What is the equivalent of a 6311A-2Z-C3 bearing?

The 6311A-2Z-C3 is a 55×120×29mm deep groove ball bearing with verified equivalents across multiple brands: FAG 6311-2ZR-C3, NSK 6311ZZ C3E, NTN 6311ZZ/C3, Timken 6311-ZZ C3. All equivalents share the same bore, outer diameter, width, and load ratings.

What are the dimensions of a 6311A-2Z-C3 bearing?

The 6311A-2Z-C3 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 6311A-2Z-C3 with a FAG equivalent?

Yes. SKF and FAG bearings with the same ISO designation are dimensionally interchangeable. The 6311A-2Z-C3 (55×120×29mm) can be replaced with the equivalent FAG part number as long as the seal type (ZZ) and clearance class (C3) match. Always verify load ratings and speed limits for your specific application.

6311A-2Z-C3

ZZC3Deep Groove Ball BearingMedium Series

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

SKF6311-2Z C355 × 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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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 C3	ZZ	C3	Probable
FAG	6311-2ZR-C3	ZZ	C3	Probable
NSK	6311ZZ C3E	ZZ	C3	Verified
NTN	6311ZZ/C3	ZZ	C3	Probable
Timken	6311-ZZ C3	ZZ	C3	Probable

Legacy & Proprietary Numbers

SKF6311-2RS1/C3NSK6311C3EKOYO63112RSPEER6311-2RLDSTEYR6311A/2RS1/C3NTN6311LLURHP6311-2RSSNR6311NFBC6311PFEDERAL1311FLT6311NNWG6311.2ZZWZ6311-2RSFafnir311KMGM6311.2ZMRC311-SFederal1311FFHOOVER7311New Departure88211CITR620214FIAT73012085ROLLWAY6311NRROVER13/17ZIL120-1701190SKF6311-2RSJEMNSK6311CMKOYO6311C3PEER6311-2RLD-C3STEYR6311A/2Z/C3NTN6311LU

Show all 108 cross-references

RHP6311NSNR6311NJ30FBC6311PPFEDERAL1311FFLT6311NRNWG6311NZWZ6311NFafnir311KDMGM6311NMRC311-SFFFederal1311SFHOOVER7311GNew Departure88511SKF6311-2Z/C3NSK6311DDUKOYO6311DPEER6311-C3STEYR6311C4NTN6311NRRHP6311NRSNR6311NRFBC6311PSRFEDERAL1311FFFLT6311ZNRNWG6311ZZWZ6311-RSFafnir311KDDMGM6311ZMRC311-SZZSKF6311-2ZJEMNSK6311DDUC3EKOYO6311DDPEER6311-ZDSTEYR6311NRNTN6311ZRHP6311RSSNR6311ZFBC6311SRFEDERAL1311GFFLT6311ZZNWG6311ZNZWZ6311-ZSKF6311/C3NSK6311DUKOYO6311NPEER6311-ZD-C3STEYR6311ZNTN6311ZNRRHP6311ZSNR6311ZZSKF6311/C4NSK6311DUCMKOYO6311NRPEER6311-ZZDSTEYR6311Z/C3NTN6311ZZSKF6311JEMNSK6311MKOYO6311RSPEER6311-ZZD-C3STEYR6311ZNRSKF6311M/C3VL0241NSK6311NKOYO6311ZSKF6311NRNSK6311ZKOYO6311ZNRSKF6311NRJEMNSK6311ZCMKOYO6311ZZSKF6311-RS1NSK6311ZNRSKF6311-RSJEMNSK6311ZZSKF6311-ZSKF6311-Z/C3SKF6311-ZJEMSKF6311-ZNR

Technical Details & Applications

Specification variations and common equipment types.

Internal Clearance

Greater Than Normal (C3)

Increased radial internal clearance. Required when bearings operate at elevated temperatures or with tight shaft fits.

Temperature70-150°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

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