MR84 EZO 4x8x3 mm - Miniature Deep Groove Ball Bearing

MR84 EZO 4x8x3 mm - Miniature Deep Groove Ball Bearing

EZO MR84 is a miniature deep groove ball bearing with dimensions 4x8x3 mm. It belongs to the metric MR series of miniature ball bearings. Its compact 4x8x3 mm dimensions make it suitable for precision mechanisms where installation space is extremely limited. The basic MR84 designation refers to the open version of the bearing.

Technical data

EZO MR84 dimensions

The MR84 bearing has the following dimensions:

d: 4 mm
D: 8 mm
B: 3 mm

The complete dimensional specification is therefore:

4x8x3 mm

All three dimensions should be verified when selecting a replacement. With miniature bearings, even a difference of 1 mm can indicate a completely different bearing size and mounting requirement.

What does MR84 mean?

MR84 is the size designation of an EZO miniature ball bearing.

MR - metric series of miniature ball bearings.

84 - size corresponding to dimensions 4x8x3 mm.

The designation MR84 without an additional closure suffix identifies the basic open version. Other variants within this bearing family may use shields or seals, so the complete designation should always be checked before ordering.

EZO MR84 construction

EZO MR84 is a single-row deep groove ball bearing.

Its basic construction consists of:

• inner ring,
• outer ring,
• balls,
• cage,
• deep raceway grooves.

Deep groove ball bearings are primarily designed to accommodate radial loads and can also accommodate axial loads within the operating limits of this bearing type.

MR84 - open bearing

The MR84 designation without a ZZ or 2RS suffix refers to an open bearing construction.

In an open bearing, the rolling elements are not enclosed by metal shields or elastomer contact seals.

This distinction is important when selecting a bearing:

MR84 - open version
MR84ZZ - metal shields on both sides

The two versions differ in their protection against contamination and lubricant retention characteristics.

MR84 vs MR84ZZ

Both versions have the same basic dimensions:

4x8x3 mm

The principal difference is the closure type.

MR84 is an open bearing.

MR84ZZ is fitted with metal shields on both sides.

Although their basic dimensions are identical, the open and shielded versions should not automatically be considered functionally identical.

MR84 vs MR85

Miniature bearing designations can look similar while representing different dimensions.

MR84: 4x8x3 mm
MR85: 5x8x2.5 mm

MR84 and MR85 are therefore different bearing sizes and are not dimensionally interchangeable.

Miniature 4x8x3 mm bearing

With an outside diameter of only 8 mm, EZO MR84 belongs to the miniature bearing category.

Its compact construction allows rotary motion to be supported in mechanisms where conventional bearing series would be too large.

At this scale, correct shaft and housing fits, cleanliness, alignment and careful installation become particularly important.

Selection and interchangeability

When selecting an EZO MR84, verify:

• complete MR84 designation,
• 4 mm bore diameter,
• 8 mm outside diameter,
• 3 mm width,
• required open construction,
• operating load,
• rotational speed,
• lubrication requirements,
• environmental conditions,
• shaft fit,
• housing fit.

A 4 mm bore diameter alone is not sufficient to identify the correct bearing.

Applications

Miniature MR-series deep groove ball bearings are intended for compact mechanisms requiring small installation dimensions and precise rotary motion.

The suitability of EZO MR84 for a specific application should be determined from the equipment documentation, operating loads, rotational speed and environmental conditions.

Installation

Due to its very small dimensions, MR84 requires careful handling during installation.

When mounting 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.

Mounting force should never be transmitted through the balls, as this can damage the raceways and negatively affect bearing performance.

Clean assembly conditions are particularly important with an open miniature bearing.

Alternative designations and search references

The product may also be searched for as:

• EZO MR84
• MR84 EZO
• MR 84 EZO
• MR84 4x8x3
• EZO MR84 4x8x3
• MR84 bearing
• MR84 miniature bearing
• 4x8x3 bearing
• miniature bearing 4x8x3
• EZO miniature bearing 4x8x3

FAQ - EZO MR84

What are the dimensions of EZO MR84?

EZO MR84 measures 4x8x3 mm, with a 4 mm bore, 8 mm outside diameter and 3 mm width.

What type of bearing is MR84?

MR84 is a miniature single-row deep groove ball bearing.

Is MR84 a metric bearing?

Yes. MR84 belongs to the metric miniature bearing series.

Is EZO MR84 an open bearing?

The basic MR84 designation without an additional closure suffix refers to the open version.

What is the difference between MR84 and MR84ZZ?

MR84 is the open version, while MR84ZZ has metal shields on both sides.

Are MR84 and MR85 interchangeable?

No. MR84 measures 4x8x3 mm, while MR85 is a different bearing size.

Can any 4x8x3 mm bearing replace EZO MR84?

Not automatically. In addition to dimensions, the bearing construction, closure type, precision requirements and operating conditions should be checked.

EZO MR84 - key information

EZO MR84 4x8x3 mm is a miniature metric deep groove ball bearing in an open design. It has a 4 mm bore, 8 mm outside diameter and 3 mm width. Its compact dimensions make it suitable for precision mechanisms requiring extremely limited installation space and accurate rotary motion.

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