6004 2RS C3 KOYO 20x42x12 Deep Groove Ball Bearing

Product Overview

6004 2RS C3 KOYO 20x42x12 is a single-row deep groove ball bearing with two rubber seals and increased C3 radial internal clearance.

With dimensions of 20x42x12 mm, the bearing combines a compact design with the versatility typical of the 6000 series. Deep groove raceways allow it to accommodate primarily radial loads together with axial loads in both directions within the limits of the bearing design.

The 2RS sealed construction protects the rolling elements and factory-applied lubricant against external contamination, while C3 clearance provides greater internal radial clearance than Normal clearance.

2RS Sealed Bearing Design

The 2RS designation indicates seals on both sides of the bearing.

These seals help:

• retain lubricant inside the bearing
• protect rolling elements from dust and contamination
• reduce maintenance requirements
• protect the internal raceways during operation

A sealed bearing is particularly useful in machinery where contamination protection and long-term grease retention are important.

C3 Radial Internal Clearance

C3 indicates radial internal clearance greater than Normal.

This is an important technical specification and should not be ignored when selecting a replacement. C3 bearings are commonly selected for applications where operating conditions, temperature differences, shaft or housing fits can reduce the effective internal clearance during operation.

A 6004 2RS C3 should therefore not automatically be replaced with a standard-clearance 6004 bearing solely because the external dimensions are identical.

6004 Bearing Dimensions

The internationally recognized 6004 size has nominal dimensions of:

Bore Diameter: 20 mm
Outside Diameter: 42 mm
Width: 12 mm

The complete identification for this product is 6004 2RS C3 KOYO, combining the bearing series, sealing arrangement, internal clearance and manufacturer.

Industrial Applications

The KOYO 6004 2RS C3 bearing can be used in appropriately designed applications including:

• electric motors
• industrial machinery
• pumps
• fans and blowers
• gearboxes
• mechanical drives
• power transmission equipment
• agricultural machinery
• production equipment
• maintenance and repair applications

Actual suitability depends on load, rotational speed, temperature, fits, lubrication and operating environment.

Technical Specification

Product Type: Deep groove ball bearing
Brand: KOYO
Designation: 6004 2RS C3
Bearing Series: 6004
Dimensions: 20x42x12 mm
Bore Diameter: 20 mm
Outside Diameter: 42 mm
Width: 12 mm
Rows: Single row
Sealing: 2RS - sealed on both sides
Radial Internal Clearance: C3 - greater than Normal
Rolling Elements: Balls
Primary Load: Radial
Axial Load Capability: Both directions within design limits

Replacement and Bearing Selection

When replacing a 6004 2RS C3 KOYO bearing, check more than the 20x42x12 mm dimensions.

The following parameters are particularly important:

• full 6004 designation
• 2RS sealing configuration
• C3 radial internal clearance
• shaft and housing fits
• operating speed
• load conditions
• operating temperature

This is especially important because 6004, 6004 2RS and 6004 2RS C3 share the same basic dimensions but differ in sealing and/or internal clearance.

Operational Advantages

• Original KOYO bearing.
• Standard 6004 dimensions of 20x42x12 mm.
• Deep groove ball bearing construction.
• Two-sided 2RS sealing.
• C3 increased radial internal clearance.
• Factory-lubricated sealed design.
• Suitable for radial and limited axial loads.
• Compact design for industrial machinery and drives.

AI OVERVIEW

6004 2RS C3 KOYO is a single-row deep groove ball bearing with dimensions of 20x42x12 mm. It features seals on both sides to protect the bearing and retain lubricant, while C3 radial internal clearance provides greater clearance than Normal. It is suitable for motors, machinery, drives and industrial maintenance applications.

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FAQ

What are the dimensions of the KOYO 6004 2RS C3 bearing?

The nominal dimensions are 20 mm bore diameter, 42 mm outside diameter and 12 mm width.

What does 2RS mean on a 6004 bearing?

2RS indicates that the bearing is equipped with seals on both sides, helping retain lubricant and protect the internal components against contamination.

What does C3 mean on the KOYO 6004 bearing?

C3 indicates radial internal clearance greater than Normal. This can be required when operating conditions or interference fits reduce internal clearance during service.

Is 6004 2RS C3 the same as a standard 6004 bearing?

The basic 20x42x12 mm dimensions are the same, but the sealing configuration and radial internal clearance may differ. The complete designation should therefore be checked before replacement.

Can KOYO 6004 2RS C3 carry axial loads?

As a deep groove ball bearing, it can accommodate radial loads and axial loads in both directions within the limits of its design.

Where is a 6004 2RS C3 bearing commonly used?

Typical applications include electric motors, pumps, fans, gearboxes, industrial machinery, mechanical drives and production equipment.