SKF 6307-2RS1/C3 35x80x21 Deep Groove Ball Bearing

SKF 6307-2RS1/C3 is a single-row deep groove ball bearing measuring 35x80x21 mm. It has a 35 mm bore, 80 mm outside diameter and 21 mm width. The 2RS1 configuration has contact seals on both sides, while the C3 suffix identifies increased radial internal clearance compared with the Normal clearance group. SKF documentation confirms 6307-2RS1/C3 as a specific product designation.

SKF 6307-2RS1/C3 - Product Characteristics

The bearing belongs to SKF's 63 series of single-row deep groove ball bearings.

For the 6307-2RS1 construction, SKF specifies:

Number of rows: 1
Bore type: Cylindrical
Sealing: Both sides
Seal type: Contact
Cage: Sheet metal
Lubricant: Grease
Bearing material: Bearing steel
Dimensions: 35x80x21 mm.

The exact 6307-2RS1/C3 variant retains this fundamental bearing and sealing configuration while specifying C3 radial internal clearance. This distinction is technically important when replacing a bearing.

Dimensions

The principal dimensions of SKF 6307-2RS1/C3 are:

d - Bore Diameter: 35 mm
D - Outside Diameter: 80 mm
B - Width: 21 mm
Commercial Size: 35x80x21 mm

For this bearing, the dimensional notation 35x80x21 mm corresponds to d x D x B.

The bore code 07 corresponds to a nominal bore diameter of 35 mm.

Deep Groove Ball Bearing Construction

SKF 6307-2RS1/C3 is a single-row deep groove ball bearing.

The rolling elements are balls running between deep raceway grooves in the inner and outer rings. This raceway geometry allows the bearing to accommodate primarily radial loads while also supporting axial loads acting in both directions.

The construction is non-separable. SKF specifies a sheet-metal cage and bearing-steel construction for the 6307-2RS1 configuration.

2RS1 Contact Seals

The 2RS1 suffix identifies the sealing arrangement of this SKF bearing.

SKF specifies seals on both sides and a contact sealing type for 6307-2RS1.

The seals help retain grease within the bearing and restrict the ingress of contaminants into the rolling contact area.

This distinguishes the product from other 6307 configurations such as open 6307 or shielded 6307-2Z bearings. Identical principal dimensions do not make these closure arrangements technically identical.

C3 Radial Internal Clearance

The C3 suffix is a critical part of the 6307-2RS1/C3 designation.

C3 identifies radial internal clearance greater than Normal. Consequently:

6307-2RS1 ≠ 6307-2RS1/C3

The two variants share the same 35x80x21 mm dimensions and sealing configuration but have different radial internal clearance specifications.

Increased clearance can be required where fits, temperature differences or other operating factors reduce the bearing's internal clearance after mounting. However, C3 should not be selected simply as an assumed upgrade over Normal clearance; the correct clearance group depends on the bearing arrangement and operating conditions.

Load Ratings and Operating Principle

SKF catalogue data for the 6307 bearing size specify:

C - Basic Dynamic Load Rating: 35.1 kN
C0 - Basic Static Load Rating: 19 kN
Pu - Fatigue Load Limit: 0.815 kN.

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

C and C0 are standardized bearing load ratings used in bearing calculations. They should not be interpreted as simple maximum permissible operating loads for a machine.

Actual bearing selection requires consideration of load magnitude and direction, required rating life, rotational speed, shaft and housing fits, internal clearance, lubrication, temperature and operating environment.

Meaning of 6307-2RS1/C3

The complete SKF designation provides important technical information:

6 - deep groove ball bearing family

63 - dimensional series

07 - bore code corresponding to 35 mm

2RS1 - contact seals on both sides

C3 - radial internal clearance greater than Normal

The complete designation 6307-2RS1/C3 should therefore be retained when identifying, ordering or comparing the bearing.

The shortened commercial description 6307 2RS C3 is less precise than the complete SKF designation.

