Steel Bearing Ball 4.00 mm - 100 pcs.

Technical Specifications - Steel Bearing Ball 4.00 mm

The nominal diameter of 4.00 mm does not independently establish the manufacturing tolerance or precision grade.

The exact steel grade, heat treatment, hardness and surface finish have not been confirmed. These properties should be verified when selecting balls for precision bearing assemblies.

What Does Steel Bearing Ball 4.00 mm - 100 pcs. Mean?

Steel Bearing Ball - Product Type

A steel bearing ball is a spherical component used as a rolling element in bearings and other mechanical mechanisms.

In a conventional ball bearing, the balls operate between the inner and outer ring raceways, allowing relative rotational movement while transmitting mechanical loads.

Unlike a complete rolling bearing, a loose bearing ball does not include bearing rings, seals, shields or a cage.

4.00 mm - Nominal Diameter

The value 4.00 mm identifies the nominal diameter of the ball.

This dimension is essential when selecting replacement rolling elements or designing a mechanism that requires a specific ball size.

However, the nominal diameter alone does not define the permitted dimensional variation.

For precision applications, the actual diameter tolerance and spherical accuracy must also be considered.

Steel - Material Identification

The product is identified as a steel bearing ball.

Steel balls may be manufactured from different materials depending on the intended application.

Common bearing ball materials include chrome bearing steel and stainless steel, but neither material can be assigned to this specific product without confirmation.

The designation steel also does not establish whether the ball has been hardened or what hardness value it achieves.

100 pcs. - Package Quantity

The product is supplied in a package containing 100 steel bearing balls with a nominal diameter of 4.00 mm.

The quantity refers to the number of individual loose balls, not complete bearings.

Construction and Operating Principle

Spherical Rolling Element

The bearing ball has a nominal diameter of 4.00 mm and a spherical geometry.

When used in a rolling bearing, it operates between specially shaped raceways.

The ball transmits forces through small contact areas, where elastic deformation occurs under load.

The actual contact conditions depend on the load, raceway geometry, material properties and lubrication.

Rolling Contact

During bearing operation, the balls roll along the raceways while allowing the bearing rings to rotate relative to one another.

Rolling contact generally produces less friction than direct sliding contact under suitable operating conditions.

The resulting friction, wear and service life depend on the complete bearing design rather than the ball diameter alone.

Surface Quality

The surface condition of a bearing ball is important for reliable rolling contact.

Relevant characteristics include:

• Surface roughness.

• Sphericity.

• Diameter variation.

• Surface defects.

• Material hardness.

• Cleanliness.

Scratches, indentations and contamination may increase local contact stresses and accelerate wear.

Material and Hardness

Steel bearing balls can be manufactured from different steel grades and may undergo heat treatment to achieve specified mechanical properties.

For this 4.00 mm product, the exact material grade and hardness have not been verified.

It should therefore not automatically be described as AISI 52100, 100Cr6, hardened chrome steel or stainless steel.

Precision Grades of Steel Bearing Balls

Steel balls intended for rolling bearings may be classified according to ISO 3290-1.

Precision grades define requirements for geometric accuracy and surface characteristics.

Depending on the specified grade, relevant properties include:

• Diameter variation.

• Deviation from spherical form.

• Surface roughness.

• Lot diameter variation.

Examples of bearing ball precision grades include G10, G20, G40 and G100.

The precision grade of this Steel Bearing Ball 4.00 mm has not been confirmed.

A specific grade must not be assigned without supporting technical documentation.

The correct nominal diameter alone does not guarantee suitability for a precision bearing.

Steel Bearing Ball 4.00 mm vs 5/32 Inch

The 4.00 mm metric diameter is close to, but not identical with, the imperial dimension 5/32 inch.

The difference between these sizes is 31.25 micrometres.

This difference may be significant in precision bearing assemblies.

Therefore, a 5/32 inch ball should not automatically be used as a replacement for a 4.00 mm ball.

Interchangeability must be determined from the original assembly specifications and permitted tolerances.

Alternative Designations and Reference Sizes

The product may appear under the following notation variants:

• Steel Bearing Ball 4.00 mm

• 4 mm Steel Bearing Ball

• Steel Ball 4 mm

• Bearing Ball 4.00 mm - 100 pcs.

• 4 mm Steel Balls - 100 pcs.

• Precision Steel Ball 4 mm

The last expression is a descriptive search variant only; a specific precision grade has not been established.

