VSI200644-N Slewing Bearings
Gear: Internal gear, module m6 / 93 teeth, pitch circle d0 per medias official data
Dimensions: bore 546 mm × OD 716 mm × height 56 mm, weight 49.11 kg (Schaeffler medias official)
Load capacity: dynamic axial Ca = 162 kN, static axial C0a = 1,040 kN, dynamic radial Cr = 147 kN, static radial C0r = 475 kN
Tooth force Fz max = 35.0 kN (per medias data)
Max. radial load on fixing screws Fr zul = 148.7 kN (friction-locking mount)
Clearance spec: Standard_SL: 0–0.3 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 VSI Standard 20 family across the 414 → 1094 (or 755 → 1055) raceway range
Primary application: Cranes and Lifting Platforms (mid-size mobile crane)
- Product Description
VSI200644-N Slewing Bearings — INA VSI Standard 20 Internal Gear Four-Point Contact Ball Slewing Ring
The VSI200644-N Slewing Bearings belong to the INA VSI Standard 20 series — a single-row, four-point contact ball slewing ring with an internal gear, 644 mm raceway diameter, 546 mm bore, 716 mm outside diameter, 56 mm section height, and a weight of 49.11 kg. With a static axial load capacity of 1,040 kN and an m6/z93 internal gear, this ring is designed for mid-size mobile cranes, excavators, and other heavy load-rotation excavator where a compact cross-section matters.
Full Technical Specifications
Parameter | Value |
Model | VSI200644-N |
Raceway Diameter (DL) | 644 mm |
Inner Ring Bore (di) | 546 mm |
Outside Diameter (Da) | 716 mm |
Total Height (H) | 56 mm |
Weight | 49.11 kg |
Gear Module (m) | 6 mm |
Number of Teeth (z) | 93 |
Gear Pitch Circle (d0) | 558 mm |
Dynamic Axial Load (Ca) | 162 kN |
Static Axial Load (C0a) | 1,040 kN |
Dynamic Radial Load (Cr) | 147 kN |
Static Radial Load (C0r) | 475 kN |
Max. Radial Load on Fixing Screws (Fr zul) | 148,700 N |
Outer Bolt Circle (La) / Qty | 690 mm / 36 |
Inner Bolt Circle (Li) / Qty | 605 mm / 36 |
Radial Clearance | Standard SL: 0–0.3 mm |
Operating Temperature | −25°C to +80°C |
Ring Material | 50Mn / 42CrMo4 |
Ball Material | GCr15 |
Seal Type | Double-lip NBR |
Precision Class | P0 / P6 / P5 |
Structure | Single-row four-point contact ball |
Design Features
Four-Point Contact Ball Structure
A single ball row carries axial, radial, and tilting moment loads simultaneously. This allows the ring to handle combined loads within a 56 mm section height — useful in crane slewing sections where axial space is limited.
Internal Gear with Normalized (N) Profile
The pinion meshes inside the ring bore rather than around the outside. This keeps the drive assembly compact and positions the gear teeth away from external debris — a practical consideration for excavator used in construction or mining environments.
Static Load Capacity at This Raceway Band
The C0a of 1,040 kN at the 644 mm raceway compares to 870 kN for the VSI200544-N (per Schaeffler medias catalogue data) — both at 56 mm section height. If an application has outgrown the 544 mm band's static capacity, the 644-N shares the same series-20 bolt envelope, making dimensional interchange feasible.
Ring and Ball Materials
VSI200644-N Slewing Bearings are produced from 50Mn or 42CrMo4 alloy steel with induction-hardened raceways. GCr15 bearing-grade balls and double-lip NBR seals are fitted as standard for the −25°C to +80°C operating range.
Bolt Pattern and Mounting Compatibility
36 holes at a 690 mm outer bolt circle and 36 holes at a 605 mm inner bolt circle follow the VSI Standard 20 family envelope. This means the VSI200644-N shares bolt layout with other bearings in the same series, which simplifies cross-platform interchangeability.
Application Scenarios
The main use is for the medium sized mobile cranes. The m6/z93 internal gear and the 36-bolt friction mount rated to 148,700 N radial offers the fastening capacity that these machines demand for the driving torques associated with a higher slewing diameter.
The static axial capacity of 1,040 kN is beneficial for excavators in the 20 to 30 tonne class where shock loads in digging must be safely absorbed at the slewing bearing.
This ring may be used by yaw systems of wind turbines working outside all year throughout the whole temperature range. Sealed four-point design retains lubrication between service intervals.
This ring offers rotary indexing tables and turntables that need a central through-bore for cables or hydraulic lines with 546 mm of clear bore diameter.
This ring design is also ideal for applications such as internal pinion clearance-controlled rotating radar, antenna and solar tracker platforms.
About Heng Guan Bearing
Luoyang Heng Guan Bearing Technology Co., Ltd. manufactures slewing bearings (diameter 50 mm to 10,000 mm). Available in precision classes P0, P5, P6 and P4. The manufacturing equipment comprises CNC vertical lathe, CNC quenching machine, CNC gear shaper, machining center, grinding machine, big gear hobbing machine etc.
Quality verification is carried out using coordinate measuring equipment, vibration testers and life testing machines. Traceability is maintained from raw material to completed product.
OEM and ODM orders are welcome, including reverse mapping of existing components, and non-standard machining of big gears, ring gears, Shafts and couplings. An engineering confirmation may be provided within 24 hours after a request. NB: 3D drawings are not included as a normal output.
Products are sent to consumers in the United States, Germany, United Kingdom, Italy, Australia, Russia, Norway, the Middle East and Southeast Asia and other regions. MOQ 1 item.
FAQ
Q: What are the main dimensions of the VSI200644-N?
A: 546 mm bore, 716 mm outside diameter, 56 mm height, 644 mm raceway diameter, 49.11 kg.
Q: What are the gear specifications?
A: Internal gear, module 6, 93 teeth, pitch circle 558 mm, normalized (N) profile. Peak tooth force is 35.0 kN per Schaeffler medias catalogue data.
Q: How does the VSI200644-N compare to the VSI200544-N?
A: Both share a 56 mm section height and the series-20 bolt envelope. The 644-N raceway is 644 mm with C0a 1,040 kN and m6/z93; the 544-N raceway is 544 mm with C0a 870 kN and m6/z76. Bore and OD differ accordingly (546 × 716 mm vs. 444 × 616 mm).
Q: What clearance and precision options are available?
A: Standard radial clearance is 0–0.3 mm. Precision classes P0, P6, and P5 are available. Reduced-clearance variants can be discussed at inquiry.
Q: Can this bearing operate below 0°C?
A: Yes. The rated operating range is −25°C to +80°C with standard double-lip NBR seals.
Q: What is the MOQ?
A: MOQ is 1 piece.
Contact Us
To request pricing or confirm availability for VSI200644-N Slewing Bearings, Contact Us at mia@hgb-bearing.com. Engineering confirmation is typically available within 24 hours.
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