6311-C4
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What 6311-C4 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 |
C4 |
Internal clearance | C4: radial internal clearance greater than C3 |
Read from the ISO / ABMA numbering rules and the makers' published suffix conventions. Decode any other number with the bearing number decoder.
6311-C4 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 | Open (no seals or shields) | Stated by the designation | |
| Internal clearance | C4 (greater than C3) | 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 C4 | Brand suffix convention for this ISO size |
| TIMKEN | 6311 C4 | Brand suffix convention for this ISO size |
| FAG | 6311 C4 | Brand suffix convention for this ISO size |
| NSK | 6311 C4 | Brand suffix convention for this ISO size |
| NTN | 6311 C4 | Brand suffix convention for this ISO size |
| KOYO | 6311 C4 | Brand suffix convention for this ISO size |
| NACHI | 6311 C4 | 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-C4 is a deep groove ball bearing, 55 mm bore × 120 mm OD × 29 mm wide (2.1654 × 4.7244 × 1.1417 in). It has no seals or shields (open) and C4 internal clearance. Other makers sell the same size as SKF 6311 C4, TIMKEN 6311 C4, FAG 6311 C4, NSK 6311 C4.
The 6311-C4 is a deep groove ball bearing with a 55mm bore diameter, 120mm outside diameter, and 29mm width. It features C4 radial internal clearance, which is greater than C3 and provides additional expansion space for applications involving higher operating temperatures or interference fits.
