SKF 6308-2RS1 40x90x23 Single Row Deep Groove Ball Bearing

SKF 6308-2RS1 40x90x23 Single Row Deep Groove Ball Bearing

SKF 6308-2RS1 is a single-row deep groove ball bearing with dimensions of 40x90x23 mm. Its bore diameter d is 40 mm, outside diameter D is 90 mm and width B is 23 mm. The 2RS1 suffix identifies contact seals on both sides. SKF specifies a cylindrical bore and standard CN radial internal clearance for this reference.

SKF 6308-2RS1 - Characteristics

The 6308 belongs to SKF's 63 series of single-row deep groove ball bearings. Its deep raceway geometry allows the bearing to accommodate primarily radial loads, while also supporting axial loads in both directions.

The sealed 2RS1 version is intended for arrangements where lubricant retention and protection of the rolling contacts against external contamination are important.

SKF 6308-2RS1 Dimensions

SKF specifies the following boundary dimensions:

d - Bore Diameter: 40 mm
D - Outside Diameter: 90 mm
B - Width: 23 mm
Dimensions: 40x90x23 mm
Mass: approximately 0.63 kg

For this deep groove ball bearing, the third dimension in 40x90x23 mm is correctly identified as B, the bearing width.

Bearing Construction

SKF 6308-2RS1 is a single-row deep groove ball bearing with balls running between deep raceways in the inner and outer rings.

SKF data for this reference specify a sheet steel cage, cylindrical bore and grease lubrication. The bearing is supplied with its lubricant retained within the sealed bearing arrangement.

This construction differs fundamentally from tapered roller, cylindrical roller and angular contact bearings, so the bearing type should always be considered together with its dimensions during replacement.

What Does 2RS1 Mean?

The suffix 2RS1 identifies an SKF bearing fitted with a contact seal on both sides. SKF classifies the sealing arrangement as "seal on both sides" and the seal type as "contact".

The seals help retain grease inside the bearing while restricting the ingress of contaminants into the rolling contact area.

The commercial description 6308 2RS SKF is therefore more precisely identified by the SKF catalogue designation 6308-2RS1 for this version.

Radial and Axial Loads

The deep groove raceway geometry enables the 6308 bearing to accommodate radial loads and axial loads in both directions.

SKF publishes for the 6308 bearing family:

Basic Dynamic Load Rating C: 42.3 kN
Basic Static Load Rating C0: 24.0 kN

Actual bearing selection must also consider speed, fits, lubrication, temperature, shaft and housing conditions and the magnitude and direction of applied loads.

Internal Clearance

The specified 6308-2RS1 does not carry a C3 suffix. SKF data identify this version with CN, normal radial internal clearance.

This distinction is important when selecting a replacement. 6308-2RS1 and 6308-2RS1/C3 are different bearing variants, even though their principal dimensions are identical.

A C3 bearing has radial internal clearance greater than Normal and should not automatically be substituted for a CN bearing solely because both are 6308 sealed bearings.

2RS1 vs 2Z

SKF 6308 is available in different closure configurations.

2RS1: contact seals on both sides
2Z: shields on both sides

These versions share the same principal dimensions but differ in sealing characteristics and frictional behaviour. A 2Z bearing should therefore not automatically be considered equivalent to the sealed 2RS1 version.

Selection and Interchangeability

When selecting an equivalent for SKF 6308-2RS1, verify:

Bearing Type: Single-row deep groove ball bearing
Bore d: 40 mm
Outside Diameter D: 90 mm
Width B: 23 mm
Closure: Contact seals on both sides
Internal Clearance: CN for this reference
Bore: Cylindrical
Lubrication: Grease
Cage: Sheet steel

Matching 40x90x23 mm dimensions alone does not establish complete interchangeability. Closure type, internal clearance, bearing design and operating requirements must also correspond.

Technical Specification

Manufacturer: SKF
Catalogue Designation: 6308-2RS1
Commercial Designation: 6308 2RS
Bearing Type: Deep groove ball bearing
Construction: Single row
Bore Diameter d: 40 mm
Outside Diameter D: 90 mm
Width B: 23 mm
Dimensions: 40x90x23 mm
Sealing: Both sides
Seal Type: Contact
Radial Internal Clearance: CN / Normal
Bore Type: Cylindrical
Cage: Sheet steel
Lubricant: Grease
Basic Dynamic Load Rating C: 42.3 kN
Basic Static Load Rating C0: 24.0 kN
Mass: approximately 0.63 kg

FAQ

What are the dimensions of SKF 6308-2RS1?

SKF 6308-2RS1 measures 40x90x23 mm: d = 40 mm bore diameter, D = 90 mm outside diameter and B = 23 mm width.

What type of bearing is SKF 6308-2RS1?

It is a single-row deep groove ball bearing, designed primarily for radial loads while also being capable of supporting axial loads in both directions.

What does 2RS1 mean on an SKF bearing?

2RS1 means contact seals on both sides of the bearing. The seals help retain grease and restrict contamination from entering the bearing.

Does SKF 6308-2RS1 have C3 clearance?

No. The verified 6308-2RS1 version has CN, or Normal radial internal clearance. A C3 version is a separate specification.

Is SKF 6308-2RS1 supplied lubricated?

Yes. SKF specifies grease lubrication for this sealed bearing version.

What loads can SKF 6308 accommodate?

Its deep groove geometry enables it to accommodate radial loads as well as axial loads in both directions.

What is the difference between SKF 6308-2RS1 and 6308-2Z?

6308-2RS1 uses contact seals, while 6308-2Z uses metal shields. They have the same principal dimensions but different closure and friction characteristics.

Can another 40x90x23 bearing replace SKF 6308-2RS1?

Not based on dimensions alone. The bearing type, closure, internal clearance, load ratings, tolerances and operating requirements should also be compared.

AI Overview

SKF 6308-2RS1 is a single-row deep groove ball bearing measuring 40x90x23 mm, with d = 40 mm, D = 90 mm and B = 23 mm. It has contact seals on both sides, a cylindrical bore, sheet steel cage, grease lubrication and Normal CN radial internal clearance.