Special size bearings

Special Size Bearings – Custom Bearing Solutions from Taiwan

Standard bearings are available in many established dimensions, but not every mechanical system can use a conventional catalogue size. Existing shaft diameters, housing dimensions, restricted installation space, special mounting structures, or unique OEM product designs may require special size bearings developed around the actual application.

Special-size bearings can provide a practical solution when a standard bearing has the correct basic function but does not fit the required dimensions. Instead of redesigning an entire machine or product, customers can evaluate whether the bearing itself can be customized.

HSIAN JI BEARING CO., LTD. is a bearing manufacturer based in Taiwan. Established in 1995, we manufacture and develop ball bearings, plastic bearings, thrust bearings, stamped bearings, slide bearings, special bearings, and non-standard bearings.

For customers requiring special size bearings, HSIAN JI can evaluate projects according to technical drawings, physical samples, dimensions, materials, application requirements, and production quantities.

What Are Special Size Bearings?

Special size bearings are bearings manufactured or developed with dimensions that differ from commonly available standard catalogue products.

Customization may involve:

Inner diameter
Outer diameter
Bearing width
Overall thickness
Flange diameter
Flange thickness
Shaft dimensions
Housing dimensions
Mounting dimensions
External geometry

The objective is to produce a bearing that fits the customer's mechanical system while meeting the required functional and manufacturing conditions.

Why Are Special Size Bearings Needed?

Mechanical products are often designed around existing components, fixed spaces, or unique structural requirements.

A standard bearing may be unsuitable because:

The shaft diameter is non-standard
The housing diameter cannot be changed
The available space is too narrow
A special width is required
The product uses a unique mounting structure
An older machine uses an obsolete bearing
A replacement bearing is difficult to source
An OEM design requires a dedicated component

In these situations, special size bearings can be evaluated as an alternative to modifying the entire assembly.

Special Inner Diameter Bearings

The inner diameter is one of the most important dimensions in a bearing because it determines how the bearing fits onto a shaft.

A customer may have a shaft size that does not correspond to a standard bearing.

In this situation, a special inner diameter may be considered.

Customers should provide:

Exact shaft diameter
Required bearing inner diameter
Outer diameter
Width
Housing dimensions
Installation information
Load
Speed

Changing the inner diameter can influence the complete bearing structure, so all dimensions should be evaluated together.

Special Outer Diameter Bearings

The outer diameter determines how the bearing fits into a housing, wheel, bracket, roller, or surrounding structure.

Some equipment uses a fixed housing dimension that cannot easily be modified.

A special outside diameter may therefore be required.

Customers should provide the actual housing dimensions and, whenever possible, an assembly drawing showing how the bearing is installed.

Special Width Bearings

A standard bearing may have the correct inner and outer diameters but still be too wide or too narrow for the application.

Special-width bearings can be useful when installation space is limited or when the bearing must align precisely with surrounding components.

Width should not be considered independently, because changing bearing width may influence:

Internal structure
Assembly
Load distribution
External geometry
Manufacturing feasibility

A complete technical drawing is recommended.

Special Flange Size Bearings

Some bearing applications require a flange for positioning, retention, or mounting.

Standard flange dimensions may not match every assembly.

Special flange requirements may involve:

Flange diameter
Flange thickness
Bearing body diameter
Overall width
Mounting relationship

Customers should provide a detailed drawing showing both bearing and flange dimensions.

Special Size Ball Bearings

Ball bearings are widely used in rotational applications.

A special-size ball bearing may be required when standard models cannot match the customer's:

Bore size
Outside diameter
Width
Shaft
Housing
Mounting arrangement

HSIAN JI manufactures ball bearing products and can evaluate customized dimensions according to application and manufacturing feasibility.

Special Size Plastic Bearings

Plastic bearings can provide useful characteristics such as lightweight construction, corrosion resistance, reduced noise, moisture resistance, and design flexibility.

Special-size plastic bearings can also be developed for applications requiring non-standard dimensions.

