FAG 6311-2RSR-C3 55x120x29 Single Row Deep Groove Ball Bearing

FAG 6311-2RSR-C3 55x120x29 Single Row Deep Groove Ball Bearing

FAG 6311-2RSR-C3 is a single-row deep groove ball bearing with dimensions of 55x120x29 mm. The bore diameter d is 55 mm, outside diameter D is 120 mm and width B is 29 mm. The 2RSR design uses contact seals on both sides, while the C3 suffix identifies radial internal clearance greater than Normal.

FAG 6311-2RSR-C3 - Characteristics

The 6311-2RSR-C3 uses a single row of balls running between deep raceways in the inner and outer rings. This geometry primarily accommodates radial loads, while also allowing axial loads to be supported in both directions.

The bearing is non-separable. Its sealed configuration helps retain lubricant within the bearing and restrict contamination from reaching the rolling elements and raceways.

FAG 6311-2RSR-C3 Dimensions

d - Bore Diameter: 55 mm
D - Outside Diameter: 120 mm
B - Width: 29 mm
Dimensions: 55x120x29 mm
Mass: approximately 1.38 kg

For this bearing type, the third dimension in 55x120x29 mm correctly represents B, the bearing width.

Bearing Construction

FAG 6311-2RSR-C3 is a single-row, non-separable deep groove ball bearing with a cylindrical bore.

The balls operate between deep inner and outer ring raceways. This raceway geometry provides radial load capacity while also enabling the bearing to accommodate axial forces in both directions.

Technical data for this reference specify a steel cage.

What Does 2RSR Mean?

The FAG suffix 2RSR identifies a bearing fitted with contact seals on both sides.

These seals form a barrier between the internal rolling system and the external environment. They help retain the lubricant inside the bearing while restricting the ingress of contaminants.

The commercial designation FAG 6311 2RS should therefore be technically associated with the manufacturer's more precise 6311-2RSR designation.

What Does C3 Mean?

C3 means radial internal clearance greater than Normal.

C3 is an internal clearance classification. It does not indicate a higher accuracy class, higher material quality or automatically increased load capacity.

Greater initial radial clearance may be required where interference fits or thermal conditions reduce the available clearance after installation or during operation. The correct clearance group should therefore be selected according to the complete bearing arrangement.

Radial and Axial Loads

The deep groove geometry of FAG 6311-2RSR-C3 is primarily designed to accommodate radial loads. It can also accommodate axial loads acting in either direction.

Actual bearing suitability depends on load magnitude and direction, rotational speed, shaft and housing fits, operating temperature, lubrication conditions and required service life.

The presence of C3 clearance should therefore be considered together with the operating conditions rather than treated as a universally preferable bearing specification.

6311-2RSR-C3 vs Other 6311 Variants

Several 6311 bearing variants share the same 55x120x29 mm boundary dimensions.

The complete designation identifies the actual configuration:

6311: bearing series and size
2RSR: contact seals on both sides
C3: radial internal clearance greater than Normal

An open 6311-C3, sealed 6311-2RSR with Normal clearance and 6311-2RSR-C3 are technically different products despite having identical principal dimensions.

Selection and Interchangeability

When selecting an equivalent for FAG 6311-2RSR-C3, verify:

Bearing Type: Single-row deep groove ball bearing
Bore d: 55 mm
Outside Diameter D: 120 mm
Width B: 29 mm
Dimensions: 55x120x29 mm
Closure: Contact seals on both sides
FAG Suffix: 2RSR
Radial Internal Clearance: C3
Bore: Cylindrical
Cage: Steel

Identical dimensions alone do not establish complete interchangeability. Seal configuration, internal clearance, tolerances and operating requirements should also correspond.

Technical Specification

Manufacturer: FAG / Schaeffler
Catalogue Designation: 6311-2RSR-C3
Commercial Designation: 6311 2RS C3
Bearing Type: Deep groove ball bearing
Construction: Single row
Bore Diameter d: 55 mm
Outside Diameter D: 120 mm
Width B: 29 mm
Dimensions: 55x120x29 mm
Sealing: Both sides
Seal Type: Contact
Radial Internal Clearance: C3, greater than Normal
Bore: Cylindrical
Cage: Steel
Mass: approximately 1.38 kg

FAQ

What are the dimensions of FAG 6311-2RSR-C3?

The bearing measures 55x120x29 mm: d = 55 mm bore diameter, D = 120 mm outside diameter and B = 29 mm width.

What type of bearing is FAG 6311-2RSR-C3?

It is a single-row deep groove ball bearing with a cylindrical bore and contact seals on both sides.

What does 2RSR mean on a FAG bearing?

2RSR means contact seals on both sides of the bearing. The seals help retain lubricant and protect the internal rolling contacts against contamination.

What does C3 mean?

C3 means radial internal clearance greater than Normal. It is an internal clearance classification, not an accuracy or quality grade.

Is FAG 6311-2RSR the same as 6311-2RSR-C3?

No. They have the same principal dimensions and sealing configuration, but the C3 version has greater radial internal clearance.

What loads can FAG 6311-2RSR-C3 accommodate?

Its deep groove ball bearing geometry primarily accommodates radial loads and can also support axial loads in both directions.

Is an open 6311-C3 equivalent to 6311-2RSR-C3?

Not automatically. Both may have C3 clearance and the same dimensions, but 6311-2RSR-C3 has contact seals on both sides, while the open version does not.

Can another manufacturer's 55x120x29 bearing replace FAG 6311-2RSR-C3?

Not based on dimensions alone. Bearing type, sealing, C3 clearance, tolerances and operating requirements should also be verified.

AI Overview

FAG 6311-2RSR-C3 is a single-row deep groove ball bearing measuring 55x120x29 mm, with d = 55 mm, D = 120 mm and B = 29 mm. It features contact seals on both sides, a cylindrical bore, steel cage and C3 radial internal clearance greater than Normal.