6904-2RS EZO 20x37x9 mm - Thin-Section Deep Groove Ball Bearing

6904-2RS EZO 20x37x9 mm - Thin-Section Deep Groove Ball Bearing

EZO 6904-2RS is a single-row thin-section deep groove ball bearing with dimensions 20x37x9 mm, belonging to the compact 69 dimension series. The 2RS version features seals on both sides, helping protect the raceways and rolling elements against contaminants while retaining lubricant inside the bearing. Its compact cross-section makes it suitable for bearing arrangements with limited radial installation space.

Technical data

EZO 6904-2RS dimensions

The basic dimensions are:

d: 20 mm
D: 37 mm
B: 9 mm

Complete dimensional specification:

20x37x9 mm

The 69 series has a relatively small radial cross-section in relation to the bore diameter, allowing 6904-2RS to be used in compact bearing arrangements.

What does 6904-2RS mean?

69 - compact thin-section dimension series of deep groove ball bearings.

04 - bore code corresponding to a 20 mm bore diameter.

2RS - seals on both sides of the bearing.

The complete 6904-2RS designation should be retained when identifying the product because the 6904 bearing size is available in different closure configurations.

EZO 6904-2RS construction

EZO 6904-2RS is a single-row deep groove ball bearing consisting of:

• inner ring,
• outer ring,
• balls,
• cage,
• seals on both sides.

Its deep raceway geometry is designed primarily to accommodate radial loads. Deep groove ball bearings can also accommodate axial loads within the operating limits of the specific bearing arrangement.

What does 2RS mean?

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

The seals help to:

• reduce the ingress of contaminants,
• protect the raceways and rolling elements,
• retain lubricant inside the bearing,
• protect the bearing interior during operation.

The exact seal material and detailed seal geometry should not be determined solely from the 2RS designation without confirmation of the specific manufacturer's specification.

6904-2RS vs 6904ZZ

Both versions have the same basic dimensions:

20x37x9 mm

The principal difference is the closure system.

6904-2RS - seals on both sides.

6904ZZ - metal shields on both sides.

The appropriate version should be selected according to contamination levels, protection requirements, operating speed and the conditions of the specific bearing arrangement.

6904-2RS vs open 6904

6904-2RS has seals on both sides.

The basic open 6904 version does not have these closures.

Although the basic dimensions are the same, these are different bearing configurations. The 2RS suffix should therefore not be omitted when identifying or selecting the product.

Compact 6904 series design

With a 20 mm bore, the bearing has an outside diameter of only 37 mm and a width of 9 mm.

This compact geometry helps reduce the radial space required by the bearing arrangement. However, the smaller cross-section also means that load and speed requirements should be checked rather than selecting the bearing solely according to bore diameter.

Selection and interchangeability

Before selecting EZO 6904-2RS, verify:

• complete 6904-2RS designation,
• 20 mm bore diameter,
• 37 mm outside diameter,
• 9 mm width,
• 2RS sealing on both sides,
• required load capacity,
• operating speed,
• environmental conditions,
• lubrication requirements,
• shaft and housing fits.

Matching 20x37x9 mm dimensions alone does not automatically confirm complete interchangeability between different 6904 variants.

Installation

Before installation, ensure that the bearing, shaft and housing are clean.

When fitting the bearing onto a shaft, mounting force should be applied to the inner ring. When pressing it into a housing, force should be applied to the outer ring.

Mounting force should not be transmitted through the balls, and direct pressure on the seals should be avoided.

Alternative designations and reference formats

• EZO 6904-2RS
• 6904-2RS EZO
• 6904 2RS EZO
• EZO 6904 2RS
• 6904-2RS 20x37x9
• EZO 6904-2RS 20x37x9
• 6904 2RS 20x37x9
• 6904 bearing 20x37x9

FAQ - EZO 6904-2RS

What are the dimensions of EZO 6904-2RS?

The bearing measures 20x37x9 mm, with a 20 mm bore, 37 mm outside diameter and 9 mm width.

What type of bearing is 6904-2RS?

It is a single-row thin-section deep groove ball bearing.

What does 2RS mean?

2RS indicates seals on both sides of the bearing.

What is the difference between 6904-2RS and 6904ZZ?

6904-2RS has seals on both sides, while 6904ZZ uses metal shields on both sides.

Is 6904-2RS the same as an open 6904 bearing?

No. The basic dimensions are the same, but 6904-2RS has seals on both sides, while the open 6904 does not.

Can 6904-2RS accommodate axial loads?

As a deep groove ball bearing, it is primarily designed for radial loads but can also accommodate axial loads within the operating limits of the bearing arrangement.

Can any 20x37x9 mm bearing replace EZO 6904-2RS?

Not automatically. The complete designation, closure design and required operating characteristics should also be verified.

6904-2RS EZO - key information

EZO 6904-2RS 20x37x9 mm is a single-row thin-section deep groove ball bearing from the compact 69 series. It has a 20 mm bore, 37 mm outside diameter and 9 mm width. The 2RS designation identifies seals on both sides, helping protect the bearing interior against contaminants and retain lubricant.

Available from simmering.pl, a specialist supplier of bearings and industrial components. Stock in Poland with worldwide shipping.