Constant Cross Section Ball Bearing for Different Bore Sizes

Komel Bearing Co., Ltd. supplies constant cross section ball bearing for different bore sizes, engineered to deliver stable structural performance and consistent rotational accuracy for customers working on space-restricted mechanical designs. This bearing variant adopts a square-section layout, where the cross-section geometry stays unchanged regardless of bore dimension adjustments, which simplifies component standardization and inventory management for engineering teams. The raceway profile supports four-point contact between steel balls and ring grooves, enabling combined load capacity for radial force, bidirectional axial force and overturning moment. It occupies minimal axial installation space compared to paired angular contact ball bearings, making it suitable for lightweight, high-precision rotary structures. Production follows controlled grinding and inspection workflows, and finished units are tested to verify friction stability and dimensional consistency before shipment. The product lineup covers KAA, KA, KB, KC, KD, KF, KG series with inch-based bore specifications, offering multiple bore selections for equipment redesign and new project development.

Product Features

Fixed Cross Section Design

1. The cross-section profile remains constant within the same series while bore and outer diameter dimensions vary, so engineers can reuse mounting housings and spacer designs across different bore sizes.

2. The wall thickness between inner and outer rings is narrow, supporting lightweight construction and reducing overall payload for moving rotary parts.

3. Four-point contact raceway geometry allows single bearing units to replace two back-to-back angular contact ball bearings, shortening assembly width.

Load Performance

1. It accepts combined radial load, two-way axial load and overturning moment simultaneously, removing the need for extra thrust bearing sets in many rotary mechanisms.

2. Low friction torque keeps running heat low under continuous rotation, which helps preserve precision for long-duration operation.

3. Uniform internal clearance control ensures smooth rotation without stick-slip movement at low speeds.

Technical Specification

All dimensional data below follows inch measurement standards, covering bore, outer diameter, land diameters and unit weight for each serial number.

Additional series including KA, KB, KC, KD, KF, KG provide extended bore ranges from 2.000 inches up to 40.000 inches, with corresponding weight values listed for each part number.

Application Scope

1. Industrial robot joint assemblies, where uniform section size helps standardize joint modules across different robot payload classes.

2. Medical imaging rotating frames, requiring steady rotation and low vibration during scanning cycles.

3. Optical positioning stages and focusing mechanisms for measurement instruments.

4. Aerospace onboard payload rotary structures, where weight reduction is a critical design target.

5. High precision machine tool spindle auxiliary rotary units.

Quality Control

1. Raw ring material undergoes hardness and metallurgy inspection before machining.

2. Raceway grinding and superfinishing are completed on precision grinding equipment to maintain surface finish requirements.

3. Each finished bearing undergoes rotational torque and dimensional inspection before packaging.

4. Batch records are retained for traceability, supporting quality review for export orders.

Packaging & Shipment

1. Individual bearings are protected with anti-rust oil and sealed in moisture-proof packaging for ocean and air freight.

2. Outer cartons are reinforced for long-distance transit to avoid deformation of precision rings.

3. Shipment documents include packing list and dimensional datasheet for receiving inspection.

FAQ

Q: Can I select different bore sizes while keeping the same mounting envelope?

A: Yes. This constant cross section ball bearing for different bore sizes is designed so the cross-section dimension stays consistent inside one series. You can swap different bore part numbers without modifying the surrounding housing and spacer structure, which reduces redesign work when adjusting shaft diameters.

Q: What load types can this bearing support?

A: It handles radial loads, bidirectional axial loads and overturning moments. It functions equivalently to two back-to-back angular contact ball bearings, but with a narrower overall width.

Q: Is lubrication included with the delivered bearing?

A: Standard supply does not include pre-filled grease. Customers can select grease type and viscosity according to rotation speed, temperature and clean environment requirements for their assembly.

Q: What is the unit of the specification table?

A: All dimensions in the table are in inches, and weight values are in pounds. Metric conversion can be provided on request for internal engineering drawing use.

Q: Can samples be arranged for verification before bulk purchase?

A: Sample supply is available. Sample lead time and freight cost will be quoted separately based on selected part numbers.

Q: What is the main limitation for this bearing design?

A: Owing to thin section structure, shock load must be controlled. It is not suitable for heavy impact operating conditions, and users should calculate overturning moment carefully at the design stage.