1 Model Information & Technical Parameters

Model：KDN.JHA15CL0A

Dimensions

Matching shaft diameter d：15 mm

Performance Data

Minimum required shaft hardness ≥HRC60

Shaft raceway roughness Ra ≤0.2 μm

CL0: Precision radial clearance group

Suffix A: Grade A low-noise smooth running specification; ultra-precise roller grading, tightly controlled cage pocket clearance to reduce rolling impact noise

Technical Attributes

Supply form: Needle rollers + cage assembly (without inner ring & outer ring)

Structure type: KDN.JHA medium arched window general-purpose caged needle roller assembly

Axial characteristic: Pure radial load only, axial force and continuous impact load prohibited

Cage: Precision pressed steel JHA arched window cage with Grade A noise-control dimensional tolerance

Needle roller: High-precision graded selection with strictly controlled dimension deviation to reduce vibration and abnormal noise

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.012 kg

Indicative carbon footprint：0.04 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171506

Suffix Explanation

KDN.JHA: JHA series medium arched window caged needle roller assembly without separate inner and outer rings; shaft and housing bore serve as raceway. Arched window provides higher rigidity than KAA straight window cage, suitable for medium-load precision transmission.

15: Suitable shaft diameter 15 mm.

CL0: Precision radial clearance grade with strictly controlled clearance range, tighter radial runout control, suitable for precision positioning and low-vibration applications.

A: Grade A low-noise optimized specification, focusing on suppressing roller impact noise at medium-low speed, suitable for precision inspection, servo mechanisms and indoor low-noise automation equipment.

Important reminder: This model has no solid inner and outer rings. Mating shaft and housing bore must be hardened and precision ground. Insufficient hardness and surface finish will cause early pitting, raceway scoring or seizure. Only pure radial load permitted; axial load forbidden. CL0 precision clearance requires higher shaft and housing machining accuracy; assembly tolerances must be controlled. Open construction relies on external lubrication and housing dust protection; dry running prohibited. Do not strike cage during assembly; pressing force shall act on cage end face. For frequent start-stop and low-speed micro-motion, evaluate KDN.JHA15CL0K.

2 Structure & Operating Characteristics

Japan NMT KDN.JHA15CL0A compact arched window caged needle roller assembly. JHA arched window cage offers excellent rigidity and is more suitable for medium loads and mild load fluctuation than light-duty straight window structures. CL0 precision clearance strictly controls radial clearance and improves rotary accuracy and positioning stability. Grade A low-noise configuration reduces roller motion impact and suppresses medium-low speed vibration and noise through high-precision roller grading and precision cage pocket machining. Suitable for precision automation mechanisms requiring simultaneous rotary accuracy, stability and low noise.

Selection reference:

KDN.JHA15CL0A (CL0 precision clearance + Grade A low-noise upgrade, precision positioning, low vibration, low noise)

KDN.JHA15CL0K (CL0 precision clearance + K low-friction upgrade, frequent start-stop, low-speed micro-motion, low breakaway torque)

KDN.JHA15CL0 (CL0 precision clearance standard model, no special noise/friction enhancement)

KDN.JHA15XL0 / XL0A / XL0K: XL0 loose clearance, thermal expansion compensation priority

KDN.KAA15 series: Light-duty straight window cage for limited radial space and light load

NK/RNA series: needle roller bearings with integrated outer ring.

3 Core Performance Advantages

1. JHA arched stamped cage with high rigidity, better stability under medium load and mild load fluctuation.

2. CL0 precision radial clearance with tight radial clearance control, improving rotary accuracy and positioning stability.

3. Grade A low-noise manufacturing standard, precise roller sorting and controlled cage pocket size reduce medium-low speed impact noise.

4. Smooth rolling motion and lower vibration, suitable for precision inspection, servo transmission and indoor automation lines.

5. Ringless integrated assembly supports lightweight and compact mechanical design.

6. Open design compatible with long-service grease lubrication and circulating oil lubrication.

4 Typical Application Fields

4.1 Precision Inspection and Measuring Equipment

Rotary supports for visual inspection equipment, precision spindles for measuring instruments, rotary pivots for laboratory automation tooling

4.2 Small Servo and Precision Transmission Mechanisms

Supports for miniature servo modules, precision gear transmission components, hinge parts of indexing mechanisms

4.3 Low-Noise Industrial Automation Equipment

Indoor automation actuator joints, low-noise transport modules, precision tooling rotary units

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain dust-free clean assembly area; contaminants increase vibration and noise. Apply pressing force only on cage end face, avoid hitting cage sidewall. Manually rotate after assembly to confirm smooth motion without obvious periodic abnormal noise. Verify hardness, roughness and fitting tolerances of shaft and housing raceway before assembly.

5.2 Selection Guidance

Precision positioning, low vibration, low noise, medium-load continuous rotation → KDN.JHA15CL0A

Frequent start-stop, low-speed micro-motion requiring reduced startup resistance → KDN.JHA15CL0K

Precision positioning without special noise/low-friction requirements → KDN.JHA15CL0

Thermal expansion compensation and assembly tolerance absorption prioritized → KDN.JHA15XL0 series

Extremely limited radial installation space and light load → KDN.KAA15 series

Integrated outer ring required for direct housing mounting → NK / RNA needle roller bearings

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery. Select suitable grease during assembly; circulating oil lubrication recommended for long continuous operation. Carry out periodic re-lubrication maintenance; dry rotation forbidden. Low-noise special grease is recommended for better acoustic performance.

5.4 Environmental Application Notes

No permanent anti-rust coating. Apply anti-rust oil and seal tightly for long-term storage. Install end covers and oil seals under dusty and humid conditions. CL0 precision clearance requires higher shaft and housing machining accuracy; excessive assembly tolerance will affect accuracy and noise performance.

6 Fault Identification

Common failure modes: Needle roller surface pitting, shaft raceway scoring, cage window deformation, steadily rising operating noise and aggravated periodic vibration. Replace complete assembly once cage distortion or roller damage occurs; repair and reuse are not allowed.