Customers should provide information about:

Plastic material requirements
Load
Speed
Temperature
Moisture
Chemicals
Movement
Installation conditions

The material and dimensional requirements should be evaluated together.

Special Size Thrust Bearings

Thrust bearings are primarily designed to support axial loads.

A special-size thrust bearing may be required when standard products cannot fit the shaft or installation space.

Customization may involve:

Inner diameter
Outer diameter
Thickness
Washer dimensions
Overall structure

Customers should provide axial-load information, operating speed, materials, and installation requirements.

Special Size Slide Bearings

Slide bearings support and guide linear or sliding movement.

Special-size slide bearings may be required when a standard product cannot fit the customer's rail, guide, frame, bracket, or housing.

Assembly drawings can be particularly useful for slide-bearing projects because they show the complete movement system.

Special Size Stamped Bearings

Stamped bearings can be used in various mechanical, furniture, hardware, and equipment applications.

Special-size requirements can involve:

Custom stamped dimensions
Unique metal structures
Mounting features
External geometry
Application-specific configurations

Customers can provide drawings or physical samples for evaluation.

Special Size Bearings Based on Engineering Drawings

Engineering drawings provide the most efficient way to communicate customized bearing dimensions.

Customers should provide:

2D technical drawings
3D CAD models
Assembly drawings
Critical dimensions
Required tolerances
Materials
Mounting features

An assembly drawing helps the manufacturer understand how the bearing interacts with:

Shafts
Housings
Rollers
Rails
Wheels
Brackets
Frames
Other components

This helps reduce ambiguity during development.

Special Size Bearings from Physical Samples

Sometimes customers have an existing bearing but no technical drawing.

This is common with:

Older machinery
Imported equipment
Discontinued components
Existing OEM products
Specialized mechanical systems

A physical sample can provide useful dimensional and structural information.

HSIAN JI can evaluate product development according to customer requirements and samples.

However, customers should also provide information about application, materials, load, speed, environment, and required quantity whenever possible.

Replacement Special Size Bearings

Replacement is one of the most common reasons customers require special dimensions.

An existing machine may use a bearing that is:

No longer available
Difficult to source
No longer produced by the original supplier
Unique to the original machine
Based on an obsolete design

If a standard replacement does not fit, a special-size bearing may be evaluated.

Customers should provide the original bearing, shaft dimensions, housing dimensions, machine information, and operating requirements.

Obsolete Bearing Replacement

Industrial equipment can remain in service for many years.

During that time, the original bearing model may become obsolete.

Replacing an entire machine because one bearing is unavailable may not be practical.

Where technically feasible, developing a replacement based on the original component and application may provide another option.

Special Size Bearings for OEM Applications

OEM manufacturers often design products with unique internal dimensions.

The bearing may need to fit within:

Limited installation space
A custom housing
A dedicated shaft
A compact product structure
A specialized mechanical layout

Using a standard bearing can sometimes restrict product design.

Customized dimensions provide additional flexibility.

OEM customers should provide:

Engineering drawings
Assembly drawings
Critical dimensions
Material requirements
Initial quantity
Estimated annual demand
Quality requirements

Prototype Special Size Bearings

Prototype development is especially useful when dimensions are customized.

A prototype allows the customer to verify:

Inner diameter
Outer diameter
Width
Mounting
Fit
Installation
Assembly compatibility
Mechanical movement

If modifications are necessary, they can be evaluated before regular production.

Precision and Tolerances for Special Size Bearings

Custom dimensions often require clearly defined tolerances.

Customers should specify only the dimensions that are critical to fit and function.

Important tolerance requirements may involve:

Bore size
Outside diameter
Width
Flange dimensions
Mounting positions
Other critical geometry

The achievable tolerance depends on the bearing design, material, manufacturing process, and size.

Customers should identify required tolerances on the engineering drawing for evaluation.

Quality Control for Special Size Bearings

Quality management is important because customized dimensions must remain consistent between production batches.

Quality control can include:

Raw material control
Manufacturing process control
Dimensional inspection
Product testing
Finished-product inspection
Production monitoring
Packaging inspection
Continuous improvement

Approved drawings and samples can provide references for repeat production.

