604ZZ EZO 4x12x4 mm - Miniature Deep Groove Ball Bearing

604ZZ EZO 4x12x4 mm - Miniature Deep Groove Ball Bearing

EZO 604ZZ is a miniature deep groove ball bearing with dimensions 4x12x4 mm. The ZZ version is fitted with metal shields on both sides, helping to reduce the ingress of contaminants and retain lubricant inside the bearing. The 604 belongs to the metric miniature bearing range and is designed for compact mechanisms requiring small installation dimensions and low-friction rotary motion.

Technical data

EZO 604ZZ dimensions

The EZO 604ZZ bearing has the following dimensions:

d: 4 mm
D: 12 mm
B: 4 mm

Complete dimensional specification:

4x12x4 mm

When selecting a replacement, all three dimensions and the bearing closure type should be verified. A 4 mm bore alone is not sufficient to identify the correct bearing.

What does 604ZZ mean?

The complete designation 604ZZ identifies both the bearing size and its closure configuration.

604 - miniature deep groove ball bearing size with dimensions 4x12x4 mm.

ZZ - metal shields on both sides of the bearing.

The complete 604ZZ designation is important because the shielded version differs functionally from an open 604 bearing.

EZO 604ZZ construction

EZO 604ZZ is a single-row deep groove ball bearing.

Its basic construction consists of:

• inner ring,
• outer ring,
• balls,
• cage,
• metal shield on each side.

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

What does ZZ mean?

The suffix ZZ indicates metal shields on both sides of the bearing.

The shields help to:

• reduce the ingress of contaminants,
• retain lubricant inside the bearing,
• protect the raceways and rolling elements,
• maintain relatively low running friction due to their non-contact design.

Metal ZZ shields should not be confused with contact elastomer seals.

604ZZ vs 604

Both versions have the same basic dimensions:

4x12x4 mm

The difference is the bearing closure.

604 - open version.

604ZZ - metal shields on both sides.

The open version provides direct access to the rolling elements, while the ZZ version provides additional protection for the bearing interior.

604ZZ vs 604 2RS

The primary difference is the closure system.

604ZZ - non-contact metal shields on both sides.

604 2RS - elastomer seals on both sides.

ZZ shields are particularly useful where low running friction is important. Contact-sealed versions provide different protection against contamination but generally have different friction characteristics.

The ZZ and 2RS versions should not automatically be considered functionally interchangeable.

Miniature 4x12x4 mm bearing

With a 4 mm bore and an outside diameter of only 12 mm, EZO 604ZZ belongs to the miniature bearing category.

Its compact 4x12x4 mm cross-section allows it to be used in mechanisms where installation space is limited.

Correct shaft and housing fits, alignment and cleanliness are particularly important when working with miniature bearings.

Selection and interchangeability

When selecting an EZO 604ZZ, verify:

• complete 604ZZ designation,
• 4 mm bore diameter,
• 12 mm outside diameter,
• 4 mm width,
• metal shields on both sides,
• required load capacity,
• operating speed,
• environmental conditions,
• lubrication requirements,
• shaft and housing fits.

Matching dimensions are essential, but dimensions alone do not confirm complete functional interchangeability.

Applications

Miniature deep groove ball bearings are used in compact mechanisms requiring small installation dimensions, accurate shaft guidance and low-friction rotary motion.

The suitability of EZO 604ZZ for a specific application should be determined from the equipment documentation, actual operating loads, rotational speed and environmental conditions.

Installation

When installing a miniature 604ZZ bearing, mounting force should not be transmitted through the balls.

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

The bearing should also be protected against impact, misalignment and contamination during installation.

Alternative designations and search references

The product may also be searched for as:

• EZO 604ZZ
• 604ZZ EZO
• 604 ZZ EZO
• EZO 604 ZZ
• 604ZZ 4x12x4
• EZO 604ZZ 4x12x4
• 604 ZZ 4x12x4
• 604 bearing 4x12x4
• 604ZZ bearing
• miniature bearing 4x12x4

FAQ - EZO 604ZZ

What are the dimensions of EZO 604ZZ?

The bearing measures 4x12x4 mm, with a 4 mm bore, 12 mm outside diameter and 4 mm width.

What type of bearing is 604ZZ?

It is a miniature single-row deep groove ball bearing.

What does ZZ mean in 604ZZ?

ZZ indicates metal shields on both sides of the bearing.

Is 604ZZ a metric bearing?

Yes. EZO 604ZZ has metric dimensions of 4x12x4 mm.

What is the difference between 604 and 604ZZ?

604 is the open version, while 604ZZ has metal shields on both sides.

Are 604ZZ and 604 2RS the same?

No. They have the same basic bearing size but use different closure systems. ZZ indicates metal shields, while 2RS refers to a sealed version.

Can any 4x12x4 mm bearing replace EZO 604ZZ?

Not automatically. In addition to dimensions, the bearing construction, closure type and required operating parameters should be checked.

EZO 604ZZ - key information

EZO 604ZZ 4x12x4 mm is a miniature metric deep groove ball bearing with metal shields on both sides. It has a 4 mm bore, 12 mm outside diameter and 4 mm width. The ZZ construction helps protect the bearing interior while maintaining relatively low running friction.

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