Bearing Ball 7.938 mm

Technical Specifications

The dimension 7.938 mm identifies the nominal diameter. Three decimal places do not automatically establish a manufacturing tolerance of 0.001 mm.

Product Designation and Identification

The exact conversion of 5/16 inch is 7.9375 mm, which rounds to 7.938 mm.

This dimensional correspondence does not establish a particular material, precision grade, or manufacturing tolerance.

Construction and Operating Principle

Bearing Ball 7.938 mm has a spherical geometry that enables rolling contact between appropriately designed mating surfaces.

In ball bearings, rolling elements transmit loads between the inner and outer ring raceways while allowing relative rotational movement.

The direction and magnitude of transmitted loads depend on the bearing design, raceway geometry, and operating conditions.

The technical performance of a bearing ball depends on:

• Actual diameter and dimensional tolerance.

• Sphericity and geometric accuracy.

• Surface roughness and finish.

• Material composition.

• Hardness and wear resistance.

• Operating loads and lubrication conditions.

Identical nominal diameters do not automatically guarantee complete interchangeability between rolling elements.

Bearing Ball 7.938 mm vs 5/16 Inch

The nominal diameter of 7.938 mm corresponds to 5/16 inch after rounding.

The difference of 0.0005 mm equals 0.5 micrometres and results from rounding the exact imperial conversion.

For applications requiring high precision, the actual diameter tolerance and precision grade must be verified.

Bearing Ball 7.938 mm vs 8.000 mm

Bearing balls measuring 7.938 mm and 8.000 mm are not direct dimensional substitutes.

The difference may affect bearing clearance, contact geometry, and load distribution.

Material and Manufacturing Accuracy

The material of this bearing ball has not been specified.

Depending on the application, bearing balls may be manufactured from bearing steel, stainless steel, or engineering ceramics.

A particular material, steel grade, hardness, or precision classification must not be assigned without supporting product documentation.

For precision applications, verify:

• Material composition.

• Diameter tolerance.

• Deviation from spherical form.

• Surface roughness.

• Hardness.

• Dimensional consistency within the supplied batch.

The required characteristics depend on the mechanical assembly and its operating conditions.

Bearing Selection and Interchangeability

Before purchasing Bearing Ball 7.938 mm, verify the technical requirements of the application.

Important selection criteria include:

• Nominal diameter: 7.938 mm.

• Corresponding imperial dimension: 5/16 inch.

• Diameter tolerance: Compliance with the required specification.

• Material: Compatibility with operating conditions.

• Precision grade: Appropriate dimensional and geometric accuracy.

• Hardness: Suitability for contact loads and mating surfaces.

• Surface quality: Absence of scratches, dents, corrosion, and other defects.

• Operating loads: Compatibility with the mechanical assembly.

• Operating temperature: Suitability for the application.

• Lubrication: Appropriate for the bearing or mechanism.

When replacing balls in an existing bearing, assess the condition of the raceways, cage, and remaining rolling elements.

Replacing an individual ball without checking the complete assembly may result in uneven load distribution.

Applications of Bearing Ball 7.938 mm

Bearing balls with a nominal diameter of 7.938 mm may be used in mechanical assemblies specifically designed for spherical rolling elements of this size.

Typical application categories include:

• Ball bearings designed for 5/16-inch rolling elements.

• Industrial rolling mechanisms.

• Mechanical guiding systems.

• Ball-based positioning mechanisms.

• Other engineered assemblies incorporating spherical rolling elements.

These are general application categories based on the geometry and function of bearing balls.

They do not establish confirmed compatibility with a particular bearing model, machine, gearbox, or OEM assembly.

Suitability must be verified against the technical requirements of the application.

Alternative Designations and Reference Formats

Natural reference formats include:

• Bearing Ball 7.938 mm

• Bearing Ball 5/16 inch

• 5/16" Bearing Ball

• Bearing Ball 7.938 mm - 100 pcs.

These are alternative descriptive and dimensional formats, not confirmed manufacturer or OEM part numbers.

No unverified manufacturer references, material grades, or precision classifications have been assigned.

Handling, Installation and Storage

Before installation, inspect the bearing ball and all mating surfaces for contamination, damage, or corrosion.

Do not use balls with visible dents, scratches, deformation, or surface defects.

Protect the rolling elements against moisture, abrasive particles, and mechanical damage.

When assembling a bearing, ensure that all balls meet the required dimensional and material specifications.

Use the lubricant recommended for the complete mechanical assembly.

Store the balls in clean, dry conditions, preferably in their original packaging.

Frequently Asked Questions - FAQ

What is the diameter of Bearing Ball 7.938 mm?

The nominal diameter is 7.938 mm, corresponding to 5/16 inch after rounding.

Is a 7.938 mm bearing ball the same as a 5/16-inch ball?

They represent corresponding nominal dimensions after rounding. The exact conversion of 5/16 inch is 7.9375 mm.

Can a 7.938 mm ball replace an 8 mm ball?

Not automatically. The nominal diameter difference is 0.062 mm.

What material is the bearing ball made from?

The material has not been specified. It must be confirmed against the technical specification of the particular product.

Does 7.938 mm mean the ball is accurate to 0.001 mm?

No. The number of decimal places in the nominal dimension does not establish the manufacturing tolerance.

Does the ball have a specified precision grade?

No precision grade has been provided. It must be verified before using the ball in a precision mechanical assembly.

Can this ball be used to repair an existing bearing?

Only if its diameter, material, hardness, precision grade, and other characteristics match the bearing requirements.

How many bearing balls are included in one package?

Each package contains 100 bearing balls with a nominal diameter of 7.938 mm.

Bearing Ball 7.938 mm - Key Technical Information

Bearing Ball 7.938 mm is a spherical rolling element with a nominal diameter corresponding to 5/16 inch after rounding. It is supplied in packages of 100 pieces and intended for compatible ball bearings and mechanical rolling assemblies. Correct selection requires verification of material, precision grade, hardness, and dimensional tolerance.

Bearing Balls at simmering.pl

Bearing balls, rolling bearings, and industrial mechanical components are available through simmering.pl, a specialist B2B trading platform serving industrial companies, engineers, maintenance departments, and technical purchasing teams.

Our warehouse and order processing facilities are located in Lublin, Poland. We provide worldwide shipping from stock in Poland.

Product identification and selection assistance is available based on technical dimensions and application requirements.