SMR 105 ZZ ZEN 5x10x4 mm Stainless Steel Miniature Bearing

SMR 105 ZZ ZEN 5x10x4 mm Stainless Steel Miniature Bearing

SMR 105 ZZ ZEN is a stainless steel miniature single-row deep groove ball bearing with dimensions 5x10x4 mm. The ZZ design uses metal shields on both sides of the bearing. ZEN specifies stainless steel AISI 440 for the rings and rolling elements, a basic dynamic load rating of 302 N and a basic static load rating of 118 N.

Technical Data - ZEN SMR 105 ZZ

Dimensions

The principal dimensions of ZEN SMR 105 ZZ are:

5x10x4 mm

where:

• d = 5 mm - bore diameter

• D = 10 mm - outside diameter

• B = 4 mm - bearing width

These dimensions are critical when selecting a replacement miniature bearing.

What Does SMR 105 Mean?

SMR 105 belongs to the ZEN range of miniature stainless steel deep groove ball bearings.

The S designation identifies the stainless steel version, while MR refers to the miniature bearing series.

SMR105 has a nominal bore diameter of 5 mm and an outside diameter of 10 mm.

What Does ZZ Mean?

The suffix:

ZZ

indicates that the bearing is equipped with:

metal shields on both sides

The designation 2Z is also commonly used for a bearing shielded on both sides.

For this reason, SMR105-ZZ and SMR105-2Z can be used to describe the double-shielded configuration.

Metal shields help retain lubricant and reduce the ingress of larger contaminants while maintaining low friction.

They should not be confused with contact seals.

Stainless Steel AISI 440

ZEN specifies:

AISI 440 stainless steel

for the bearing rings and rolling elements.

This is an important difference between the stainless SMR105 series and conventional miniature bearings manufactured from standard bearing steel.

Stainless steel construction can provide improved corrosion resistance in suitable operating environments.

However, stainless steel should not be interpreted as being universally resistant to all chemicals, moisture levels or corrosive media. Material compatibility should be checked for aggressive operating environments.

Basic Dynamic Load Rating

ZEN specifies a basic dynamic load rating of:

Cr = 302 N

The basic dynamic load rating is used in calculations of nominal bearing life under dynamic operating conditions.

It should not be interpreted as the maximum permissible load under every operating condition.

Basic Static Load Rating

The basic static load rating is:

C0r = 118 N

This value is relevant when assessing the bearing under static loading or very slow movement.

Radial Clearance

ZEN specifies a radial clearance range of:

0.002-0.013 mm

For precision applications, the required bearing clearance should be considered together with shaft fit, housing fit, operating temperature and actual load conditions.

SMR105 vs MR105

SMR105 and MR105 belong to related miniature bearing series but differ in material.

SMR105

Stainless steel version.

ZEN specifies AISI 440 stainless steel for the rings and rolling elements.

MR105

Standard miniature bearing version manufactured from conventional bearing steel.

Therefore, identical principal dimensions do not automatically mean identical material properties or operating characteristics.

SMR105 ZZ vs SMR105 2RS

The main difference is the bearing closure.

SMR105 ZZ

Metal shields on both sides.

SMR105 2RS

Seals on both sides.

Shielded and sealed bearings should not automatically be considered equivalent for every application.

Selection depends on factors including:

• contamination

• operating speed

• friction requirements

• sealing requirements

• operating environment

SMR105 ZZ vs Open SMR105

This distinction is particularly important.

The open version:

SMR105

has dimensions:

5x10x3 mm

The double-shielded version:

SMR105 ZZ

has dimensions:

5x10x4 mm

Therefore, although both versions have the same 5 mm bore and 10 mm outside diameter, their widths are different.

An open SMR105 should not automatically be substituted for an SMR105 ZZ where the installation requires a 4 mm wide bearing.

Miniature Deep Groove Ball Bearing Design

SMR105 ZZ is a miniature single-row deep groove ball bearing.

