21308 Bearing
Spherical roller bearing
- Bore d40 mm
- Outer dia. D90 mm
- Width B23 mm
- Weight≈ 0.69 kg
Heavy loads and misalignment: conveyors, crushers, vibrating screens, mining and marine equipment.
Technical data
| Bearing designation | 21308 |
|---|---|
| Type | Spherical roller bearing |
| Bore d | 40 mm |
| Outer dia. D | 90 mm |
| Width B | 23 mm |
| Weight | ≈ 0.69 kg |
Dimensions are standard catalogue values; the weight is an approximate calculation. Please confirm before ordering.
Common suffixes for 21308
| 21308 E | Reinforced internal design (higher load capacity) |
|---|---|
| 21308 EK | Reinforced internal design (higher load capacity) · Tapered bore, taper 1:12 |
| 21308 CC | Spherical roller internal design (symmetrical rollers, steel cage) |
| 21308 CCK | Spherical roller internal design (symmetrical rollers, steel cage) · Tapered bore, taper 1:12 |
| 21308 CA | Spherical roller internal design (brass cage) |
| 21308 CAK | Spherical roller internal design (brass cage) · Tapered bore, taper 1:12 |
| 21308 CC W33 C3 | CC internal design; lubrication groove and holes in the outer ring (W33) · Radial clearance larger than normal (for higher operating temperatures) |
| 21308 CAK W33 C3 | Spherical roller internal design (brass cage) · Tapered bore, taper 1:12 · Lubrication groove and 3 lubrication holes in the outer ring · Radial clearance larger than normal (for higher operating temperatures) |
| 21308 E C3 | Reinforced internal design (higher load capacity) · Radial clearance larger than normal (for higher operating temperatures) |
Click a designation to open it in the bearing finder. Suffix usage can differ slightly between brands.
Matching seal (radial shaft seal)
40 × 90 × 10 mm
Seal weight: ≈ 0.055 kg
Other common widths: 40 × 90 × 8 mm, 40 × 90 × 12 mm
The seal's inner diameter matches the shaft (40 mm) and its outer diameter matches the housing bore (90 mm); the width depends on the space in the housing. NBR (double lip, TC type) is recommended for general use and FKM (Viton) for high temperatures.
Quote for bearing and sealAll seal sizes and matching bearings →
Matching sleeve
H 308 · shaft 35 mm
Adapter sleeve H 308: shaft diameter 35 mm, bearing bore 40 mm, width 36 mm. Used with lock nut KM8 and lock washer MB8.
H 308 set weight (incl. lock nut and lock washer): ≈ 0.19 kg
Withdrawal sleeve AH 308: shaft diameter 35 mm, width 29 mm.
AH 308 weight: ≈ 0.072 kg
A sleeve mounts a tapered-bore bearing on a plain cylindrical shaft and bridges the difference between the bearing bore and the shaft diameter.
Use with a sleeve requires the tapered-bore version of the bearing: 21308 K.
Quote for bearing and sleeve