239/500MB Double Row Spherical Roller Bearings, Symmetric 3 Ribs
The 239/500MB Double-row spherical roller bearings are suitable for heavy-load, impact, and eccentric conditions. Classic applications include vibrating screen exciters, crushers, fans, paper machine press rolls, mining conveyor equipment, and marine propulsion shafts.
The 239/500MB bearing is a Double row spherical roller bearings, symmetric 3 ribs with an inner diameter of 500 mm , an outer diameter of 670 mm, a width of 128 mm. GCr15, GCr15SiMn, SUJ2 rings, GCr15, SUJ2 rolling mlement. Its dynamic radial rated load is approximately 2599830 N, its static radial rated load is approximately 6299818 N. It uses CN standard radial clearance, OPEN type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
239/500MB bearings have the advantages of Self-aligning, extremely high load-bearing capacity, thinnest cross-section, low friction, suitable for confined spaces, and are therefore widely used in the Large crushers, mills, and rotary kilns.
| Part Number | 239/500MB |
| Bore Type | Z = Cylindrical bore |
| RIC | CN |
| Row | 2 |
| Bearing Type | Double row spherical roller bearings, symmetric 3 ribs |
| Manufacturer Part Code | 239/500MB |
| Equivalent | 239/500MB |
| Cage | MB = Solid brass cage, guided on inner ring |
| Measurement | Metric |
| Seal type | OPEN |
| d φ Inside [inch] | 19.685 |
| D Φ Outside [inch] | 26.378 |
| B Width [inch] | 5.039 |
| nB Reference speed (grease) [min–1] | 516 |
| nG Limiting speed (oil) [min–1] | 969 |
| Weight [kg] | 128.5 |
| r(min.) Chamfer [inch] | 0.197 |
| D1 [inch] | 24.382 |
| ds [inch] | 0.492 |
| ns [inch] | 0.925 |
| Cr Radial Dynamic [lbf] | 584441 |
| C0r Radial static [lbf] | 1416199 |
| Cur Radial Fatigue [lbf] | 92150 |
| Temperature - T(min)[°C] | -30 |
| Temperature - T(max)[°C] | +200 |
| Mounting dimensions | |
| da(min.) [inch] | 20.394 |
| Da(max.) [inch] | 25.669 |
| ra(max.) [mm] | 128.5 |
| Calculation coefficient | |
| e | 0.17 |
| Y0 | 3.81 |
| Y1 | 3.9 |
| Y2 | 5.81 |
The 239/500MB Double-row spherical roller bearings mainly consist of an inner ring, an outer ring, two rows of spherical rollers, a cage, and seals. The outer ring raceway has a spherical structure, while the inner ring has a double-row raceway. The rollers and raceways are logarithmically curved. The cage is typically made of stamped steel or machined brass.
Double-row spherical roller bearings possess excellent self-aligning properties, compensating for shaft deflection, installation errors, and misalignment. They can simultaneously withstand radial loads and bidirectional axial loads, exhibiting extremely high load-bearing capacity and strong impact resistance. Furthermore, the internal clearance can be optimized for vibration conditions, effectively reducing frictional temperature rise.
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