6311-Z
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What 6311-Z 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 |
Z |
Closure | Metal shield, one side |
Read from the ISO / ABMA numbering rules and the makers' published suffix conventions. Decode any other number with the bearing number decoder.
6311-Z 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 | Metal shield, one side | 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-ZJ | SKF Master Interchange |
| FAG | 6311Z | SKF Master Interchange |
| NTN | 6311Z | SKF Master Interchange |
| KOYO | 6311Z | SKF Master Interchange |
| NACHI | 6311Z | SKF Master Interchange |
Equivalents are dimensional and closure-for-closure: same bore, outside diameter, width, seals or shields and internal clearance. Bearing interchange tables
6311-Z is a deep groove ball bearing, 55 mm bore × 120 mm OD × 29 mm wide (2.1654 × 4.7244 × 1.1417 in). It has a metal shield on one side. Published interchange tables list it as equivalent to SKF 6311-ZJ, FAG 6311Z, NTN 6311Z, KOYO 6311Z.
The 6311-Z is a single-shielded deep groove ball bearing with a 55mm bore diameter, 120mm outside diameter, and 29mm width. The metal shield on one side protects against contamination while allowing for easier lubrication access on the open side.
