VSA250755-N Slewing Bearings
Gear: External gear, module m9 / 98 teeth, pitch circle d0 per medias official data
Dimensions: bore 655 mm × OD 898 mm × height 80 mm, weight 127.1 kg (Schaeffler medias official)
Load capacity: dynamic axial Ca = 395 kN, static axial C0a = 2,700 kN, dynamic radial Cr = 360 kN, static radial C0r = 1,230 kN
Tooth force Fz max = 80.2 kN (per medias data)
Max. radial load on fixing screws Fr zul = 290.4 kN (friction-locking mount)
Clearance spec: Normal: 0.03–0.13 mm; precision class P0 / P6 / P5 available
Material: 50Mn / 42CrMo4 rings, GCr15 balls, double-lip NBR seals, -25 to +80 °C operating range
Standard series envelope — mounting-compatible with the whole VSA Standard 25 family across the 414 → 1094 (or 755 → 1055) raceway range
Primary application: Heavy Excavators and Cranes (25-series mid-size)
- Product Description
VSA250755-N Slewing Bearings — INA VSA Series 25 External Gear Four-Point Contact Ball Slewing Ring
Luoyang Heng Guan Bearing Technology Co., Ltd., a bearing manufacturer with headquarters in Luoyang, China, produces VSA250755-N Slewing Bearings. This type is part of the INA VSA Standard 25 series: an external gear, four-point contact ball slewing ring with a 755 mm raceway diameter. Important rated parameters include a static axial load capacity of 2,700 kN and a total weight of 127.1 kg. This type factory-direct is supplied by ISO 9001 certified Heng Guan in accuracy grades P0, P6 and P5.
Full Specification Table
Parameter | Value |
Model | VSA250755-N |
Raceway Diameter (DL) | 755 mm |
Inner Ring Bore (di) | 655 mm |
Outside Diameter (Da) | 898 mm |
Total Height (H) | 80 mm |
Weight | 127.1 kg |
Gear Module (m) | 9 mm |
Number of Teeth (z) | 98 |
Gear Pitch Circle (d0) | 882 mm |
Dynamic Axial Load (Ca) | 395 kN |
Static Axial Load (C0a) | 2,700 kN |
Dynamic Radial Load (Cr) | 360 kN |
Static Radial Load (C0r) | 1,230 kN |
Max. Radial Load on Fixing Screws (Fr zul) | 290,400 N |
Outer Bolt Circle (La) / Qty | 816 mm / 24 holes |
Inner Bolt Circle (Li) / Qty | 695 mm / 24 holes |
Radial Clearance (Normal) | 0.03–0.13 mm |
Operating Temperature | -25 to +80 °C |
Ring Material | 50Mn / 42CrMo4 |
Ball Material | GCr15 |
Seal | Double-lip NBR |
Precision Class | P0 / P6 / P5 |
Structure | Four-point contact ball / single row |
Structural Features
The four-point contact ball design allows a single ball row to carry axial, radial, and tilting moment loads simultaneously, keeping the overall assembly more compact than a multi-row arrangement at comparable load levels.
The external gear runs module m9 with 98 teeth on an 882 mm pitch circle. The normalized (N) tooth profile supports a continuous tooth force of 55.1 kN and a peak tooth force of 80.2 kN, which fits the swing-drive requirements of 25-tonne class excavators.
Ring material is 50Mn or 42CrMo4 steel (quenched and tempered), with induction-hardened raceways achieving 55–62 HRC surface hardness. The core remains ductile to absorb shock loads. Rolling elements use GCr15 bearing-grade balls. Double-lip NBR seals are fitted as standard to limit ingress of dust and moisture.
The bolt pattern — 24 holes on a 695 mm inner bolt circle and 24 holes on an 816 mm outer bolt circle — is shared across the VSA Standard 25 family, which simplifies mounting when replacing other bearings in the same series.
