2-1/2" G25 AISI 52100 Chrome Steel Bearing Ball – 1 Piece

Introduction

The PGN Bearings 2-1/2" G25 chrome steel ball combines a substantial industrial diameter with a precision class intended for mechanical assemblies requiring consistent geometry and a uniform surface finish. Measuring 2-1/2 inches, or 63.5 mm, this solid ball can be integrated into devices, tracks, supports, and mechanisms specifically sized for large spherical components.

Manufactured from AISI 52100 chrome steel, the ball provides the high hardness and good wear resistance associated with this material. These properties are valuable in compatible applications exposed to mechanical contact, concentrated pressure, or repeated movement, provided the product is used within the conditions established by the design.

Supplied as one piece, this 63.5 mm G25 ball is suitable for individual replacements, special-purpose projects, functional prototypes, and low-volume industrial assemblies. Selection should account for the diameter, precision grade, component weight, retention method, and operating environment.

Hero Product Snippet

Solid 2-1/2" (63.5 mm) AISI 52100 chrome steel ball with G25 precision and a smooth surface, supplied as one piece for industrial mechanisms and special mechanical projects.

Recommended Applications

• Mechanical assemblies designed for 63.5 mm balls
• Industrial positioning and retention mechanisms
• Compatible support and transfer devices
• Specially designed valves and control mechanisms
• Assembly fixtures and custom tooling
• Special-purpose equipment and functional prototypes
• Automation projects using spherical contact
• Replacement in assemblies specified for a 2-1/2" G25 ball

Large Format with a Manageable Footprint

The 2-1/2" diameter places this ball within the large-format industrial component category. At 63.5 mm, it provides a broad contact surface for mechanisms, supports, and devices engineered around its spherical geometry.

At the same time, it is more compact and lighter than 3" or 3-1/2" industrial balls, which may simplify integration in projects with controlled mounting space. Dimensional compatibility must be verified before ordering.

G25 Precision for Mechanical Assemblies

G25 is the precision grade listed for this ball. In general, lower numerical grades represent more refined geometric control than broader classes such as G100 or G500, although the required specification always depends on the equipment.

G25 precision can contribute to consistent contact and uniform movement in properly designed mechanisms. For replacement applications, compare the grade, diameter, and material with the original assembly documentation.

AISI 52100 Chrome Steel Construction

AISI 52100 chrome steel is widely recognized for its high hardness and good resistance to wear. These characteristics support its use in mechanical components exposed to repeated contact, friction, and movement cycles.

Final performance depends on operating conditions, contact type, lubrication, and equipment alignment. The ball should not be selected by size alone when the application has defined load, speed, or environmental requirements.

Smooth Surface for Consistent Contact

The smooth surface helps promote uniform contact in compatible tracks, seats, supports, and mechanisms. PGN describes its chrome steel balls as free from surface defects such as flats, pits, soft spots, and cuts.

To preserve the finish, avoid drops, impacts, and abrasive contact during transportation and installation. Surface marks may affect applications that depend on rolling, sealing, or controlled mechanical contact.

Single-Piece Package for Replacement and Development

SKU SB-2-1/2-CHROME-G25/1 corresponds to the one-piece package. This option is convenient for individual replacements, prototype development, fit testing, and projects that do not require larger quantities.

The product page lists a nominal weight of 37.1 oz, equivalent to approximately 1.052 kg. This mass should be considered when planning handling, support, and ball-retention methods.

Chrome Steel Protection

AISI 52100 chrome steel does not provide the same corrosion resistance as stainless steel. To help prevent oxidation, store the ball in a clean, dry location protected from moisture and corrosive substances.

When compatible with the process, an appropriate protective film may be used during storage. Before installation, inspect the surface and determine whether the protective product must be removed.

Key Features

• 2-1/2" (63.5 mm) nominal diameter
• AISI 52100 chrome steel construction
• G25 precision grade
• Smooth and uniform surface
• High material-related hardness
• Good wear resistance
• Nominal weight of 37.1 oz, approximately 1.052 kg
• Supplied as one piece
• Suitable for dimensionally compatible industrial projects
• SKU: SB-2-1/2-CHROME-G25/1

FAQ

What is the diameter of this ball?

The nominal diameter is 2-1/2 inches, equivalent to 63.5 mm.

How many balls are included?

This variation, identified by SKU SB-2-1/2-CHROME-G25/1, contains one ball.

How much does the ball weigh?

The listed nominal weight is 37.1 oz, equivalent to approximately 1.052 kg. Confirm the actual unit weight if the project depends on an exact mass.

What does G25 mean?

G25 is the ball’s precision grade. It represents more refined geometric control than higher numerical grades, but compatibility must be checked against the equipment specifications.

Can this ball replace any other 2-1/2" ball?

Not necessarily. In addition to diameter, verify the material, precision grade, surface condition, and operating requirements of the original assembly.

Can this chrome steel ball be used in wet environments?

AISI 52100 chrome steel may oxidize when exposed to moisture. For wet or corrosive environments, consider suitable protection or a ball manufactured from a more appropriate material.