Model datasheet
6311 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 bearing specifications
| Parameter | Value |
|---|---|
| Model | 6311 |
| 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 | Open |
| Dynamic Load | 71.8 kN |
| Static Load | 45.5 kN |
| Speed Limit | 6500 RPM |
| Precision | P0 (ABEC-1) |
| Clearance | CN (Standard) |
6311 brand designation references
Interchange Numbers: 6311
Catalogue designations reviewed for this model include SKF 6311, FAG 6311, NSK 6311, NTN 6311, Timken 311.
These catalogue references have source records, but the complete suffix and operating requirement must still be confirmed.
| Brand | Brand designation | Reference status |
|---|---|---|
| SKF | 6311 | Source recorded SKF rolling bearing catalogue — 6311 · |
| FAG | 6311 | Source recorded Schaeffler FAG rolling bearing catalogue — 6311 · |
| NSK | 6311 | Source recorded NSK rolling bearing catalogue — 6311 · |
| NTN | 6311 | Source recorded NTN rolling bearing catalogue — 6311 · |
| Timken | 311 | Source recorded Timken bearing catalogue — 311 · |
Frequently asked questions about 6311
What does the open design mean on a 6311 bearing?
The 6311 (55mm x 120mm x 29mm) is supplied open — without seals or shields — so lubrication and relubrication come from the surrounding housing or an external system. Compare seal types before deciding on the replacement.
Which part numbers are equivalent to 6311?
Equivalent designations include 311 . These are brand-specific numbers for the same ISO boundary dimensions as the 6311 (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 come with C3 clearance?
This directory lists the 6311 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 is listed as a 55×120×29mm deep groove ball bearing in open configuration. Part of the 6300 series, the directory records chrome steel gcr15 and P0 (ABEC-1) precision grade for RFQ verification.
The 6311 uses the same part number designation across SKF, FAG, NSK, NTN, and Timken catalogs. This is a standardized deep groove ball bearing with industry-standard boundary dimensions. Confirm the housing style, shaft diameter, and seal type before ordering a replacement.
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
The 6311 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 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 | 50mm x 90mm x 20mm | Open | View specifications |
| 6310 | 50mm x 110mm x 27mm | Open | View specifications |
| 6011 | 55mm x 90mm x 18mm | Open | View specifications |
| 6211 | 55mm x 100mm x 21mm | Open | View specifications |
| 6012 | 60mm x 95mm x 18mm | Open | View specifications |
Fast bearing RFQ
Tell us what bearing you need.
A model number is enough to start. If the marking is unclear, send the dimensions, application, or a shared photo link in the message.
- Small repair quantities and mixed model lists
- Model, suffix, and replacement review
- Price, lead time, packing, and shipping details