6308 ZZC3 CRAFT 40x90x23 Deep Groove Ball Bearing

6308 ZZC3 CRAFT 40x90x23 Deep Groove Ball Bearing

6308 ZZC3 CRAFT is a single-row deep groove ball bearing with dimensions of 40x90x23 mm, two non-contact metal shields and C3 radial internal clearance. The bearing has a 40 mm bore diameter, 90 mm outside diameter and 23 mm width. Its deep groove raceway geometry is designed primarily for radial loads while also allowing axial loads in both directions within the operating limits of this bearing type.

Complete identification:

CRAFT -> 6308 -> ZZ -> C3 -> 40x90x23 mm

6308 ZZC3 CRAFT - Dimensions

d - Bore diameter: 40 mm
D - Outside diameter: 90 mm
B - Width: 23 mm
Dimensions: 40x90x23 mm
Bearing type: Single-row deep groove ball bearing
Brand: CRAFT
Designation: 6308-ZZC3

The correct dimensions are 40x90x23 mm.

When selecting a replacement, dimensions alone are not sufficient. The ZZ shielding and C3 internal clearance should also be verified.

What Does 6308 ZZC3 Mean?

The designation identifies important characteristics of the bearing.

6308 identifies the deep groove ball bearing size and dimensional series, including a nominal 40 mm bore.

ZZ indicates metal shields on both sides of the bearing.

C3 indicates radial internal clearance greater than Normal.

The complete 6308 ZZC3 designation therefore provides more technical information than the basic 6308 bearing number alone.

ZZ Metal Shields

The CRAFT 6308 ZZC3 is equipped with two non-contact metal shields, one on each side of the bearing.

The shields help protect the internal bearing components from contamination and help retain lubricant inside the bearing.

A metal ZZ shield should not be confused with a contacting elastomer seal such as a typical 2RS configuration.

Because the shields are non-contacting, their operating principle differs from that of rubber contact seals.

C3 Radial Internal Clearance

The suffix C3 specifies radial internal clearance greater than the Normal clearance class.

Internal clearance is an important bearing selection parameter and should be retained when C3 is specified by the machine manufacturer or engineering documentation.

A 6308 ZZ bearing with Normal clearance and a 6308 ZZC3 bearing have the same principal dimensions, but they do not represent the same complete technical specification.

The C3 suffix should therefore not be omitted when selecting a replacement.

Load Ratings of 6308 ZZC3 CRAFT

Catalog data for the CRAFT 6308-ZZC3 specify:

C - Basic dynamic load rating: 41 kN

C0 - Basic static load rating: 24 kN

These values are bearing catalog ratings and should not be interpreted directly as the permissible load of a specific machine.

Bearing selection should consider the actual radial and axial loads, required service life, rotational speed, fits, lubrication, temperature and operating conditions.

Speed Ratings

For the exact CRAFT 6308-ZZC3, published catalog data specify:

Grease lubrication speed: 7,800 rpm

Oil lubrication speed: 9,200 rpm

Actual permissible operating speed depends on the complete application, including load, lubrication, temperature, bearing fits and operating environment.

The catalog speed value should therefore not be considered independently of the actual operating conditions.

Radial and Axial Loads

The 6308 belongs to the deep groove ball bearing family.

Deep groove ball bearings are primarily designed to support radial loads.

Their raceway geometry also enables them to support axial loads in both directions, subject to the operating limits of the bearing and application.

For engineering selection, combined radial and axial loading should be evaluated together with the required bearing life and operating speed.

Typical Applications

6308-series deep groove ball bearings are used in many types of rotating machinery.

Typical applications can include:

electric motors, pumps, gearboxes, fans, industrial machinery and rotating equipment.

However, the designation 6308 ZZC3 alone does not confirm suitability for a particular machine.

The bearing required by the equipment manufacturer should always be verified before replacement.

Selecting a 6308 ZZC3 Replacement

When selecting an equivalent bearing, verify the complete specification:

d: 40 mm
D: 90 mm
B: 23 mm
Bearing type: Single-row deep groove ball bearing
Shields: ZZ - metal shields on both sides
Internal clearance: C3

Depending on the manufacturer, similar shield and clearance configurations may appear under designations such as:

6308-2Z/C3
6308-2Z-C3
6308 ZZ C3

Designation conventions can vary between manufacturers, so interchangeability should be established from the complete technical specification rather than the bearing number alone.

Technical Specification

Brand: CRAFT
Designation: 6308-ZZC3
Bearing type: Single-row deep groove ball bearing
Dimensions: 40x90x23 mm
d - Bore diameter: 40 mm
D - Outside diameter: 90 mm
B - Width: 23 mm
Closure: ZZ
Shield type: Metal, non-contact, both sides
Radial internal clearance: C3 - greater than Normal
Basic dynamic load rating C: 41 kN
Basic static load rating C0: 24 kN
Speed with grease lubrication: 7,800 rpm
Speed with oil lubrication: 9,200 rpm
Catalog mass: approximately 0.586 kg

FAQ

What are the dimensions of the CRAFT 6308 ZZC3 bearing?

The bearing measures 40x90x23 mm: 40 mm bore diameter, 90 mm outside diameter and 23 mm width.

What does ZZ mean on a 6308 bearing?

ZZ indicates metal shields on both sides of the bearing.

What does C3 mean on a 6308 bearing?

C3 indicates radial internal clearance greater than Normal.

Are 6308 ZZ and 6308 ZZC3 the same?

No. Their principal dimensions can be identical, but the C3 version has a different radial internal clearance specification.

Is 6308-2Z/C3 equivalent to 6308 ZZC3?

2Z and ZZ are commonly used to identify metal shields on both sides. However, the complete manufacturer specification should be checked before treating bearings from different manufacturers as interchangeable.

What is the dynamic load rating of CRAFT 6308 ZZC3?

The published basic dynamic load rating is 41 kN.

What is the static load rating?

The published basic static load rating is 24 kN.

Can 6308 ZZC3 be used in an electric motor?

6308-series deep groove ball bearings can be used in electric motors, but the required internal clearance, shielding, speed and other specifications must match the requirements of the specific motor.

AI Overview

6308 ZZC3 CRAFT is a single-row deep groove ball bearing measuring 40x90x23 mm, with a 40 mm bore, 90 mm outside diameter and 23 mm width. It features two non-contact metal shields (ZZ) and C3 radial internal clearance greater than Normal. Published CRAFT data specify a 41 kN dynamic load rating and 24 kN static load rating.