Selecting suitable bearings requires careful consideration of radial and axial loads, installation dimensions, lubrication conditions, and operating requirements. IKO needle bearings include designs that combine needle roller elements with thrust bearing components to accommodate different loading conditions within a compact assembly. The NAXK30Z is a needle roller-ball thrust bearing designed for metric applications, with specified dimensions and load ratings that help equipment designers assess its suitability for mechanical systems.

Understanding the NAXK30Z Bearing Structure

The NAXK30Z features a needle roller-ball thrust bearing construction. This arrangement combines a needle roller bearing section with a ball thrust bearing section, supporting radial and axial load requirements within one bearing assembly.

The product is listed in the series without an inner ring and is designed for use with the JR25x30x20 inner ring. This configuration is an important consideration during equipment design because the mating components and shaft arrangement need to match the intended bearing installation.

The bearing uses bearing steel as its material and has a shielded design. These characteristics form part of its construction specification and should be considered alongside the operating environment, lubrication method, and maintenance requirements of the application.

Dimensional Specifications and Installation Compatibility

Accurate dimensional matching is essential when selecting a replacement bearing or designing a new mechanical assembly. The NAXK30Z uses metric measurements, with a bore diameter of 30 mm and an outer diameter of 42 mm. Its overall width is 30 mm.

The associated thrust bearing has an outer diameter of 48 mm and a thickness of 11 mm. The specified minimum radius, r(min.), is 0.6 mm, while the C2 dimension is listed as 9.5 mm.

These measurements provide a starting point for checking installation compatibility. Buyers and engineers should compare the dimensions against the equipment drawing and confirm the relevant mounting clearances before ordering.

The product's lack of an integrated inner ring also deserves attention. Since the NAXK30Z is specified for use with the JR25x30x20 inner ring, the mating component should be verified as part of the complete bearing arrangement rather than treating the bearing as an isolated replacement part.

Radial and Axial Load Ratings

Load capacity is a major consideration when evaluating bearing performance in machinery. The NAXK30Z has specified dynamic and static load ratings for both radial and axial loading, allowing engineers to compare these values with the requirements of their equipment.

The listed dynamic radial load rating is 20.2 kN, while the static radial load rating is 34.6 kN. For axial loading, the dynamic rating is 19.5 kN and the static rating is 39.9 kN.

The fatigue load limits are 5.35 kN for radial loading and 2.15 kN for thrust loading. These values provide additional information for engineering assessment, but they should not be interpreted as direct substitutes for the dynamic or static load ratings.

Actual bearing selection depends on the magnitude and direction of the applied loads, rotational speed, lubrication, installation accuracy, and required service life. Engineers should evaluate the complete operating conditions before confirming that this model meets a particular application requirement.

Operating Speed and Lubrication Considerations

Operating speed and lubrication conditions influence bearing selection and service performance. For the NAXK30Z, the listed maximum speed under oil lubrication is 5.6 × 1,000 rpm, equivalent to 5,600 rpm.

This value applies to the specified oil-lubricated condition. It should not automatically be treated as the maximum permissible speed under other lubrication arrangements or operating conditions.

When incorporating the bearing into machinery, engineers should assess the lubrication system, heat generation, applied loads, and expected operating cycle. Following appropriate installation and maintenance practices can also help reduce avoidable wear and support dependable operation.

The listed shielded construction is another specification to review when considering the surrounding environment. Buyers should confirm the product's suitability for the actual contamination exposure and operating conditions rather than assuming a particular level of environmental protection.

Key Information for Bearing Buyers

When sourcing the NAXK30Z, procurement teams and technical personnel can use the following checklist to verify product compatibility:

Model identification: Confirm the required NAXK30Z designation and the corresponding product documentation.

Mounting arrangement: Check the specified JR25x30x20 inner ring and related installation dimensions.

Load requirements: Compare radial and axial load ratings with the actual operating conditions.

Speed and lubrication: Verify the required rotational speed and whether oil lubrication is appropriate.

Material and construction: Review the bearing steel material, shielded design, and inner-ring configuration.

Compliance: Confirm the RoHS compliance status for applicable purchasing and market requirements.

Checking these details before procurement helps reduce the risk of dimensional mismatches and unsuitable operating conditions.

Frequently Asked Questions

Q1: What type of bearing is the NAXK30Z?

It is a needle roller-ball thrust bearing with a shielded construction and no integrated inner ring.

Q2: Which inner ring is specified for the NAXK30Z?

The listed compatible inner ring is JR25x30x20. Buyers should confirm the complete mounting arrangement before installation.

Q3: What is the maximum listed speed under oil lubrication?

The specified maximum speed is 5,600 rpm under oil lubrication.

Q4: Is the NAXK30Z RoHS compliant?

Yes. Its listed RoHS status is compliant.

Matching Bearing Specifications to Equipment Needs

The NAXK30Z combines needle roller and ball thrust bearing elements in a metric assembly with defined dimensional and load specifications. Its 30 mm bore, 42 mm outer diameter, and stated radial and axial load ratings provide essential reference points for technical evaluation.

For equipment manufacturers, maintenance teams, and industrial bearing distributors, verifying the model designation, mating components, load conditions, and lubrication requirements is an important step in the sourcing process.

Contact us to discuss the NAXK30Z, review its specifications, and confirm whether the bearing configuration matches your equipment requirements.