1-1/4" G25 AISI 52100 Chrome Steel Bearing Balls – 5 Pieces

Introduction

The PGN Bearings 1-1/4" G25 chrome steel balls are suitable for small-batch maintenance and mechanisms that use multiple spherical contact points. With a nominal diameter of 31.75 mm, they provide a substantial format that remains practical for integration into special bearings, valves, support systems, and medium-sized mechanical devices.

Manufactured from AISI 52100 chrome steel, these balls provide the high hardness and good wear resistance associated with the material. Their G25 precision and smooth surfaces support geometric uniformity and consistent contact in compatible assemblies when diameter, clearances, and operating conditions are properly specified.

The five-piece package is useful for maintenance teams, equipment manufacturers, and developers who need to replace several equivalent components or keep spare parts available. Each ball has a listed nominal weight of 4.640 oz, equivalent to approximately 131.552 g.

Hero Product Snippet

Set of five AISI 52100 chrome steel balls, each measuring 1-1/4" (31.75 mm) with G25 precision and a smooth surface finish, for maintenance and compatible industrial mechanisms.

Recommended Applications

• Special industrial bearings
• Valves and control mechanisms
• Support and transfer systems
• Positioning and retention mechanisms
• Movement devices with multiple contact points
• Compatible pneumatic equipment
• Preventive maintenance and component replacement
• Prototypes and small-batch mechanical assemblies

Five-Piece Package for Maintenance

SKU SB-1-1/4-CHROME-G25/5 contains five balls with the same nominal diameter, material, and precision grade. This quantity is convenient for replacing equivalent components at different positions in a machine or keeping a small inventory for future maintenance.

The package can also support prototypes and devices that use several balls. However, the units should not be assumed to form a dimensionally selected or matched set unless that condition is specifically confirmed by the design or supplier.

31.75 mm Diameter

At 1-1/4" in diameter, each ball provides a greater mechanical presence than conventional small balls without reaching the volume and mass of industrial formats above 2". This proportion supports projects seeking a balance between contact area and mounting space.

The metric equivalent is 31.75 mm. Before installation, confirm the dimensions of the track, seat, housing, or mechanism in which the ball will operate.

G25 Precision for Consistent Contact

G25 identifies the precision class of these balls. In general, lower numerical grades provide more refined geometric control than classes such as G100 or G500, although suitability depends on the specification of each machine.

The dimensional uniformity and surface finish associated with G25 can contribute to regular movement and consistent contact points. Verify the required grade before replacing balls manufactured to another standard.

AISI 52100 Chrome Steel Construction

AISI 52100 chrome steel is widely used for balls and mechanical components because of its high hardness and good wear resistance. These properties are appropriate for compatible applications exposed to repeated contact and movement.

Final performance depends on assembly conditions, including load, speed, alignment, lubrication, and adjacent surface materials. The product page does not provide a maximum load rating.

Smooth and Uniform Surface

PGN describes its chrome steel balls as having smooth surfaces without flats, pits, soft spots, or cuts. This condition supports more uniform contact with properly sized tracks, seats, and guides.

During handling, keep the balls separated from tools and abrasive parts. Impacts between the balls or against hard surfaces may leave marks on the finish.

Package Weight and Assembly Planning

Each ball has a listed nominal weight of 4.640 oz, approximately 131.552 g. The five balls represent approximately 657.76 g of combined metal weight, excluding packaging materials.

This information can help with transportation, storage, and handling planning. If the application depends on exact mass or balancing, verify each unit individually.

Chrome Steel Care

AISI 52100 is not stainless steel. To reduce the possibility of oxidation, keep the balls clean, dry, and protected from water, condensation, chemical vapors, and other corrosive agents.

A compatible protective film may be used during storage. Before installation, inspect the surfaces and follow the cleaning procedure appropriate for the equipment.

Key Features

• 1-1/4" (31.75 mm) nominal diameter
• AISI 52100 chrome steel
• G25 precision grade
• Smooth surface finish
• High material-related hardness
• Good wear resistance
• Nominal weight per ball of 4.640 oz, approximately 131.552 g
• Approximate combined ball weight of 657.76 g
• Package containing five pieces
• SKU: SB-1-1/4-CHROME-G25/5

FAQ

What is the diameter of each ball?

Each ball has a nominal diameter of 1-1/4 inches, equivalent to 31.75 mm.

How many balls are included?

SKU SB-1-1/4-CHROME-G25/5 contains five balls.

How much does each ball weigh?

Each unit has a listed nominal weight of 4.640 oz, equivalent to approximately 131.552 g.

Are the five balls supplied as a matched set?

The page confirms the same nominal size, material, and grade, but it does not state that the balls are dimensionally selected or matched. Verify technical requirements when a matched set is necessary.

What does G25 precision mean?

G25 is the precision class of the balls. It represents more refined geometric control than higher numerical grades but must match the equipment specification.

How should the balls be protected from corrosion?

Store them in a clean, dry location protected from moisture and corrosive agents. When appropriate, use a temporary protective product compatible with chrome steel.