The NKX25Z combines a needle roller bearing and a thrust ball bearing into a single unit designed for compact mechanisms requiring simultaneous radial load support and unidirectional axial load support. Featuring a 25 mm bore, 37 mm outside diameter, and 30 mm overall width, it delivers high load capacity within a minimal installation envelope. The needle roller assembly manages radial forces, while the integrated thrust ball assembly handles axial forces in one direction. Built with a pressed-steel shield on one side, this configuration suits gear mechanisms, fluid pumps, industrial compressors, and high-precision rotating assemblies where combined loads occur.

Combined Load Support
Integrates radial needle roller and thrust ball sections to handle radial loads and single-direction axial loads within a single mounting position.
Compact Installation Envelope
The 25 mm by 37 mm by 30 mm dimensions combine two distinct bearing functions, eliminating the need for separate radial and axial housing locations.
Shielded Design Configuration
Incorporates a pressed-steel shield on one side to restrict the ingress of external particulate contaminants during operation.
Precision Steel Construction
Manufactured from high-grade bearing steel with precision-controlled grinding and finishing on functional surfaces to ensure dimensional stability.

NKX25Z is worth considering when the mechanical layout has three characteristics:

1. A rotating shaft

The bearing is intended for rolling support around a shaft.

2. Radial and axial forces occur in the same area

This is where its combined construction becomes useful.

3. The designer wants to avoid unnecessary bearing components

A combined unit can reduce the number of separate parts in the assembly.

Typical equipment may include compact:

transmissions

gear mechanisms

automation modules

indexing equipment

drive assemblies

mechanical actuators

The actual selection must be based on the machine's operating conditions.

A catalogue model does not tell the complete story.

The same NKX25Z may be installed in two machines with completely different working conditions.

One could operate continuously at moderate speed.

Another could run intermittently with frequent acceleration, reversing movement and changing axial force.

These differences matter.

For technical approval, average load alone is not enough. Peak operating conditions should also be considered.

NKX25Z is not intended to replace every radial and thrust bearing combination.

A different arrangement may be preferable when:

radial and axial loads occur at widely separated positions

axial loads are exceptionally high

the machine requires adjustable axial positioning

the shaft arrangement requires independent bearing locations

operating conditions exceed the bearing's specification

The purpose of a combined bearing is to simplify a suitable design, not to force every application into one bearing format.

High-Grade Bearing Steel
Primary load-bearing components utilize premium alloy steel formulated to deliver high surface hardness and prolonged rolling-contact fatigue life.
Controlled Heat Treatment
Thermal processing parameters are tightly regulated to achieve uniform microstructural hardness across all raceways and rolling elements.
Precision Surface Grinding
Advanced grinding procedures regulate bore tolerances, outer diameters, overall widths, and functional raceway finish quality.

Assembly and Inspection
Needle rollers, cages, thrust balls, and shielding components undergo automated and manual assembly followed by rigorous rotational testing.

Dimensional Verification
Critical measurements, including the 25 mm bore, 37 mm outside diameter, and 30 mm width, are verified against strict production tolerances.
Hardness & Surface Checks
All heat-treated components undergo metallurgical hardness testing and surface finish evaluations to meet engineering standards.
Rotational Testing
Finished assemblies are tested prior to final packaging to verify smooth rotational movement, acoustic performance, and structural integrity.
Batch Traceability Systems
Production documentation and inspection logs are maintained by production batch to support quality verification and reordering.

Shaft & Housing Preparation
Mating shaft and housing surfaces require adequate hardness, smooth surface finishes, and precise dimensional accuracy to support expected loads.
Fillet Radius Clearance
Mating shoulders must accommodate the 0.6 mm minimum fillet radius specified for the bearing to prevent structural interference during mounting.
Directional Axial Setup
The integrated thrust mechanism is engineered for axial loading in a single direction; opposing arrangements are required for bidirectional loads.
Lubrication Management
Lubricant selection must align directly with operational speeds, expected temperatures, applied loads, and environmental contamination levels.

Gear Mechanisms
Applied in multi-stage gearboxes where radial gear forces require stabilization alongside controlled axial positioning within restricted spaces.
Pumps & Compressors
Utilized in compact fluid handling equipment requiring simultaneous radial support and unidirectional axial location under continuous operation.
Transmission Systems
Simplifies complex mechanical arrangements by consolidating separate bearing positions into a single compact unit along drive shafts.
Industrial Machinery
Integrated into specialized machinery where reduced installation footprints and combined load capacities are primary engineering criteria.

Original Equipment Manufacturing
Custom production runs can be arranged according to approved technical drawings, specific performance parameters, and unique configurations.
Tailored Packaging Options
Protective packaging can be customized with neutral labeling, private branding, or specialized container formats per project requirements.
Sample Evaluation Program
Sample units are available for functional testing, dimensional verification, and prototyping prior to volume production commitments.
Production Scheduling
Volume quotations and manufacturing schedules are tailored to specific order quantities, packaging standards, and delivery target dates.

Quality Management Standards
Manufacturing operations align with recognized quality assurance frameworks, including ISO 9001 and IATF 16949 operational guidelines.
Material & Regulatory Compliance
Product documentation includes material safety data sheets, RoHS compliance reports, and SGS verification records where requested.
Shipment Documentation
Standard documentation packages include detailed inspection certificates, formal certificates of conformity, and comprehensive packing lists.

Individual Surface Protection
Each bearing is treated with protective coatings and wrapped individually to prevent moisture ingress, dust accumulation, and contact damage.
Bulk Volume Packaging
Large quantity orders utilize heavy-duty inner boxes and reinforced corrugated outer cartons designed for secure transit.
Global Export Shipping
Logistics packaging is engineered for international sea freight, air cargo, and express courier transport, featuring clear external labeling.

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