Technical Specifications - Steel Bearing Ball 28.575 mm

The diameter of 28.575 mm is an exact metric equivalent of 1 1/8 inch.

However, the nominal diameter does not determine the manufacturing tolerance, hardness or precision grade.

The exact steel grade, heat treatment and surface characteristics have not been confirmed for this product.

Product Designation Explained

Steel Bearing Ball - Product Type

A steel bearing ball is a spherical rolling element used in ball bearings and suitably designed 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.

A loose bearing ball is not a complete bearing and does not include bearing rings, a cage, seals or shields.

28.575 mm - Nominal Diameter

The value 28.575 mm identifies the nominal diameter of the ball.

This dimension corresponds exactly to the imperial size 1 1/8 inch:

1.125 x 25.4 mm = 28.575 mm.

Both designations refer to the same nominal diameter.

However, the permitted dimensional tolerance and precision requirements must also be considered when selecting replacement rolling elements.

Steel - Material Identification

The product is identified as a steel bearing ball.

Steel balls may be manufactured from different steel grades depending on their intended application.

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

The exact steel grade, hardness and corrosion resistance require verification.

100 pcs. - Package Quantity

Each package contains 100 individual steel bearing balls with a nominal diameter of 28.575 mm.

The package quantity does not establish the material properties or precision grade.

Construction and Operating Principle

Spherical Geometry

The bearing ball has a nominal diameter of 28.575 mm and a spherical shape.

When used in a rolling bearing, it operates between appropriately designed raceways.

Mechanical loads are transmitted through relatively small contact areas, where elastic deformation occurs under operating conditions.

The resulting contact stresses depend on the load, raceway geometry and material properties.

Rolling Contact

During bearing operation, the balls roll along the raceways while allowing relative rotation between the bearing rings.

Rolling contact reduces sliding friction compared with direct sliding movement under suitable conditions.

The actual friction, wear and service life depend on the complete bearing design, operating load, speed and lubrication.

Surface Quality

Important characteristics of steel bearing balls include:

• Diameter accuracy.

• Deviation from spherical form.

• Surface roughness.

• Diameter consistency within a production batch.

• Material hardness.

• Surface integrity.

• Cleanliness.

These properties cannot be determined from the nominal diameter alone.

Steel Grade and Hardness

Steel bearing balls may be manufactured from different materials depending on their mechanical and environmental requirements.

For example, 100Cr6 (AISI 52100) is a commonly used bearing steel.

However, the exact steel grade of this 28.575 mm product has not been confirmed.

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

Similarly, no specific Rockwell hardness value or heat treatment specification can be assigned without manufacturer documentation.

Precision Grades of Steel Bearing Balls

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

This standard covers dimensional and geometric characteristics of steel bearing balls.

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

Precision grades define requirements related to characteristics such as diameter variation, spherical accuracy and surface roughness.

The precision grade of Steel Bearing Ball 28.575 mm has not been confirmed.

A particular grade should not be assigned without technical documentation.

Identical nominal diameters do not automatically guarantee interchangeability between balls of different precision grades.

Steel Bearing Ball 28.575 mm vs 1 1/8 Inch

The metric and imperial dimensions are exactly equivalent.

However, interchangeability requires more than matching nominal diameters.

The actual diameter tolerance, steel grade, hardness and precision grade must also meet the requirements of the intended assembly.

Alternative Designations and Reference Sizes

The product may be identified using the following notation variants:

• Steel Bearing Ball 28.575 mm

• 28.575 mm Steel Bearing Ball

• Steel Ball 28.575 mm

• Steel Bearing Ball 1 1/8 inch

• Steel Ball 1-1/8 inch

• Bearing Ball 1.125 inch

• Steel Bearing Balls 28.575 mm - 100 pcs.

These are alternative dimensional descriptions, not confirmed manufacturer part numbers or OEM cross-references.

Selection and Interchangeability

Before purchasing steel bearing balls with a nominal diameter of 28.575 mm, verify the following parameters:

1. Nominal diameter.

2. Permitted diameter tolerance.

3. Required precision grade.

4. Steel grade.

5. Material hardness.

6. Surface finish.

7. Operating load.

8. Operating speed.

9. Lubrication requirements.

10. Corrosion resistance requirements.

11. Compatibility with existing raceways.

12. Required quantity of rolling elements.

Replacement of Balls in Existing Bearings

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

Bearing manufacturers may use balls selected within narrow dimensional groups to achieve the required internal geometry and load distribution.

Installing balls with different actual diameters, hardness values or precision grades may cause uneven loading, increased vibration and premature wear.

The condition of the raceways and cage should also be assessed before replacing rolling elements.

Matching the nominal diameter of 28.575 mm or 1 1/8 inch does not guarantee complete technical interchangeability.

Typical Applications

Steel bearing balls with a nominal diameter of 28.575 mm may be used in suitably designed mechanical assemblies, including:

• Ball bearings with replaceable rolling elements.

• Mechanical ball mechanisms.

• Positioning mechanisms.

• Selected guiding assemblies.

• Industrial mechanical systems requiring spherical steel components.

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

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

Suitability must be established from the required material properties, precision grade, dimensional tolerance and operating conditions.

Installation, Handling and Storage

Cleanliness During Installation

Bearing balls should be handled in a clean environment.

Dust, metal particles and other contaminants may damage the rolling surfaces and accelerate wear.

Surface Protection

Avoid impacts, scratches and direct contact with abrasive materials.

Balls showing visible indentations, 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 measurement procedure should correspond to the required tolerance and precision grade.

Lubrication

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

Lubricant selection should account for operating load, speed, 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 28.575 mm

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

The nominal diameter is 28.575 mm.

2. Is 28.575 mm exactly equivalent to 1 1/8 inch?

Yes. The imperial size 1 1/8 inch equals exactly 28.575 mm.

3. How many balls are included in one package?

Each package contains 100 steel bearing balls.

4. Are these balls manufactured from AISI 52100 or 100Cr6 steel?

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

5. Are the 28.575 mm steel balls hardened?

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

6. What precision grade do these bearing balls have?

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

7. Are 28.575 mm balls interchangeable with 1 1/8 inch balls?

The nominal diameters are identical. However, interchangeability requires matching diameter tolerances, material properties, hardness and precision grades.

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

Only if their technical characteristics meet the original bearing requirements. The nominal diameter alone is insufficient to confirm suitability.

Steel Bearing Ball 28.575 mm - Key Technical Information

Steel Bearing Ball 28.575 mm - 100 pcs. contains 100 spherical steel rolling elements with a nominal diameter of 28.575 mm, exactly equivalent to 1 1/8 inch. These balls may be used in appropriately designed bearings and mechanical assemblies. Correct selection requires verification of steel grade, hardness, dimensional tolerance and precision grade. Matching nominal dimensions alone does not guarantee interchangeability.

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.