Model datasheet
6311-2RS Deep Groove Ball Bearing 55x120x29mm
Confirm the model number, dimensions, suffix, and replacement notes before sending a quotation request for repair or MRO sourcing.
Verified directory reference: Specifications have been reviewed, but the complete suffix and current order requirement must still be confirmed before purchase.
6311-2RS bearing specifications
| Parameter | Value |
|---|---|
| Model | 6311-2RS |
| Category | Deep Groove Ball Bearing |
| Series | 6300 Series |
| Inner Diameter (ID) | 55 mm |
| Outer Diameter (OD) | 120 mm |
| Width | 29 mm |
| Material | Chrome Steel GCr15 |
| Closure | Rubber Sealed (2RS) |
| Dynamic Load | 71.8 kN |
| Static Load | 45.5 kN |
| Speed Limit | 6500 RPM |
| Precision | P0 (ABEC-1) |
| Clearance | CN (Standard) |
6311-2RS brand designation references
Interchange Numbers: 6311LLU · 6311DDU · 6311VV · 6311-2NSL · 6311.2RSR · 6311EE · 6311 2RU
Catalogue designations reviewed for this model include SKF 6311-2RS1, FAG 6311-2RSR, NSK 6311DDU, NTN 6311LLU, Timken 311PP.
These catalogue references have source records, but the complete suffix and operating requirement must still be confirmed.
| Brand | Brand designation | Reference status |
|---|---|---|
| SKF | 6311-2RS1 | Source recorded SKF rolling bearing catalogue — 6311-2RS1 · |
| FAG | 6311-2RSR | Source recorded Schaeffler FAG rolling bearing catalogue — 6311-2RSR · |
| NSK | 6311DDU | Source recorded NSK rolling bearing catalogue — 6311DDU · |
| NTN | 6311LLU | Source recorded NTN rolling bearing catalogue — 6311LLU · |
| Timken | 311PP | Source recorded Timken bearing catalogue — 311PP · |
Frequently asked questions about 6311-2RS
What does the 2RS rubber-seal design mean on a 6311-2RS bearing?
The 6311-2RS (55mm x 120mm x 29mm) is sealed on both sides with rubber (NBR) contact seals, so the grease is retained and contamination is kept out. A 2RS bearing should not be cleaned or relubricated in service. Compare seal types before deciding on the replacement.
Which part numbers are equivalent to 6311-2RS?
Equivalent designations include 6311-2RS1, 6311-2RSR, 6311DDU, 6311LLU, 311PP, 6311VV, 6311-2NSL, 6311.2RSR , and others. These are brand-specific numbers for the same ISO boundary dimensions as the 6311-2RS (55mm x 120mm x 29mm). The basic number matching does not confirm the complete specification — compare seal type, clearance, precision, cage, and lubrication suffix before ordering.
Does the 6311-2RS come with C3 clearance?
This directory lists the 6311-2RS with CN (Standard). C3 (increased internal clearance) versions are common for higher operating temperatures, higher speeds, or press-fit arrangements — specify the required clearance on your RFQ so the quotation matches the application. Read the clearance guide.
The 6311-2RS is listed as a 55×120×29mm deep groove ball bearing in double rubber sealed configuration. Part of the 6300 series, the directory records chrome steel gcr15 and P0 (ABEC-1) precision grade for RFQ verification.
The 6311-2RS bearing cross-references to SKF 6311-2RS1, FAG 6311-2RSR, NSK 6311DDU and NTN 6311LLU. This means you can replace an SKF equivalent, FAG alternative, NSK cross reference, or NTN interchange part with the same ISO boundary dimensions. Compare the full specification table and designation suffixes before ordering, especially the seal type (2RS vs ZZ) and internal clearance (C3 vs CN).
About the 6300 Series
The 6300 series is a medium duty deep groove ball bearing with higher load ratings than the 6200 series. With a thicker cross-section (larger OD and width for the same bore), these bearings handle heavier radial loads and are commonly found in larger motor frames and industrial gearboxes.
Common Applications
- Heavy Machinery
- Mining Equipment
- Steel Mills
- Industrial Gearboxes
Common applications for 6311-2RS
The 6311-2RS is a common replacement candidate in the following equipment. Open the application guide to confirm the checks that apply to your machine before ordering:
Compare 6311-2RS with nearby sizes
These models are the closest sizes in the same bearing family. They are not interchangeable — confirm the bore, outside diameter, and width before replacing the existing part.
| Model | Dimensions | Closure | Action |
|---|---|---|---|
| 6210-2RS | 50mm x 90mm x 20mm | Rubber Sealed (2RS) | View specifications |
| 6310-2RS | 50mm x 110mm x 27mm | Rubber Sealed (2RS) | View specifications |
| 6011-2RS | 55mm x 90mm x 18mm | Rubber Sealed (2RS) | View specifications |
| 6211-2RS | 55mm x 100mm x 21mm | Rubber Sealed (2RS) | View specifications |
| 6012-2RS | 60mm x 95mm x 18mm | Rubber Sealed (2RS) | View specifications |
Fast bearing RFQ
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