VSU250955 Slewing Bearings

VSU250955 Slewing Bearings — INA VSU25 Series Gearless Four-Point Contact Ball Ring

VSU250955 Slewing Bearings belong to the INA VSU Standard 25 heavy series — a gearless, single-row, four-point contact ball slewing ring with a 955 mm raceway diameter. Manufactured by Luoyang Heng Guan Bearing Technology Co., Ltd., this model carries a static axial load of 3,400 kN within a compact 63 mm section height. It is available in precision classes P0, P6, and P5, and meets ISO 9001 quality standards. The design suits heavy excavators, wind turbine yaw systems, and large crane applications.

What Is the VSU250955?

The VSU250955 Slewing Bearings is a gearless four-point contact ball slewing ring from the INA VSU Standard 25 heavy series. Its 955 mm raceway diameter places it at the larger end of the VSU25 family, which covers the 414 mm to 1,094 mm raceway range.

The single-row, four-point contact ball design allows one ball row to carry axial, radial, and tilting moment loads simultaneously. Combined load handling is achieved without multiple bearing rows, keeping the overall section compact at 63 mm height.

Because there are no gear teeth on either ring, rotation is provided by an external pinion, chain or belt drive, friction wheel, or hydraulic/electric motor via gearbox — giving the designer flexibility to match the drive system to the machine architecture.

Ring material is 50Mn or 42CrMo4 steel, with raceways induction-hardened to 55–62 HRC for fatigue resistance while the core remains ductile to absorb shock loads. Balls are GCr15 bearing steel. Double-lip NBR seals retain grease and block contamination across an operating range of -25 °C to +80 °C.

VSU250955 Full Specifications

Data source: Schaeffler medias official catalogue.

Key Product Features

Four point contact, single row.One row of GCr15 balls can take the axial, radial and tilting moment loads at the same time. Combined load capacity without the extra weight of a multi-row construction.

Ring without gears, with many driving variants.Neither ring has gear teeth drilled into it. Rotation may be powered by an external pinion, chain, friction wheel or motor gearbox – whichever best matches the machine layout.

955 mm High static load capacity axialThe C0a of 3,400 kN is an increase of almost 11% compared to the VSU250855 (C0a 3,050 kN), in the same 63 mm section height, and offers a greater load margin at a similar mounting footprint.

Compatible with series mounting envelope.There is no uniform bolt pattern for the 25 series, the 755 has 24 holes on 815 / 695, the 855 has 28 on 915 / 795 and the 955 has 30 on 1,015 / 895. A direct dimensional replacement is just a unit with the same designation. Moving between sizes needs the mating structure to be rechecked.

Material and seal combination.Rings in 50Mn or 42CrMo4. Induction hardened raceways at 55-62 HRC. Balls in GCr15. Double lip seals in NBR. All these combine to withstand outside stress loads and minimise loss of grease or intrusion of pollution.

Precision class choices.Available in P0, P6, and P5. Reduced clearance and preloaded versions may be supplied on request for applications with tighter rotational control.

Typical Applications

Heavy excavators (50–70 tonne class). The 955 mm raceway and 3,400 kN static axial capacity are sized for large swing systems where the VSU20 series reaches its load limits. The 30-bolt inner pattern is suited to absorb digging shock loads in heavy construction duty.

Wind turbine yaw systems. Large turbine nacelles use gearless yaw rings driven by external pinion. The -25 °C to +80 °C operating range and NBR-sealed design support extended outdoor service.

Large tower cranes and mobile cranes. When a design at the 855 mm raceway band is load-limited, the 955 mm raceway delivers additional static axial margin for heavier hook loads.

Mining shovels and aggregate equipment. The four-point contact ball design handles severe shock loads, and the double-lip seals limit ingress of abrasive contamination common in mining environments.

Heavy rotary indexing tables. Gearless rings driven by chain or friction wheel are compatible with large-turntable mounting patterns. The 30-hole bolt circle supports large-format process turntables.

Marine deck equipment. Marine winches and deck cranes operating in salt-spray environments benefit from the sealed ring design.

About Heng Guan Bearing

Luoyang Heng Guan Bearing Technology Co., Ltd. is located in Luoyang, a recognized center of China's bearing industry. The company specializes in the research, development, manufacturing, and sales of high-precision bearings, with a team of over 50 members.

Slewing bearing production covers diameters from 50 mm to 10,000 mm across 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. The full process from raw material to finished product is traceable, and products comply with DIN, ISO, and GB standards. The company holds ISO 9001 certification and RoHS compliance.

Technical services include product consultation, design support, installation guidance, legacy product mapping, and non-standard customization. OEM and ODM partnerships are supported. MOQ is 1 piece, and standard stock models ship within 5–7 days.

FAQ

Q: What is the VSU250955?

A: Our products are a gearless, four-point contact ball slewing ring from the INA VSU Standard 25 heavy series. Key dimensions: 855 mm bore, 955 mm raceway, 63 mm height, 115 kg weight. The 30-hole inner bolt circle sits on an 895 mm circle diameter.

Q: What is the difference between VSU250955 and VSU250855?

A: The two share the envelope of Series 25 (63 mm height). The VSU250955 has a 955 mm raceway, and C0a of 3,400 kN. The VSU250855 has an 855 mm raceway, and C0a of 3,050 kN, which is about 11% less static axial capacity. The VSU250955 is used when the load estimates are higher than the capacity of the 855 mm variant.

Q: What is the difference between VSU series 25 and series 20?

A: Series 25 has a section height of 63 mm compared to 56 mm for series 20, and fixing bores of 22 mm compared to 14 mm and provides almost twice the static axial capacity for a similar outer diameter. The VSU250955 is the 25 series for heavy-duty applications when the 20 series is load restricted.

Q: How can a slewing ring without gears drive?

A: No gear teeth on either ring Rotation by: external pinion on customer ring or machined OD, chain/belt drive, friction wheel or hydraulic/electric motor via gearbox.

Q: What grades and classifications of precision are there?

A: Radial clearance normal 0.03-0.13 mm. Available accuracy classes are P0, P6 and P5. Available on request in reduced clearance and preloaded versions.

Q: What is the re-lubrication period for heavy excavator service?

A: Re-lubrication periods vary on operation circumstances. A rule of thumb generally cited for the excavator’s swing system is every 100 working hours. For applications in high humidity or continuous rotation, automated lubrication systems are sometimes employed to provide appropriate grease in the raceway. Check with your equipment manufacturer for the proper interval.

Contact Us

For pricing, current stock availability, CAD drawings, or technical questions about VSU250955 Slewing Bearings, contact our team at mia@hgb-bearing.com.