NSK 1211 Self Aligning Ball Bearing, Cylindrical Bore 55 x 100 x 21 mm
Available
This NSK range covers 2 double row self-aligning ball bearings with a cylindrical bore: the 1211 and 1220, from 55 to 100 mm bore and 100 to 180 mm outer diameter. Select the size from the drop-down: each size has its own bearing number, dimensions, load ratings and limiting speeds in the Model Details.
Self aligning ball bearings have a spherical outer ring raceway, so the inner ring, balls and cage can swing to take up small angular misalignment between shaft and housing. They suit long shafts, shafts that deflect under load and housings that cannot be bored in line. The cylindrical bore suits a conventional press or slip fit on a plain shaft.
Where this product is used
- Conveyor pulleys and idler rolls
- Fans, blowers and agricultural machinery
- Line shafting and general industrial machinery where the shaft or housing may deflect
Features
- Double row design with a spherical outer ring raceway, so the bearing tolerates small angular misalignment between shaft and housing
- Cylindrical bore for a conventional press or slip fit on a plain shaft
- Basic dynamic load ratings 29.6 to 76.5 kN and static load ratings 10 to 29.7 kN across the range
- Limiting speeds of 3,200 to 6,000 rpm on grease and 3,800 to 7,100 rpm on oil, depending on size
Key specifications
| Specification | Detail |
|---|---|
| Type | Double row self-aligning ball bearing |
| Bearing numbers | 2: 1211 and 1220 |
| Bore d | 55 to 100 mm |
| Outer diameter D | 100 to 180 mm |
| Width B | 21 to 34 mm |
| Bore type | Cylindrical bore |
| Radial internal clearance | Normal (CN) |
| Basic dynamic load rating Cr | 29.6 to 76.5 kN |
| Basic static load rating Cor | 10 to 29.7 kN |
Available sizes
| Model | Size d x D x B (mm) | Cr (kN) | Cor (kN) | Limiting speed, grease (rpm) | Limiting speed, oil (rpm) | Mass (kg) |
|---|---|---|---|---|---|---|
| 1211 | 55 x 100 x 21 | 29.6 | 10 | 6,000 | 7,100 | 0.705 |
| 1220 | 100 x 180 x 34 | 76.5 | 29.7 | 3,200 | 3,800 | 3.7 |
Selecting the right option
A cylindrical bore suits a plain shaft with a conventional press or slip fit, and is the simpler choice where the shaft can be machined to size.
Fitting and use
Check the load and speed against the figures for your size before ordering and apply a suitable safety factor. Self aligning bearings carry radial load and a light axial load in either direction, and the misalignment they accept is small, so heavy axial loads and large deflections should be checked with AIMS before ordering.
Fit the bearing by pressing on the ring that is being fitted, never through the balls. On a tapered bore, drive the inner ring up the taper (or tighten the sleeve) while checking the internal clearance, and stop at the clearance reduction the application calls for.
Related products
Also available from NSK: the tapered bore range and the same cylindrical bore range with C3 clearance.
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55 x 100 x 21mm bearing
Model Number: 1211/NSK
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100 x 180 x 34mm bearing
Model Number: 1220/NSK
