6311-2RS
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What 6311-2RS means
| Code | Position | Meaning |
|---|---|---|
6 |
Type | Deep groove ball bearing |
3 |
Diameter series | Diameter series 3 (medium): fixes OD and width for the bore (ISO 15) |
11 |
Bore | Bore code 11 × 5 = 55 mm |
2RS |
Closure | Contact rubber seals, both sides |
Read from the ISO / ABMA numbering rules and the makers' published suffix conventions. Decode any other number with the bearing number decoder.
6311-2RS 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 | ISO table for this designation, confirmed by supplier data |
| Width (B) | 29 mm | 1.1417 in | ISO table for this designation, confirmed by supplier data |
| Bearing type | Deep groove ball bearing | Stated by the designation | |
| Seals / shields | Contact rubber seals, both sides | Stated by the designation | |
| Internal clearance | Normal (CN): no clearance code in the designation | 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 |
|---|---|---|
| SKF | 6311 2RSH | Brand suffix convention for this ISO size |
| TIMKEN | 6311 2RS | Brand suffix convention for this ISO size |
| FAG | 6311 2RSR | Brand suffix convention for this ISO size |
| NSK | 6311 DDU | Brand suffix convention for this ISO size |
| NTN | 6311 LLU | Brand suffix convention for this ISO size |
| KOYO | 6311 2RS | Brand suffix convention for this ISO size |
| NACHI | 6311 2NSE | Brand suffix convention for this ISO size |
Equivalents are dimensional and closure-for-closure: same bore, outside diameter, width, seals or shields and internal clearance. Bearing interchange tables
6311-2RS is a deep groove ball bearing, 55 mm bore × 120 mm OD × 29 mm wide (2.1654 × 4.7244 × 1.1417 in). It has rubber contact seals on both sides. Other makers sell the same size as SKF 6311 2RSH, TIMKEN 6311 2RS, FAG 6311 2RSR, NSK 6311 DDU.
The 6311-2RS is a deep groove ball bearing with 55mm bore diameter, 120mm outside diameter, and 29mm width. It features contact rubber seals on both sides (2RS suffix) to protect against contaminants and retain lubrication in demanding environments.