SKF 6307-2RS1/C3 vs 6307-2RS1

Both bearings have:

d = 35 mm
D = 80 mm
B = 21 mm
Contact seals on both sides

The key difference is radial internal clearance.

The standard 6307-2RS1 product is specified with Normal radial internal clearance, while 6307-2RS1/C3 specifies increased C3 clearance. SKF lists the C3 configuration as a separate designation.

They should therefore not be treated as identical products solely because their dimensions and seals are the same.

SKF 6307-2RS1/C3 vs 6307-2Z/C3

Both versions can have C3 clearance and the same 35x80x21 mm principal dimensions, but their closure arrangements differ.

6307-2RS1/C3: contact seals on both sides

6307-2Z/C3: shields on both sides

The choice between seals and shields can affect contaminant protection, lubricant retention, friction and speed capability. The two configurations should therefore not automatically be substituted for one another.

Selection and Interchangeability

When selecting a replacement for SKF 6307-2RS1/C3, compare:

• single-row deep groove ball bearing construction,
• d = 35 mm,
• D = 80 mm,
• B = 21 mm,
• contact seals on both sides,
• C3 radial internal clearance,
• dynamic and static load ratings,
• required rotational speed,
• shaft and housing fits,
• lubrication,
• temperature and operating conditions.

A bearing from another manufacturer with the designation 6307, dimensions 35x80x21 mm and C3 clearance is not proven to be a complete technical equivalent from these characteristics alone.

The sealing configuration and remaining technical parameters must also be checked.

Technical Specification

Manufacturer / Brand: SKF
Designation: 6307-2RS1/C3
Bearing Type: Deep groove ball bearing
Construction: Single row
Dimensions: 35x80x21 mm
d - Bore Diameter: 35 mm
D - Outside Diameter: 80 mm
B - Width: 21 mm
Bore Type: Cylindrical
Sealing: Both sides
Seal Type: Contact
Radial Internal Clearance: C3 - greater than Normal
Cage: Sheet metal
Lubrication: Grease
Bearing Material: Bearing steel
Basic Dynamic Load Rating C: 35.1 kN
Basic Static Load Rating C0: 19 kN
Fatigue Load Limit Pu: 0.815 kN

FAQ

What are the dimensions of SKF 6307-2RS1/C3?

SKF 6307-2RS1/C3 measures 35x80x21 mm: d = 35 mm bore diameter, D = 80 mm outside diameter and B = 21 mm width.

What type of bearing is SKF 6307-2RS1/C3?

It is a single-row deep groove ball bearing with a cylindrical bore.

What does 2RS1 mean?

For this SKF configuration, 2RS1 identifies contact seals on both sides of the bearing.

What does C3 mean on SKF 6307-2RS1/C3?

C3 means that the radial internal clearance is greater than Normal. It is an important technical selection parameter and should not be omitted from the product designation.

What is the load rating of SKF 6307?

SKF catalogue data specify C = 35.1 kN, C0 = 19 kN and Pu = 0.815 kN for the 6307 size.

Can SKF 6307-2RS1/C3 carry axial loads?

Yes. Deep groove ball bearing geometry allows the bearing to accommodate radial loads and axial loads acting in both directions.

Is 6307-2RS1 the same as 6307-2RS1/C3?

No. They have the same principal dimensions and sealing arrangement, but 6307-2RS1/C3 has greater-than-Normal C3 radial internal clearance.

Can 6307-2Z/C3 replace 6307-2RS1/C3?

Not automatically. The dimensions and clearance group can match, but the closure arrangements differ: 2RS1 uses contact seals, whereas 2Z uses shields.

AI Overview

SKF 6307-2RS1/C3 is a single-row deep groove ball bearing measuring 35x80x21 mm, with contact seals on both sides and C3 radial internal clearance greater than Normal. SKF catalogue data for the 6307 size specify a basic dynamic load rating C of 35.1 kN, static rating C0 of 19 kN and Pu of 0.815 kN.