile cranes in the mid-size range commonly use external-gear slewing rings at the 544 mm raceway diameter. The C0a 870 kN static capacity supports heavier hook loads without raceway deformation under peak loading.

Excavators and construction excavator — The 20-tonne excavator swing system is a standard application for this ring size. The external gear meshes with a swing pinion in a well-established configuration, and the double-lip NBR seal limits debris ingress on construction sites.

Solar trackers and slewing drives — Worm-gear slewing drives mesh with the external gear from outside while the ring bore accommodates the tracker pivot structure. The sealed design and -25 to +80 °C operating range cover a broad range of PV installation climates.

Wind turbine yaw systems — Mid-size wind turbines at this diameter class use external-gear yaw rings with side-mounted drive pinions. The four-point contact structure handles the combined axial and tilting moment loads generated by nacelle rotation under variable wind conditions.

Radar and antenna platforms — The four-point contact configuration maintains consistent clearance under the tilting moments imposed by wind loads or dynamic tracking movements, making it a practical choice for large dish and antenna structures.

Marine deck equipment — Marine winches and deck cranes operating in humid or salt-spray environments benefit from the NBR-sealed raceway. Confirm any additional surface treatment requirements with the engineering team based on your specific service conditions.

Manufacturing and Quality Verification

Heng Guan Bearing manufactures slewing bearings with diameter ranging from 50 mm to 10,000 mm with accuracy ratings P0, P6, P5 and P4. Production equipment includes CNC vertical lathes, CNC quenching machines, CNC gear shapers, machining centers, grinding machines and big gear hobbing machines. Dimension and performance verification is carried out using coordinate measuring equipment, vibration testers and life testing machines, with complete material and process traceability from raw stock to finished ring.

We provide engineering assistance, including application advice, installation instructions, cross-reference mapping for replacement projects, and OEM/ODM customisation for non-standard working situations.

FAQ

Q: What does VSA200544-N mean?

A: The INA VSA Standard 20 series four-point contact ball slewing ring is what it is. The key measurements are 472 mm in diameter, 640.3 mm in width, and 56 mm in height. It weighs 43.215 kg and has a C0a 870 kN static axial load capacity. It has an external gear with 6 teeth and 105 teeth.

Q: What's the difference between VSA200414-N and VSA200544-N?

Q: Both have the same section height of 56 mm in the VSA Standard 20 envelope. VSA200544-N has a 544 mm raceway that weighs 43.215 kg, is m6/z105, and has a C0a of 870 kN. VSA200414-N has a 414 mm raceway that weighs 31.3 kg, is m5/z99, and has a C0a of 660 kN. If the job needs a bigger raceway diameter or more static load capacity, choose VSA200544-N.

Q: What is the appropriate time between re-lubrications?

A: People usually say that the track should be re-oiled every 100 hours of operation for cranes and excavators. Automatic lubrication systems can help keep grease evenly distributed and get rid of contaminants when there is a lot of moisture in the air or when the machine is rotating all the time. Based on real job cycles, confirm the exact time range with the manufacturer of your equipment or an application expert.

Q: Can the VSA200544-N work in temperatures below zero?

A: In general, the range of temperatures is from -25 to +80 °C. If you're installing something that will be exposed to temperatures below -20 °C for a long time, make sure the engineering team knows what grease to use and what grade of material to use before you place your order.

Q: How do I request pricing or confirm availability?

A: Contact mia@hgb-bearing.com with your required quantity, application details, and any cross-reference information. Engineering confirmation is provided within 24 hours of inquiry.

Contact Us

For pricing, availability, or technical inquiries on VSA200544-N slewing bearings, reach us at mia@hgb-bearing.com. Our engineering team responds within 24 hours.