21309 EK Spherical Roller Bearings, Stamped Steel Cages, Tapered Bore
The 21309 EK 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 21309 EK bearing is a Spherical roller bearings, double row with an inner diameter of 45 mm , an outer diameter of 100 mm, a width of 25 mm. High-carbon chromium steel rings, High-carbon chromium steel rolling mlement. Its dynamic radial rated load is approximately 128925 N, its static radial rated load is approximately 126826 N. It uses Normal standard radial clearance, open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
21309 EK bearings ( 45 mm x 100 mm x 25 mm) have the advantages of Self-aligning, high load-bearing capacity, impact resistant, and adaptable to heavy loads, and are therefore widely used in the Gearboxes, drive shafts, conveying equipment, general machinery.
| Part Number | 21309 EK |
| Manufacturer Part Code | 21309EK |
| Internal design | E = Optimized internal design for increased load carrying capacity, Flangeless inner ring and two stamped steel cages Annular groove and three lubrication holes in the outer ring, Guide ring centred on the inner ring |
| Bearing Type | Spherical roller bearings, double row |
| m Weight [lb] | 2.183 |
| Seal type | open |
| Series | 213..-EK |
| Cage | stamped steel cages |
| Bore Type | K = Tapered bore, taper 1:12 |
| Radial internal clearance | Normal |
| Units | Metric |
| Cr Dynamic Radial [lbf] | 28982 |
| C0r Static Radial [lbf] | 28510 |
| Pu Fatigue Radial [lbf] | 3061 |
| Operating temperature - T(min) [°C] | -30 |
| Operating temperature - T(max) [°C] | +200 |
| nB Speed ratings (grease) [rpm] | 6259 |
| nG Speed ratings (oil) [rpm] | 8449 |
| Heat stabilization | 392 °F (200 °C) |
| Dimension | |
| d φ Inside [inch] | 1.772 |
| D Φ Outside [inch] | 3.937 |
| B Width [inch] | 0.984 |
| b [inch] | 0.236 |
| K [inch] | 0.118 |
| d2 [inch] | 2.571 |
| D1 [inch] | 3.465 |
| ra(max.) Fillet [inch] | 0.059 |
| r1,r2(min.) Fillet [inch] | 0.059 |
| Angular misalignment | 1 degree |
| Abutment dimensions | |
| da(min.) [inch] | 2.126 |
| Da(max.) [inch] | 3.583 |
| Calculation factor | |
| e | 0.24 |
| Y1 | 2.8 |
| Y2 | 4.2 |
| Y0 | 2.8 |
The 21309 EK 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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