What is the equivalent of a 6311-2ZR bearing?

The 6311-2ZR is a 55×120×29mm deep groove ball bearing with verified equivalents across multiple brands: FAG 6311-2ZR, NSK 6311ZZ, NTN 6311ZZ, Timken 6311-ZZ. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 6311-2ZR bearing?

The 6311-2ZR bearing has a bore diameter of 55mm, outer diameter of 120mm, and width of 29mm. It has a dynamic load rating of 74.1 kN, static load rating of 45 kN, and weighs 1340g. Maximum speed with grease lubrication is 8,000 rpm.

Can I replace a SKF 6311-2ZR with a FAG equivalent?

Yes. SKF and FAG bearings with the same ISO designation are dimensionally interchangeable. The 6311-2ZR (55×120×29mm) can be replaced with the equivalent FAG part number as long as the seal type (ZZ) and clearance class (CN) match. Always verify load ratings and speed limits for your specific application.

6311-2ZR

ZZCNDeep Groove Ball BearingVerified matchMedium Series

Higher load capacity than the 6200 series for the same bore size. Used where heavier radial loads are expected.

55 × 120 × 29mm

Cr 74.1 kN / C₀r 45 kN

8,000 rpm (grease)

SKF6311-2Z55 × 120 × 29mm

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Match Details

The specifications and details for why this match is correct.

Specifications

Bore diameter (d)	55 mm
Outer diameter (D)	120 mm
Width (B)	29 mm
Dynamic load rating (C)	74.1 kN
Static load rating (C₀)	45 kN
Weight	1340 g
Max speed (grease)	8,000 rpm
Max speed (oil)	12,000 rpm

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Why This Match Is Correct

✓Exact dimensional match (bore, OD, width)

✓Load ratings within tolerance

✓Seal type verified via manufacturer tables

✓Speed rating compatible

Cross-References

Every way this part is identified across brands and catalogs.

Tier-1 Brand Equivalents

Brand	Part Number	Seal	Clearance	Status
SKF	6311-2Z	ZZ	CN	Verified
FAG	6311-2ZR	ZZ	CN	Current
NSK	6311ZZ	ZZ	CN	Verified
NTN	6311ZZ	ZZ	CN	Verified
Timken	6311-ZZ	ZZ	CN	Verified

Legacy & Proprietary Numbers

SKF6311-2RS1/C3NSK6311C3EKOYO63112RSPEER6311-2RLDSTEYR6311A/2RS1/C3NTN6311LLURHP6311-2RSFBC6311PFEDERAL1311NWG6311.2ZSNR6311NZWZ6311-2RSFafnir311KFLT6311NMGM6311.2ZMRC311-SFederal1311FFHOOVER7311New Departure88211CITR620214FIAT73012085ROLLWAY6311NRROVER13/17ZIL120-1701190SKF6311-2RSJEMNSK6311CMKOYO6311C3PEER6311-2RLD-C3STEYR6311A/2Z/C3NTN6311LU

Show all 103 cross-references

RHP6311NFBC6311PPFEDERAL1311FNWG6311NSNR6311NJ30ZWZ6311NFafnir311KDFLT6311NRMGM6311NMRC311-SFFFederal1311SFHOOVER7311GNew Departure88511SKF6311-2Z/C3NSK6311DDUKOYO6311DPEER6311-C3STEYR6311C4NTN6311NRRHP6311NRFBC6311PSRFEDERAL1311FFNWG6311ZSNR6311NRZWZ6311-RSFafnir311KDDFLT6311ZNRMGM6311ZMRC311-SZZSKF6311-2ZJEMNSK6311DDUC3EKOYO6311DDPEER6311-ZDSTEYR6311NRNTN6311ZRHP6311RSFBC6311SRFEDERAL1311GFNWG6311ZNSNR6311ZZWZ6311-ZSKF6311/C3NSK6311DUKOYO6311NPEER6311-ZD-C3STEYR6311ZNTN6311ZNRRHP6311ZSKF6311/C4NSK6311DUCMKOYO6311NRPEER6311-ZZDSTEYR6311Z/C3SKF6311JEMNSK6311MKOYO6311RSPEER6311-ZZD-C3STEYR6311ZNRSKF6311M/C3VL0241NSK6311NKOYO6311ZSKF6311NRNSK6311ZKOYO6311ZNRSKF6311NRJEMNSK6311ZCMSKF6311-RS1NSK6311ZNRSKF6311-RSJEMSKF6311-ZSKF6311-Z/C3SKF6311-ZJEMSKF6311-ZNR

Technical Details & Applications

Specification variations and common equipment types.

Internal Clearance

Normal Clearance (CN)

Standard radial internal clearance. Suitable for most applications under normal operating conditions.

TemperatureUp to ~70°C operating temperature

Seal Type

Metal Shielded (ZZ / 2Z)

Metal shields on both sides. Moderate protection from dust and debris. Pre-lubricated with grease.

Avoid forHarsh environments with heavy moisture, chemicals, or fine dust ingress.

Examples

Electric motors
Fans and blowers
Power tools
HVAC equipment

Where This Bearing Is Used

Electric motorsPumps and compressorsConveyor rollersAgricultural machineryFans and blowersGearboxesPower transmission equipmentWashing machinesPrinting pressesHVACAutomotive alternators and A/C compressors

Alternative Parts

Options if this exact part isn't what you need.

Same Geometry, Different Configuration

SKF Part Number	Seal Type	Clearance
6311	Open (No Seal)	CN
6311 C3	Open (No Seal)	C3
6311-2Z	ZZ	CN
6311-2Z C3	ZZ	C3
6311-2RS1	2RS	CN
6311-2RS1 C3	2RS	C3

Related Bearings

Adjacent sizes and cross-series bearings from our catalog.