VSA200644-N Slewing Bearings

VSA200644-N Slewing Bearings — INA VSA Standard 20 External Gear Four-Point Contact Ball Slewing Ring for Solar Trackers & Cranes

VSA200644-N Slewing Bearings are single row four point contact ball slewing rings with a raceway diameter of 644 mm, external gear (m6/z122) and a static axial load capability of 1,040 kN. They are part of the INA VSA Standard 20 series. The single ball row can transmit axial, radial and tilting moment loads concurrently, which simplifies the machine construction and minimises the total number of parts. ISO 9001 certification & Factory direct supply from Luoyang Heng Guan Bearing Technology Co., Ltd. Export to 50+ countries.

What Is the VSA200644-N?

The VSA200644-N is an external-gear, four-point contact ball slewing ring from the INA VSA Standard 20 series. Its normalized (N) gear profile allows a pinion or worm drive to mesh from outside the ring OD — the standard configuration for solar tracker worm drives and crane swing pinions. Because this bearing shares the full VSA Standard 20/25 envelope, it is mounting-compatible with the entire VSA Standard 20 family, making it a direct OEM replacement for the INA VSA200644-N.

Key structural dimensions:

· Raceway diameter: 644 mm

· Bore × OD × Height: 572 mm × 742.3 mm × 56 mm

· Weight: 52.1 kg

· External gear: module 6, 122 teeth, pitch circle 732 mm, normalized (N) profile

· Tooth force: 21.3 kN continuous / 31.5 kN peak

Full Technical Specifications

Data per Schaeffler medias catalogue.

Materials & Quality

The VSA200644-N Slewing Bearings are composed of 50Mn or 42CrMo4 alloy steel with induction hardened raceways with surface hardness of 55–62 HRC. The ductile core allows the ring to take stress loads in crane and construction equipment duty cycles.

The balls are made of GCr15 bearing steel. The double-lip NBR seals prevent the loss of grease and restrict the entry of contaminants across the whole working range of -25 to +80 °C, making the sealed design appropriate for outdoor PV systems and mobile equipment operating in varied conditions.

Each bearing is inspected on a Coordinate Measuring Machine, vibration tested and life tested before shipping. We track the raw material input through to the completed product under the ISO 9001 quality standard. Our products are in accordance with DIN, ISO and GB standards. We also have RoHS compliance.

Typical Applications

Solar Trackers (Utility-Scale PV)

The worm drives from the outside with the ring OD. The bore is where the tracker pivot is. The 644 mm raceway diameter is suitable for the larger tilt moments of mid-to-large size tracker constructions. The sealed NBR design and broad temperature range are suitable for outdoor PV farm operation in all seasons.

Mobile & Tower Crane

External-gear rings in the 644 mm range mate with outer pinion drives on tower crane and mid-size mobile crane slew sections. The static axial capacity of 1,040 kN gives the margin for larger hook loads.

Excavators and Construction Equipment

This bearing series is intended to accommodate the conventional excavator swing layout with an external-gear ring and a swing pinion outside.

Yaw Systems for Wind Turbines

Mid-size turbine yaw drives use external-gear rings attached to yaw pinions on the top of the tower. Side access for maintenance is maintained by the exterior gear arrangement.

Radar, Antenna Platforms and Rotary Indexing Tables

The series provides stable low speed rotation and side-mounted pinion access, making it a viable choice for antenna pedestals and industrial turntables when the area within the bore is reserved for cabling or Shafts.

Sourcing & Capabilities

Heng Guan Bearing produces slewing bearings in diameters from 50 mm to 10,000 mm and in accuracy ratings P0, P6, P5 and P4. The production equipment comprises CNC vertical lathes, CNC quenching machines, CNC gear shapers, big gear hobbing machines, machining centers and grinding machines.

The team also manages OEM/ODM relationships, reverse engineering from existing parts and non standard custom parts like big gears, ring gears, shafts and couplings. Engineering confirmation within 24 hours MOQ is 1 pcs. Our products are shipped to United States, Germany, United Kingdom, Italy, Turkey, Russia, Austria, Norway, Australia, Mexico, Malaysia, South Africa, Middle East and other markets.

FAQ

Q: What is the VSA200644-N?

A: It is a four-point contact ball slewing ring with external gear INA VSA Standard 20 Series raceway dimension 644 mm, bore 572 mm, OD 742.3 mm, height 56 mm weight 52.1 kg.

Q: What is the load capacity?

A: Dynamic axial Ca=162 kN, static axial C0a=1,040 kN; dynamic radial Cr=147 kN, static radial C0r=475 kN (Schaeffler medias catalogue).

Q: What is the gear specification?

A: External gear, module 6, 122 teeth, pitch circle 732 mm, normalised (N) profile. Tooth force: 21.3 kN constant, 31.5 kN peak.

Q: How does the external gear drive operate?

A: The gear teeth on the outside ring OD are driven by a pinion or worm from the outside, making the drive accessible for installation and maintenance – the traditional configuration for solar tracker worm drives and crane swing pinions.

Q: What is the difference between VSA200644-N and VSA200544-N?

A: Both utilise the Series 20 envelope (56 mm tall). VSA200644-N 644 mm racetrack 572 x 742.3 x 56 mm 52.1 kg m6/z122 C0a 1.040 kN VSA200544-N 544 mm raceway 472 x 640.3 x 56 mm 43.2 kg m6/z105 C0a 870 kN.

Q: Is it in stock?

A: Stock models ship within 2–3 days, MOQ 1 pc. Contact mia@hgb-bearing.com for current availability, drawings, and pricing.

Contact Us

For pricing, availability, drawings, or OEM inquiries on VSA200644-N Slewing Bearings, reach our engineering and sales team directly at mia@hgb-bearing.com.