21311
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What 21311 means
| Code | Position | Meaning |
|---|---|---|
2 |
Type | Spherical roller bearing |
1 |
Width series | Width series 1 |
3 |
Diameter series | Diameter series 3 (medium) |
11 |
Bore | Bore code 11 × 5 = 55 mm |
Read from the ISO / ABMA numbering rules and the makers' published suffix conventions. Decode any other number with the bearing number decoder.
21311 specifications
| Specification | Metric | Inch | Basis |
|---|---|---|---|
| Bore (d) | 55 mm | 2.1654 in | ISO table for this designation, confirmed by supplier data |
| Outside diameter (D) | 120 mm | 4.7244 in | Supplier catalogue listing |
| Width (B) | 29 mm | 1.1417 in | Supplier catalogue listing |
| Bearing type | Spherical roller bearing | Stated by the designation | |
| Seals / shields | Open (no seals or shields) | Stated by the designation | |
| Internal clearance | Normal (CN): no clearance code in the designation | Stated by the designation | |
| Bore | Cylindrical (straight) bore | Stated by the designation | |
| Tolerance class | Normal (ISO P0 / ABEC 1): no tolerance-class code | Stated by the designation | |
Equivalent to / interchanges with
| Brand | Part number | Basis |
|---|---|---|
| TIMKEN | 21311E | Timken Interchange Guide |
Equivalents are dimensional and closure-for-closure: same bore, outside diameter, width, seals or shields and internal clearance. Bearing interchange tables
21311 is a spherical roller bearing, 55 mm bore × 120 mm OD × 29 mm wide (2.1654 × 4.7244 × 1.1417 in). Published interchange tables list it as equivalent to TIMKEN 21311E.
The 21311 is a spherical roller bearing with a 55mm bore diameter, 120mm outer diameter, and 29mm width. Spherical roller bearings feature barrel-shaped rollers running on a spherical outer ring raceway, providing self-aligning capability to compensate for shaft deflection and misalignment.