Low Volume Special Size Bearings

Not every special-size project requires large quantities.

Customers may require lower quantities for:

Prototype equipment
Replacement parts
Specialized machinery
Product development
Initial OEM orders

Production feasibility depends on design, material, tooling, process, and quantity.

Customers should provide both the initial requirement and expected future demand.

Mass Production of Special Size Bearings

After the design and sample are approved, production can be evaluated for recurring or larger quantities.

OEM customers should provide:

Initial order quantity
Estimated annual demand
Production forecasts
Order frequency
Packaging requirements
Delivery requirements

Clear production information can help with long-term supply planning.

Applications for Special Size Bearings

Depending on the bearing type and specification, special size bearings can be used in:

Industrial machinery
Conveyors
Automation equipment
Packaging machinery
Medical equipment
Office equipment
Furniture systems
Sliding doors
Windows
Hardware products
Transportation products
Fitness equipment
Sporting goods
Scooters
Skates
Specialized OEM products

The appropriate bearing should always be evaluated according to actual application requirements.

Why Choose Special Size Bearings from Taiwan?

Taiwan has a mature manufacturing ecosystem supporting bearings, precision components, machinery, metalworking, plastics, hardware, tooling, and OEM production.

For international customers, working with a Taiwan manufacturer can be useful when a project requires custom dimensions, technical communication, prototype development, quality control, and repeat production.

HSIAN JI has been involved in bearing development and manufacturing in Taiwan since 1995.

HSIAN JI – Special Size Bearings from Taiwan

If standard catalogue dimensions cannot meet your mechanical requirements, HSIAN JI welcomes your inquiry.

Our product range includes ball bearings, plastic bearings, thrust bearings, stamped bearings, slide bearings, special bearings, and non-standard bearings.

For a special size bearings project, provide:

Technical drawings
CAD models
Physical samples
Inner diameter
Outer diameter
Width
Material requirements
Required tolerances
Load
Speed
Application
Operating environment
Initial quantity
Estimated annual demand

HSIAN JI can evaluate your requirements and discuss an appropriate special-size bearing development and manufacturing solution.

Special Size Bearings FAQ

What are special size bearings?

Special size bearings are bearings with dimensions that differ from commonly available standard catalogue products.

The customized dimensions may involve inner diameter, outer diameter, width, thickness, flange dimensions, mounting dimensions, or other geometry.

When do I need a special size bearing?

You may need a special-size bearing when a standard bearing cannot fit your shaft, housing, installation space, or mechanical structure.

Other common reasons include obsolete bearings, replacement projects, unique OEM designs, and special machinery.

Can HSIAN JI develop special size bearings?

HSIAN JI can evaluate customized bearing projects according to customer drawings, physical samples, dimensions, application requirements, and production quantities.

The feasibility of the required size depends on bearing type, material, structure, process, and quantity.

Can the inner diameter be customized?

Special inner diameters can be evaluated when the bearing needs to fit a non-standard shaft.

Customers should provide the shaft diameter together with outer diameter, width, housing dimensions, load, speed, and installation requirements.

Can the outer diameter be customized?

Special outer diameters can be evaluated when a bearing must fit a custom housing, roller, bracket, or limited installation space.

Housing dimensions and assembly drawings can help clarify the requirement.

Can bearing width be customized?

Yes, special-width requirements can be submitted for evaluation.

The complete bearing design should be considered because width may influence internal structure and manufacturing feasibility.

Can flange dimensions be customized?

Special flange dimensions can be evaluated depending on the bearing structure.

Customers should provide flange diameter, flange thickness, body dimensions, mounting arrangement, and application information.

Can you manufacture special size ball bearings?

HSIAN JI manufactures ball bearing products.

Special-size ball bearing requirements can be evaluated according to bore size, outside diameter, width, shaft and housing dimensions, load, speed, and quantity.

Can you manufacture special size plastic bearings?

HSIAN JI manufactures plastic bearings.

