239/670BKMB Double Row Spherical Roller Bearings, Main Dimensions To DIN 635-2
The 239/670BKMB 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 239/670BKMB bearing is a Double row spherical roller bearings, main dimensions to DIN 635-2 with an inner diameter of 670 mm , an outer diameter of 900 mm, a width of 170 mm. GCr15, GCr15SiMn, SUJ2 rings, GCr15, SUJ2 rolling mlement. Its dynamic radial rated load is approximately 4299834 N, its static radial rated load is approximately 10599838 N. It uses CN standard radial clearance, OPEN type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
239/670BKMB bearings ( 670 mm x 900 mm x 170 mm) 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 | 239/670BKMB |
| Design Type | B = with fixed central rib |
| Bore Type | K = Tapered bore (taper 1:12) |
| RIC | CN |
| Row | 2 |
| Adapter sleeve | H39/670-HG |
| Bearing Type | Double row spherical roller bearings, main dimensions to DIN 635-2 |
| Manufacturer Part Code | 239/670BK.MB |
| Equivalent | 239/670BK.MB |
| Withdrawal sleeve | AH39/670-H |
| Cage | MB = Solid brass cage, guided on inner ring |
| Measurement | Metric |
| Seal type | OPEN |
| Relubrication | Standard |
| d φ Inside [inch] | 26.378 |
| D Φ Outside [inch] | 35.433 |
| B Width [inch] | 6.693 |
| nB Reference speed (grease) [min–1] | 354 |
| nG Limiting speed (oil) [min–1] | 685 |
| Weight [kg] | 307 |
| r(min.) Chamfer [inch] | 0.236 |
| D1 [inch] | 32.736 |
| ds [inch] | 0.492 |
| ns [inch] | 0.925 |
| Cr Radial Dynamic [lbf] | 966602 |
| C0r Radial static [lbf] | 2382843 |
| Cur Radial Fatigue [lbf] | 170832 |
| Temperature - T(min)[°C] | -30 |
| Temperature - T(max)[°C] | +200 |
| Mounting dimensions | |
| da(min.) [inch] | 27.283 |
| da(max.) [inch] | 28.740 |
| Da(max.) [inch] | 34.527 |
| db(min.) [inch] | 27.126 |
| Ba(min.) [inch] | 0.787 |
| ra(max.) [mm] | 307 |
| Calculation coefficient | |
| e | 0.17 |
| Y0 | 3.86 |
| Y1 | 3.95 |
| Y2 | 5.88 |
The 239/670BKMB 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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