VA 250309 N Four Point Contact Slewing Ring, External Teeth
The VA 250309 N Single-row four-point contact ball slewing bearings are widely used in rotational applications requiring the ability to withstand combined loads (axial force, radial force, and overturning moment) and demanding a compact structure and low self-weight, such as engineering machinery (truck cranes, excavators), wind power generation (yaw bearings), port machinery, photovoltaic tracking systems, robotics, and medical devices.
The VA 250309 N bearing is a Four point contact bearing, slewing ring, external teeth with an inner diameter of 235 mm , an outer diameter of 408.4 mm, a width of 60 mm. It typically uses P5, P6, P0 grade precision tolerances and 50Mn,42CrMo rings, GCr15 rolling mlement. It primarily bears axial, radial and tilting moment loads, Its dynamic radial rated load is approximately 232000 N, its static radial rated load is approximately 295000 N. Its dynamic axial rated load is approximately 255000 N, its static axial rated load is approximately 640000 N. sealed type, NBR (Nitrile Butadiene Rubber). together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: VA250309-N
VA 250309 N bearings ( 235 mm x 408.4 mm x 60 mm) have the advantages of Compact structure, lightweight, small footprint, high cost-performance ratio, and are therefore widely used in the Robots, construction machinery, wind turbines, radar antennas, and various rotary worktables.
| Part Number | VA 250309 N |
| Bearing Type | Four point contact bearing, slewing ring, external teeth |
| Series | VA |
| Equivalent | VA250309-N |
| Interchangeable | INA VA 250309 N |
| Load direction | axial, radial and tilting moment loads |
| Lubrication nipples | 4 taper type lubrication nipples, DIN 71412, arranged evenly about the circumference |
| Seal type | sealed |
| Seal Material | NBR (Nitrile Butadiene Rubber) |
| Rows NO. | One |
| m Weight [kg] | 29.5 |
| Performance Data | |
| Ca Dynamic Axial | 255000 N | 255.000 KN |
| C0a Static Axial | 640000 N | 640.000 KN |
| Cr Radial Dynamic | 232000 N | 232.000 KN |
| C0r Radial Static | 295000 N | 295.000 KN |
| Operating temperature - T(min) [°C] | -25 |
| Operating temperature - T(max) [°C] | 80 |
| Dimensions | |
| Da Φ Outside Diameter [mm] | 408.4 |
| di φ Bore Diameter [mm] | 235 |
| Di Inner diameter outer ring [mm] | 308 |
| DiZT Diameter centring outer ring [mm] | 310 |
| DiZT Tolerance [mm] | +IT8 |
| da Outside diameter inner ring [mm] | 310 |
| Height - H [mm] | 60 |
| h Height of individual ring [mm] | 52.5 |
| T Length centering inner ring [mm] | 3 |
| t Length centering inner ring [mm] | 8 |
| ha Width outer ring [mm] | 52.5 |
| hi Height of inner ring [mm] | 52.5 |
| Fixing holes | |
| La Pitchcircle diameter fixing holes outer ring [mm] | 359 |
| na Number of fixing holes in outer ring | 24 |
| Li Pitchcircle diameter fixing holes inner ring [mm] | 259 |
| ni Number of fixing holes in inner ring | 24 |
| dB Fixing bore [mm] | 13 |
| Fr zul Max Radial load fixing screws | 99100 N | 99.100 KN |
| Gearing | |
| Gearing type | N = Normalized gear teeth on bearing ring |
| Gear teeth type | external |
| Gear rings material | C45N or 42CrMo4V65 (suffix N) |
| b Width gearing [mm] | 52.5 |
| d0 Pitch circle diameter gearing [mm] | 400 |
| m Module of gearing [mm] | 5 |
| z Number of teeth | 80 |
| Fz norm Tooth force | 12900 N | 12.900 KN |
| Fz max Tooth force | 18800 N | 18.800 KN |
| Designation Breakdown |
The VA 250309 N Single-row four-point contact ball slewing bearings mainly consist of an inner ring, an outer ring, steel balls, spacers, and a sealing device. The raceways are peach-shaped or arc-shaped, and the steel balls form four-point contact with the inner and outer ring raceways. Gears can be integrated into the inner and outer rings.
Single-row four-point contact ball slewing bearings feature a low axial height and light weight due to their single-row structure. One bearing can simultaneously withstand axial loads, radial loads, and overturning moments. The four-point contact design provides high load-bearing capacity, good rigidity, and easy installation and maintenance.
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