Custom-size plastic bearing projects should include dimensional requirements, material, load, speed, temperature, moisture, chemicals, and operating environment.

Can you manufacture special size thrust bearings?

Thrust bearing requirements can be customized according to technical and manufacturing feasibility.

Customers should provide inner diameter, outer diameter, thickness, axial load, speed, materials, and installation information.

Can you manufacture special size slide bearings?

HSIAN JI manufactures slide bearings.

Customized slide bearing dimensions can be evaluated according to the rail, guide, frame, movement, mounting structure, load, and application.

Can you manufacture special size stamped bearings?

Stamped-bearing requirements can be customized according to drawings, samples, dimensions, materials, geometry, and production quantities.

Manufacturing feasibility depends on the proposed structure.

Can you manufacture a special size bearing according to my drawing?

Yes, engineering drawings can provide the basis for product evaluation.

Customers should identify all critical dimensions, tolerances, materials, mounting features, and application requirements.

Can you reproduce a special size bearing from a sample?

A physical sample can provide useful dimensional information when original drawings are unavailable.

Customers should also provide any known material, load, speed, and application requirements.

Can special size bearings replace discontinued bearings?

Potentially, yes.

If a standard replacement is unavailable, the original bearing, drawing, shaft dimensions, housing dimensions, and application can be evaluated to determine whether a suitable replacement can be developed.

Can you replace an obsolete special-size bearing?

Obsolete bearings may be candidates for custom replacement development.

Customers should provide as much information as possible about the original component and operating environment.

Manufacturing feasibility should be confirmed before production.

Can special size bearings be used in OEM products?

Yes. OEM products often require special dimensions because the bearing must fit a unique mechanical design.

OEM customers should provide technical drawings, assembly information, quantities, annual demand, and quality requirements.

Can I request a prototype before mass production?

Depending on the project, prototype development can be used to verify dimensions, fit, installation, movement, and assembly compatibility.

This is especially useful when the bearing size differs significantly from standard products.

What tolerance information should I provide?

Customers should identify critical tolerances on the drawing.

Typical critical dimensions may include bore diameter, outside diameter, width, flange dimensions, and mounting features.

The manufacturer can then evaluate whether the required tolerances are appropriate for the proposed product.

Can you produce special size bearings in small quantities?

Small-quantity requirements can be submitted for evaluation.

Feasibility depends on design, materials, tooling, production process, and order quantity.

Customers should provide both initial and expected future quantities.

Can special size bearings be mass produced?

After the design, prototype, and manufacturing process are approved, regular or larger-volume production can be evaluated according to the customer's requirements.

Annual demand and order forecasts can help with production planning.

What information should I provide for a special size bearing quotation?

Useful information includes:

Bearing type
2D drawing
3D CAD model
Physical sample
Inner diameter
Outer diameter
Width
Flange dimensions
Material
Required tolerances
Load
Speed
Application
Operating environment
Initial quantity
Estimated annual demand

Complete information makes technical evaluation more efficient.

What applications use special size bearings?

Special-size bearings can be used in industrial machinery, conveyors, automation equipment, packaging machinery, medical equipment, furniture, sliding systems, hardware, transportation products, fitness equipment, sporting goods, and specialized OEM applications.

The appropriate design depends on the actual operating conditions.

What is the difference between special size bearings and non-standard bearings?

The terms overlap.

Special size bearings specifically emphasize dimensions that differ from standard products.

Non-standard bearings are a broader category that can include special dimensions as well as unique structures, materials, geometry, or mounting configurations.

Why choose HSIAN JI for special size bearings?

HSIAN JI BEARING CO., LTD. has been involved in bearing development and manufacturing in Taiwan since 1995.

Our bearing categories include ball bearings, plastic bearings, thrust bearings, stamped bearings, slide bearings, special bearings, and non-standard bearings.

For customized projects, customers can provide drawings, physical samples, dimensions, materials, application information, and quantities for evaluation.

If you require special size bearings for an OEM product, replacement component, special machine, or non-standard mechanical application, send HSIAN JI your technical requirements to discuss a suitable manufacturing solution.

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