No manufacturer part numbers or OEM cross-references have been confirmed for this product.

Bearing Ball Selection and Interchangeability

Before purchasing 4.00 mm steel bearing balls, verify the requirements of the intended mechanical assembly.

Important selection criteria include:

1. Nominal ball diameter.

2. Required dimensional tolerance.

3. Precision grade.

4. Steel grade.

5. Material hardness.

6. Surface finish.

7. Operating load.

8. Operating speed.

9. Lubrication conditions.

10. Corrosion resistance requirements.

11. Compatibility with the existing raceways.

12. Quantity required for the assembly.

Replacement of Rolling Elements

Replacing balls in an existing bearing requires careful verification of the original bearing specifications.

Manufacturers may use balls selected within narrow diameter groups to achieve the required internal geometry and load distribution.

Installing balls of different sizes or precision grades can cause uneven loading, increased vibration and premature wear.

For this reason, nominal diameter alone is insufficient to confirm suitability for bearing repair.

Typical Applications

Steel bearing balls with a nominal diameter of 4.00 mm may be used in appropriately designed mechanical assemblies, including:

• Ball bearings with replaceable rolling elements.

• Mechanical ball mechanisms.

• Positioning and adjustment mechanisms.

• Ball detent mechanisms.

• Selected linear motion assemblies.

• Mechanical components requiring spherical steel elements.

These examples describe typical applications of steel balls as a product category.

They do not represent confirmed applications of this exact product in a particular bearing or machine model.

Suitability depends on the required material, precision grade, hardness, dimensional tolerance and operating conditions.

Installation, Handling and Storage

Cleanliness

Bearing balls should be handled in a clean environment.

Dust, metal particles and other contaminants may damage the ball surfaces and mating components during operation.

Surface Protection

Avoid impacts, scratches and contact with abrasive materials.

Balls showing visible damage, corrosion or surface defects should not be installed in precision rolling mechanisms.

Dimensional Verification

For precision applications, verify the ball diameter using suitable calibrated measuring equipment.

The required measurement method depends on the specified tolerance and precision grade.

Lubrication

When used as rolling elements, steel balls generally require lubrication suitable for the surrounding mechanical assembly.

The lubricant should be selected according to load, speed, operating temperature and material compatibility.

Storage

Store the balls in a clean, dry environment.

Protect them from moisture, contamination and mechanical damage.

Corrosion resistance should not be assumed unless the steel grade has been confirmed.

FAQ - Steel Bearing Ball 4.00 mm

1. What is the diameter of the steel bearing ball?

The nominal diameter is 4.00 mm.

2. How many balls are included in one package?

One package contains 100 steel bearing balls.

3. Are these balls made from AISI 52100 or 100Cr6 bearing steel?

The exact steel grade has not been confirmed. These materials should not be assigned to the product without manufacturer documentation.

4. Are the 4 mm steel balls hardened?

The heat treatment and hardness of this specific product have not been specified.

5. What precision grade do these balls have?

The precision grade has not been confirmed. It cannot automatically be classified as G10, G20, G100 or another grade.

6. Can these balls be used to repair a ball bearing?

Only if their diameter, tolerance, steel grade, hardness and precision grade meet the requirements of the original bearing.

7. Are 4 mm balls interchangeable with 5/32 inch balls?

Not automatically. A 5/32 inch ball measures 3.96875 mm, which is 0.03125 mm smaller than a 4.00 mm ball.

8. Are these steel balls stainless?

Stainless steel construction has not been confirmed. The description steel does not automatically indicate corrosion resistance.

Steel Bearing Ball 4.00 mm - Key Technical Information

Steel Bearing Ball 4.00 mm - 100 pcs. consists of 100 spherical steel rolling elements with a nominal diameter of 4 mm. These balls can be used in suitably designed bearing assemblies and mechanical ball mechanisms. Correct selection requires verification of steel grade, hardness, diameter tolerance and precision grade. The metric 4 mm size is not identical to 5/32 inch.

Steel bearing balls are available from simmering.pl, a specialist supplier of rolling bearings, industrial seals and mechanical components.

TG Ersatzteile Polska Sp. z o.o. operates a warehouse in Lublin, Poland, serving industrial companies, maintenance departments, workshops and international B2B customers.

Products are shipped from stock in Poland, with shipping options available throughout Europe and worldwide.