SR3ZZ EZO 4.762x12.7x4.978 mm - Stainless Steel Deep Groove Ball Bearing

SR3ZZ EZO 4.762x12.7x4.978 mm - Stainless Steel Deep Groove Ball Bearing

EZO SR3ZZ is a miniature inch-series stainless steel deep groove ball bearing with dimensions 4.762x12.7x4.978 mm. The ZZ version is fitted with metal shields on both sides. Its dimensions correspond to the nominal inch size 3/16 x 1/2 x 0.196 inch. SR3ZZ is designed for compact precision mechanisms requiring an inch-size bearing and low-friction shielded construction.

Technical data

EZO SR3ZZ dimensions

The SR3ZZ bearing has the following dimensions:

d: 4.762 mm
D: 12.7 mm
B: 4.978 mm

In inch dimensions:

3/16 x 1/2 x 0.196 inch

This is important when selecting a replacement. The 4.762 mm bore corresponds to 3/16 inch and should not be rounded to 5 mm.

A metric bearing with a 5 mm bore is therefore not a dimensional equivalent of the SR3ZZ.

What does SR3ZZ mean?

The complete designation SR3ZZ identifies a specific EZO miniature bearing configuration.

S - stainless steel construction.

R3 - inch-series bearing size with a nominal 3/16 inch bore and 1/2 inch outside diameter.

ZZ - metal shields on both sides of the bearing.

The complete SR3ZZ designation should be retained when selecting a replacement because bearings with similar dimensions can differ in material and closure type.

Deep groove ball bearing construction

EZO SR3ZZ is a single-row deep groove ball bearing.

Its basic construction consists of:

• inner ring,
• outer ring,
• balls,
• cage,
• two metal shields.

Deep raceway grooves allow this bearing type to accommodate primarily radial loads as well as axial loads within the operating limits of a miniature deep groove ball bearing.

Stainless steel construction

An important feature of the EZO SR3ZZ is its stainless steel construction.

Stainless steel bearings are used where improved corrosion resistance is required compared with conventional bearing steel.

However, stainless steel should not be interpreted as completely resistant to every corrosive environment. Actual suitability depends on operating conditions, moisture, temperature, chemicals, lubrication and other environmental factors.

What does ZZ mean?

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

The shields help limit the ingress of contaminants into the bearing while also helping retain lubricant inside.

Metal shields are not contact seals. Their non-contact construction generates relatively low additional friction, which is particularly useful in miniature bearings operating at high rotational speeds.

EZO SR3ZZ load rating

The basic dynamic load rating for EZO SR3ZZ is:

Cr: 1,110 N

Load capacity is one of several parameters that should be considered when designing or replacing a bearing arrangement. A miniature bearing should not be selected solely by its external dimensions.

Limiting speed

The specified limiting speeds for SR3ZZ are:

Grease lubrication: 51,000 min-1
Oil lubrication: 60,000 min-1

These are catalogue values under defined conditions. The permissible operating speed in an actual application also depends on load, temperature, lubrication, mounting conditions and heat dissipation.

SR3ZZ vs R3ZZ

Both SR3ZZ and R3ZZ have the same basic dimensions:

4.762x12.7x4.978 mm

However, they are not identical versions.

SR3ZZ - stainless steel version.
R3ZZ - standard R3 version.

Material differences can affect corrosion resistance and catalogue performance data. The complete bearing designation should therefore be checked rather than relying only on dimensions.

SR3ZZ vs SR3 2RS

Both versions belong to the miniature inch-size bearing family and may share the same basic dimensions.

The main difference is the closure type:

SR3ZZ - metal shields on both sides.

SR3 2RS - contact seals on both sides.

The ZZ version is particularly suitable where low friction and high rotational speed are important. A 2RS version provides a different level of protection against contamination but also has different friction characteristics.

ZZ and 2RS versions should therefore not be substituted automatically without checking the requirements of the application.

3/16 x 1/2 inch miniature bearing

EZO SR3ZZ belongs to the miniature inch-series bearing range.

A 3/16 inch bore corresponds to approximately 4.762 mm, while the 1/2 inch outside diameter corresponds to 12.7 mm.

This is particularly important in equipment designed around imperial dimensions. Replacing an inch-size bearing with the nearest metric size may result in incorrect shaft or housing fits.

Selection and interchangeability

When selecting an EZO SR3ZZ, verify:

• complete SR3ZZ designation,
• 4.762 mm bore diameter,
• 12.7 mm outside diameter,
• 4.978 mm width,
• inch dimensional system,
• stainless steel construction,
• ZZ metal shields,
• required load capacity,
• operating speed,
• environmental conditions,
• lubrication,
• required shaft and housing fits.

Similar external dimensions alone do not confirm interchangeability.

Applications

Miniature deep groove ball bearings of this type are used in compact precision mechanisms where small installation dimensions and low-friction rotary motion are required.

The suitability of SR3ZZ for a specific application should be determined from the equipment documentation, operating conditions and bearing arrangement requirements.

Installation

When installing a miniature bearing, mounting force should never be transmitted through the rolling elements.

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.

Due to the small dimensions of the SR3ZZ, clean assembly conditions, correct fits and protection against impact or misalignment are particularly important.

Alternative designations and search references

This bearing may also be searched for as:

• EZO SR3ZZ
• SR3ZZ EZO
• SR 3 ZZ EZO
• SR3 ZZ EZO
• SR3ZZ 4.762x12.7x4.978
• SR3ZZ 3/16x1/2
• EZO SR3ZZ 3/16x1/2x0.196
• EZO stainless steel bearing SR3ZZ
• SR3ZZ stainless bearing
• SR3ZZ miniature bearing
• 4.762x12.7x4.978 bearing

FAQ - EZO SR3ZZ

What are the dimensions of EZO SR3ZZ?

The bearing measures 4.762x12.7x4.978 mm, corresponding nominally to 3/16 x 1/2 x 0.196 inch.

Is EZO SR3ZZ a stainless steel bearing?

Yes. SR3ZZ is a stainless steel miniature deep groove ball bearing.

Is SR3ZZ a metric bearing?

No. It belongs to an inch-dimension miniature bearing series.

Does SR3ZZ have a 5 mm bore?

No. The bore diameter is 4.762 mm, corresponding to 3/16 inch.

What does ZZ mean?

ZZ indicates metal shields on both sides of the bearing.

What is the dynamic load rating of EZO SR3ZZ?

The basic dynamic load rating Cr is 1,110 N.

What is the limiting speed of SR3ZZ?

The limiting speed is 51,000 min-1 with grease lubrication and 60,000 min-1 with oil lubrication.

Are SR3ZZ and R3ZZ the same bearing?

No. They share the same basic dimensions, but SR3ZZ is the stainless steel version.

EZO SR3ZZ - key information

EZO SR3ZZ 4.762x12.7x4.978 mm is a miniature inch-series stainless steel deep groove ball bearing with metal shields on both sides. Its 4.762 mm bore corresponds to 3/16 inch. The bearing combines compact dimensions with a shielded, low-friction construction suitable for precision mechanisms based on imperial dimensions.

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