With dimensions of only:

5x10x4 mm

it is suitable for compact bearing arrangements where installation space is highly restricted.

Deep groove ball bearings are designed primarily for radial loads and can also accommodate axial loads within the limits of their design and operating conditions.

Metal Shields

The ZZ configuration provides a metal shield on each side of the bearing.

The shields:

• help protect the internal rolling elements

• help retain lubricant

• reduce the ingress of larger contaminants

• operate without the same degree of lip contact associated with contact-sealed designs

For environments with significant contamination, moisture or liquid exposure, the sealing requirements of the application should be assessed separately.

Typical Applications

Miniature stainless steel deep groove ball bearings of this type can be used in appropriately designed:

• miniature electric motors

• precision mechanisms

• measuring equipment

• laboratory equipment

• small gear mechanisms

• automation equipment

• compact drive systems

• instruments

• small mechanical assemblies

Suitability for a specific application depends on actual load, speed, temperature, environment, mounting conditions and required service life.

Selection Checklist

Before ordering ZEN SMR 105 ZZ, verify:

1. Bore diameter - 5 mm.

2. Outside diameter - 10 mm.

3. Required bearing width - 4 mm.

4. Stainless steel construction.

5. Double metal shields - ZZ.

6. Required radial and axial load capacity.

7. Operating speed.

8. Environmental conditions.

9. Required radial clearance.

10. Shaft and housing fits.

The complete designation should always be checked because bearings with similar reference numbers may differ in width, material or closure type.

Installation Considerations

Because SMR105 ZZ is a miniature bearing, particular care should be taken during installation.

Mounting forces should not be transmitted through the rolling elements.

When mounting onto a shaft, force should be applied to the inner ring where appropriate.

When mounting into a housing, force should be applied to the outer ring where appropriate.

Correct shaft and housing tolerances are especially important in miniature bearing arrangements because even small dimensional deviations can influence internal clearance and operating behaviour.

FAQ

What are the dimensions of ZEN SMR 105 ZZ?

The bearing dimensions are:

5x10x4 mm

What is the bore diameter?

The bore diameter is:

5 mm

What is the outside diameter?

The outside diameter is:

10 mm

What is the width?

The double-shielded ZZ version is:

4 mm wide

Is SMR105 ZZ a stainless steel bearing?

Yes. ZEN specifies AISI 440 stainless steel for the rings and rolling elements.

What does ZZ mean?

ZZ indicates metal shields on both sides of the bearing.

Are ZZ and 2RS the same?

No. ZZ refers to metal shields, while 2RS refers to seals on both sides.

What is the dynamic load rating?

ZEN specifies:

Cr = 302 N

What is the static load rating?

ZEN specifies:

C0r = 118 N

What is the radial clearance?

ZEN specifies:

0.002-0.013 mm

Are MR105 and SMR105 identical?

No. SMR105 is the stainless steel version, while MR105 belongs to the standard bearing-steel series.

Is open SMR105 also 4 mm wide?

No. ZEN lists the open SMR105 as 5x10x3 mm, while the SMR105 ZZ version is 5x10x4 mm.

Can SMR105 ZZ replace any 5x10 mm bearing?

No. Bore and outside diameter alone are not sufficient to confirm interchangeability. Width, material, closure type, clearance and operating requirements must also be checked.

ZEN SMR 105 ZZ - Quick Technical Answer

ZEN SMR 105 ZZ is a stainless steel miniature single-row deep groove ball bearing with dimensions 5x10x4 mm and metal shields on both sides. ZEN specifies AISI 440 stainless steel for the rings and rolling elements, a basic dynamic load rating of 302 N and a basic static load rating of 118 N.

ZEN SMR 105 ZZ at simmering.pl

ZEN SMR 105 ZZ is available from simmering.pl, a specialist B2B supplier of miniature bearings, stainless steel bearings, deep groove ball bearings and components for precision and industrial applications.

Stock and technical service are located in Lublin, Poland, with worldwide shipping available.