VSU250755 Slewing Bearings
Gear: Gearless (no gear teeth), driven by external pinion / chain / friction / motor
Dimensions: bore 655 mm × OD 855 mm × height 63 mm, weight 89.06 kg (Schaeffler medias official)
Load capacity: dynamic axial Ca = 340 kN, static axial C0a = 2,700 kN, dynamic radial Cr = 305 kN, static radial C0r = 1,230 kN
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 VSU Standard 25 family across the 414 → 1094 (or 755 → 1055) raceway range
Primary application: Heavy Excavators and Cranes (25-series mid-size)
- Product Description
VSU250755 Slewing Bearings — INA VSU Standard 25 Series Gearless Four-Point Contact Ball Slewing Ring
VSU250755 Slewing Bearings is INA VSU Standard 25 series gearless four-point contact ball slewing ring, raceway diameter 755 mm, section height 63 mm and weight 89.06 kg. It has a static axial load capacity of 2,700 kN and is thus suitable for big excavators, cranes and similar machines where combined axial, radial and tilting moment loads act at the same time. Heng Guan Bearing delivers it to the same fitting quality as the original INA reference.
What Is the VSU250755?
The INA Standard 25 series VSU250755 is a single row, four point contact ball slewing ring without gear. The four-point contact ball design makes it possible to load one ball row simultaneously with axial, radial, and tilting moment loads – decreasing the number of components and making it easier to integrate into multi-row setups.
The mode of driving is left open, because the gearless ring has no gear teeth: external pinion, chain, friction wheel or direct motor connection all function with it. This versatility makes it suitable for use in excavator swing systems, crane slewing sections, wind turbine yaw systems, huge solar trackers, maritime deck equipment and heavy rotational platforms.
Its 63 mm section height puts it in the mid-size of the VSU25 family. In the series there are other height variations of 56 mm and 80 mm – please check which one is suited for your application before purchase.
Full Technical Specifications
Parameter | Value |
Model | VSU250755 |
Raceway Diameter (DL) | 755 mm |
Inner Ring Bore (di) | 655 mm |
Outside Diameter (Da) | 855 mm |
Total Height (H) | 63 mm |
Weight | 89.06 kg |
Dynamic Axial Load (Ca) | 340 kN |
Static Axial Load (C0a) | 2,700 kN |
Dynamic Radial Load (Cr) | 305 kN |
Static Radial Load (C0r) | 1,230 kN |
Max. Radial Load on Fixing Screws (Fr zul) | 290,400 N |
Outer Bolt Circle (La) / Qty | 815 mm / 24 |
Inner Bolt Circle (Li) / Qty | 695 mm / 24 |
Radial Clearance | Normal: 0.03–0.13 mm |
Operating Temperature | −25 °C 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 |
Data source: Schaeffler medias official catalogue (retrieved 2026-08-17)
Materials and Construction
Outer and inner rings are made of alloy steel 50Mn or 42CrMo4. Raceways are induction hardened to 55-62 HRC. The hardened surface resists wear during many load cycles. The core is sufficiently ductile to absorb stress. GCr15 bearing steel balls are rolling components.
The double-lip NBR seal minimises grease loss and prevents contaminant infiltration – important in excavator and crane situations where the bearing is often exposed to debris, dust and moisture. The 25 °C to +80 °C operational temperature range covers most basic field settings. If applications are consistently below -20 °C, consult with the technical team for the correct grease standard and steel grade before purchase.
Bolt Pattern and Series Compatibility
The VSU250755 Slewing Bearings has 24 fastening holes on an 815 mm outer bolt circle and 24 holes on a 695 mm inner bolt circle. In the 25 series, bolt circles and hole counts vary with size: 28 holes (915 / 795) on the 855, 30 holes (1,015 / 895) on the 955. So this design is size-specific. A unit of the same designation bolts right on, changing to another size in the series needs the mating structure to be rechecked.
The Standard 25 section (63 mm height, 22 mm fixing bores, 0.03 – 0.13 mm typical radial clearance) is different from the Standard 20 section (56 mm height, 14 mm fixing bores). Check the installed series before considering the two as interchangeable.
Application Scenarios
· Heavy Excavators and Mining Shovels — The 2,700 kN static axial capacity and 63 mm section address the combined shock and payload loads typical of excavator swing systems.
· Cranes and Heavy Lifting — Crane slewing sections benefit from the 290,400 N maximum radial load rating on fixing screws, which supports reliable bolt retention under dynamic hoist loads.
· Wind Turbine Yaw Systems — The gearless ring pairs with external pinion drives for nacelle rotation on larger turbines.
· Large Solar Trackers — High tilt-moment tracker pivots in the 25-series range work with linear actuator or external pinion drives.
· Offshore and Marine Equipment — Marine deck cranes and winches use the double-lip NBR sealed design; anti-corrosion surface treatment options are available on request.
· Heavy Rotary Platforms and Radar Antennas — Chain or friction-wheel driven gearless rings suit process turntables, large radar dishes, and satellite tracking platforms.
About Heng Guan Bearing
Luoyang Heng Guan Bearing Technology Co., Ltd. is located in Luoyang, China, with over 30 years of industry experience and a team of more than 50 R&D and manufacturing professionals. The company is ISO 9001 certified and RoHS compliant. Slewing bearings are produced across a diameter range from 50 mm to 10,000 mm in precision grades P0, P6, P5, and P4.
Production equipment includes CNC vertical lathes, CNC quenching machines, CNC gear shapers, machining centers, grinding machines, and large gear hobbing machines. Quality control uses coordinate measuring machines, vibration testers, and life testing machines. Each batch is fully traceable from raw material to finished product.
OEM and ODM partnerships are supported. Services include technical consultation, product design, installation guidance, legacy product mapping, and non-standard customization.
FAQ
Q: Is this a direct replacement for the original INA VSU250755?
A: Yes, as a stand alone equivalent. The INA reference number for this size is VSU250755 and Heng Guan manufacture to the same catalogue specifications. This marking is for identifying purposes only and Schaeffler is not necessarily the source.
Q: What is this bearing's load rating?
A: Dynamic axial Ca = 340 kN Static axial C0a = 2700 kN Dynamic radial Cr = 305 kN Static radial C0r = 1230 kN Max radial load on fastening screws 290400 N. These are statistics from the official catalogue of the Schaeffler medias.
Q: What is the difference between the Standard 25 and Standard 20 series?
A: Standard 25 has a 63 mm section height compared to 56 mm for Standard 20, bigger 22 mm fixing bores compared to 14 mm, a narrower normal clearance (0.03-0.13 mm) and a much greater static capacity at similar raceway sizes. The two series are not immediately substitutable.
Q: Do you have size options?
A: The section heights of the VSU25 series are 56 mm, 63 mm and 80 mm. Please verify your application height requirement before ordering.
Q: What is the standard re-lubrication practice?
A: Re-lubrication periods are dependent on the operating circumstances, load cycles and the grease utilised. Consult the Schaeffler medias maintenance recommendations or call our technical team for a suggestion for your application.
Q: What is the minimum order quantity and lead time?
A: MOQ is 1 pc. Standard stock models are ready for fast shipping. Please Contact Us for current stock status and lead time according to your particular demand.
Contact Us
For pricing, availability, or technical questions about VSU250755 Slewing Bearings, reach our team directly.
Email: mia@hgb-bearing.com
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