Compared to the gearless VSU250755 (655 mm bore × 855 mm OD × 63 mm height, 89.1 kg, Ca 340 kN), this external-gear model is larger at 898 mm OD and 80 mm height to accommodate the gear teeth, and carries higher dynamic load ratings.
Typical Applications
Heavy Excavators and Material Handlers
This is the primary application for the VSA Standard 25 mid-size slewing ring. The m9 external gear meshes with the swing pinion, while the 24-bolt outer flange secures the ring under repeated digging shock loads.
Cranes and Heavy Lifting Equipment
Crane slewing sections in the 755 mm raceway range require an external-gear ring that can carry dynamic hoist loads. The C0a of 2,700 kN provides substantial static capacity for load-holding positions.
Wind Turbine Yaw Systems
Larger turbine yaw rings in the 25-series use external-gear pinion drives at the tower top. The double-lip NBR seal helps reduce moisture ingress at elevated installation heights.
Large Solar Trackers and Slewing Drives
Utility-scale worm drives mesh with the external gear from outside the ring. The 755 mm raceway diameter provides sufficient structural clearance for large tracker frames.
Mining and Quarrying Equipment
Drill rig pivots and conveyor turntables operating in high-shock, debris-rich environments can use the heavier 25-series cross-section for added durability.
Offshore and Marine Equipment
Marine deck cranes and offshore turntables exposed to salt spray may require additional surface treatment beyond the standard NBR-sealed design; this can be discussed at the inquiry stage.
Manufacturing and Quality
Each Heng Guan brand VSA250755-N is subject to a multi-stage inspection process. The equipment includes coordinate measurement devices, vibration testers and life testing machines. The traceability of materials is guarantyd from raw steel to completed product. On site equipment includes CNC vertical lathes, CNC quenching machines, CNC gear shapers, big gear hobbing machines and machining center.
VSA250755-N Slewing Bearings are made to DIN, ISO and GB standards and are RoHS compliant. Heng Guan serves clients in more than 50 countries including the United States, Germany, the United Kingdom, Australia, Turkey, Russia and the Middle East. MOQ: 1 item. Confirmation of engineering is available within 24 hours of request.
OEM and ODM are welcomed. Services include technical consulting, product design assistance, installation support, reverse mapping of old parts, and special machining of non-standard parts. Standard stock versions are available for immediate shipment. Lead times for non-stock configurations will be contingent on order volume and will be verified upon inquiry.
FAQ
Q: What does VSA250755-N mean?
A: INA VSA Standard 25 series. It is four point contact ball slewing ring with external gear. Dimensions: 655 mm bore, 898 mm O.D. 80 mm height, 755 mm raceway dia., 127.1 kg.
Q: What are the gear specifications?
A: Module 9, 98 teeth, 882 mm pitch circle, normalised (N) profile, external gear. Continuous tooth force 55.1 kN; Peak tooth force 80.2 kN.
Q: What is the difference between the VSA250755-N and VSU250755?
A: VSA250755-N is toothed (m9 / z98), 898 mm OD, 80 mm height, 127.1 kg, Ca 395 kN. VSU250755 is toothless, 855 mm OD, 63 mm height, 89.1 kg, Ca 340 kN. You choose depending on whether you need an external gear interface for your drive setup.
Q. Is this a straight dimensional replacement for the INA VSA250755-N?
A: Heng Guan also conforms to the same mounting standard and dimensions. “INA” is a third party trademark and is used herein purely for the purpose of compatibility identification. Heng Guan is not affiliated with Schaeffler or INA.
Q: What is the recommended lubrication interval?
A: Re-lube the raceway every 100 hours for excavators and heavy excavator. Open gearing should be re-lubricated after every 50 hours of operation. In humid conditions increase frequency to assist drain moisture from the contact zone.
Q: How can I ask for a quote/availability?
A: Contact Us immediately using the contact information below.
Contact Us
For pricing, stock availability, and technical inquiries about VSA250755-N Slewing Bearings, reach our team at mia@hgb-bearing.com.
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