21306 CY Bore 30 Mm, Pressed Brass Cage, Spherical Roller Bearings
The 21306 CY 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 21306 CY bearing is a Spherical roller bearings, double row with an inner diameter of 30 mm , an outer diameter of 72 mm, a width of 19 mm. GCr15SiMn rings, GCr15SiMn rolling mlement. It uses Normal standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
21306 CY bearings ( 30 mm x 72 mm x 19 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 | 21306 CY |
| Bearing Type | Spherical roller bearings, double row |
| Reference From | SKF 21306 CY |
| Cage | Y = Pressed brass cage, ring guided |
| Seal | Open |
| Internal clearance | Normal |
| Weight [lb] | 0.904 |
| Permissible angular misalignment | 2 degrees |
| Heat stabilization | 392 °F (200 °C) |
| Roller bearing type | Spherical |
| Lubrication | W33 = Annular groove and three lubrication holes in the outer ring |
| Bore Type | Z = cylindrical bore |
| Principal Dimensions | |
| Inside - d φ [inch] | 1.181 |
| Inside - d φ tolerance | -0.01 mm to 0 |
| Outside - D Φ [inch] | 2.835 |
| Outside - D Φ tolerance | -0.013 mm to 0 |
| Width - B [inch] | 0.748 |
| Width - B tolerance | -0.06 mm to 0 |
| d2 [inch] | 1.705 |
| D1 [inch] | 2.315 |
| r1,r2(min.) [inch] | 0.043 |
| Performance | |
| Dynamic Radial - Cr [lbf] | 1347 |
| Static Radial - C0r [lbf] | 13594 |
| Speed ratings (oil) - nG [rpm] | 9967 |
The 21306 CY 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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