FAG 6306-2RSR-C3 Deep Groove Ball Bearing 30x72x19

FAG 6306-2RSR-C3 - Characteristics

The 6306 belongs to the FAG deep groove ball bearing family. Its raceway geometry is designed primarily to accommodate radial loads while also allowing axial loads to act in both directions.

For this specific version, the technically important characteristics are the 6306 geometry, double-sided 2RSR sealing and C3 radial internal clearance. The bearing should therefore not be identified only as a generic 6306 or by its dimensions.

Dimensions

FAG catalogue dimensions for 6306 are:

d - Bore Diameter: 30 mm
D - Outside Diameter: 72 mm
B - Width: 19 mm

The complete boundary dimensions are 30x72x19 mm. Schaeffler's FAG catalogue confirms these dimensions for the open, 2Z and 2RSR versions of 6306.

Bearing Construction

FAG 6306-2RSR-C3 is a single-row deep groove ball bearing. The balls operate between deep raceway grooves in the inner and outer rings.

This geometry allows the bearing to accommodate radial loads and axial loads in both directions. FAG documentation also confirms that standard bearings of series 63 up to bore code 24 use a pressed steel cage without a cage suffix. Since 6306 has bore code 06, this catalogue rule applies to the standard construction.

2RSR Seals

For FAG bearings, the suffix 2RSR means seals on both sides. This is the correct FAG catalogue terminology and is more precise than the generic market designation "2RS".

The seals protect the bearing interior against contamination and help retain lubricant within the bearing. A 6306-2RSR should therefore be distinguished from a 6306-2ZR, where FAG uses shields on both sides rather than seals.

C3 Radial Internal Clearance

The suffix C3 means radial internal clearance greater than Normal. FAG explicitly defines C3 this way in its deep groove ball bearing documentation.

C3 is an important selection parameter. Internal clearance changes after mounting as a result of fits and can also change during operation due to temperature differences between the bearing rings. Consequently, a bearing specified as 6306-2RSR-C3 should not automatically be replaced by a 6306-2RSR with Normal clearance.

Load Direction and Operation

The deep groove raceway geometry of the FAG 6306 enables the bearing to carry radial loads and axial loads in both directions.

The actual suitability of the bearing for a particular machine cannot be determined from dimensions alone. Load magnitude, rotational speed, shaft and housing fits, operating temperature, lubrication conditions and required bearing life must be considered when designing or verifying the bearing arrangement.

Meaning of FAG 6306-2RSR-C3

The designation can be read as:

6306: deep groove ball bearing of the 63 dimension series

2RSR: seals on both sides

C3: radial internal clearance greater than Normal

The commonly searched designation FAG 6306 2RS C3 therefore describes the same general configuration, but 2RSR is the FAG catalogue suffix that should be used for precise product identification.

Selection and Interchangeability

When selecting an equivalent for FAG 6306-2RSR-C3, verify more than the 30x72x19 mm dimensions.

The replacement should correspond in bearing type, boundary dimensions, double-sided sealing and C3 radial internal clearance. Load capacity, speed capability and operating conditions should also be checked for the specific alternative.

For example, 6306-2ZR-C3 should not automatically be treated as identical because 2ZR identifies shields on both sides, while 2RSR identifies seals.

Technical Specification

Manufacturer: FAG / Schaeffler
Catalogue Designation: 6306-2RSR-C3
Type: Single-row deep groove ball bearing
Bore Diameter d: 30 mm
Outside Diameter D: 72 mm
Width B: 19 mm
Dimensions: 30x72x19 mm
Number of Rows: 1
Sealing: Seals on both sides
Seal Suffix: 2RSR
Radial Internal Clearance: C3, greater than Normal
Cage: Pressed steel cage, standard execution without cage suffix
Load Direction: Radial and axial in both directions

The catalogue data confirm a mass of approximately 0.365 kg for FAG 6306-2RSR.

FAQ

What are the dimensions of FAG 6306-2RSR-C3?

The bearing measures 30x72x19 mm: d = 30 mm, D = 72 mm and B = 19 mm.

What does 2RSR mean on a FAG bearing?

2RSR means seals on both sides. It is the FAG catalogue suffix for this sealing configuration.

What does C3 mean in FAG 6306-2RSR-C3?

C3 means radial internal clearance greater than Normal. It is a functional part of the bearing specification and should be retained when the application requires C3 clearance.

Is FAG 6306 2RS C3 the same designation as 6306-2RSR-C3?

"6306 2RS C3" is a common market description. FAG uses 2RSR in its catalogue terminology for seals on both sides, making 6306-2RSR-C3 the more precise technical designation.

What type of bearing is FAG 6306-2RSR-C3?

It is a single-row deep groove ball bearing designed primarily for radial loading while also accommodating axial loads in both directions.

Can FAG 6306-2ZR-C3 replace 6306-2RSR-C3?

Not automatically. Both may have 30x72x19 mm dimensions and C3 clearance, but 2ZR uses shields while 2RSR uses seals. The required protection, friction and operating conditions must be considered.

Can a 6306-2RSR with Normal clearance replace 6306-2RSR-C3?

Not automatically. The C3 version has greater radial internal clearance. Changing the clearance class can affect operating clearance after mounting and at operating temperature.

AI Overview

FAG 6306-2RSR-C3 is a single-row deep groove ball bearing measuring 30x72x19 mm, with seals on both sides and C3 radial internal clearance greater than Normal. FAG uses the suffix 2RSR for double-sided sealing and C3 for increased radial clearance. The bearing accommodates radial and axial loads in both directions.