1 Model Information & Technical Parameters

Model：KDN.JHA10CL0K

Dimensions

Matching shaft diameter d：10 mm

Performance Data

Minimum required shaft hardness ≥HRC60

Shaft raceway roughness Ra ≤0.2 μm

CL0: Precision radial clearance group

Suffix K: Low-friction optimized specification, roller end crowning & precision polishing of cage contact surface

Technical Attributes

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

Structure type: KDN.JHA medium arched window 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 K friction-optimized finishing

Needle roller: End crowning treatment to reduce edge stress and sliding friction

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.007 kg

Indicative carbon footprint：0.03 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 act as raceway. Arched window provides higher rigidity than KAA straight window cage.

10: Suitable shaft diameter 10 mm.

CL0: Precision radial clearance grade with controllable clearance range for precision transmission.

K: Low-friction & low breakaway torque specification. Roller end crowning and optimized sliding contact between rollers and cage reduce startup resistance, ideal for frequent start-stop and low-speed micro-motion applications.

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 is forbidden. Open construction relies on external lubrication and housing dust protection; dry running is prohibited. Do not strike cage during assembly; pressing force shall act on cage end face. K low-friction design improves tribological performance but cannot replace adequate lubrication.

2 Structure & Operating Characteristics

Japan NMT KDN.JHA10CL0K compact arched window caged needle roller assembly. JHA arched window cage delivers higher rigidity and better deformation resistance than KAA straight window structure. CL0 precision clearance balances assembly tolerance and rotary accuracy. Equipped with K-class low-friction configuration: roller end crowning eliminates edge stress concentration; precision finishing on cage contact area reduces micro-slip and sliding friction, greatly lowering breakaway torque, suitable for frequent start-stop, low-speed small swing and micro-feed applications. Pressed arched cage separates rollers evenly to avoid mutual friction, applicable for medium-low speed precision continuous rotation and intermittent micro-motion.

Selection reference:

KDN.JHA10CL0 (standard CL0 precision clearance base model, general precision transmission)

KDN.JHA10CL0K (CL0 precision clearance + K low-friction optimization, frequent start-stop, low-speed micro-motion, low startup torque required)

KDN.KAA series: Light-duty straight window cage for extreme radial space limitation

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

3 Core Performance Advantages

1. JHA arched window cage structure with enhanced rigidity and deformation resistance, suitable for mild load fluctuation conditions.

2. CL0 precision clearance ensures stable rotary accuracy to meet positioning demands of precision transmission.

3. K low-friction optimization: roller crowning & contact surface finishing reduce breakaway torque and sliding friction loss.

4. Alleviates edge stress on rollers, restrains local pitting and extends service life under low-speed micro-motion.

5. Ringless integrated assembly facilitates lightweight and compact equipment integration.

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

4 Typical Application Fields

4.1 Precision Automation Equipment with Frequent Start-Stop

Feed pivots of servo modules, rotary hinges of miniature slides, micro-motion spindles for automation tooling

4.2 Small Precision Transmission Components

Supports for miniature servo gearboxes, small intermittent indexing mechanisms, low-resistance continuous rotary parts

4.3 Optical & Inspection Instruments

Fine-tuning spindles for vision equipment, micro-swing pivots of measuring instruments, rotary supports for optical focusing

4.4 Precision Parts for Intelligent Actuators

Rotary shafts of small electric pan-tilts, swing supports of precision valves, miniature medical transmission assemblies

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain dust-free clean assembly area; contaminants will increase friction torque. Apply pressing force to cage end face; avoid striking cage sidewall. Manually rotate after assembly to verify smooth motion with uniform startup resistance and no jamming. Check hardness and roughness of shaft and housing raceway before assembly.

5.2 Selection Guidance

Medium-small precision transmission without special low-torque requirement → KDN.JHA10CL0

Frequent start-stop, low-speed micro-motion requiring low startup resistance → KDN.JHA10CL0K

Extremely limited radial installation space & light load → KDN.KAA series

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery; apply grease matched for low-friction performance during assembly. Circulating oil lubrication recommended for long continuous operation. Schedule regular re-lubrication; insufficient lubrication will raise torque and accelerate wear.

5.4 Environmental Application Notes

No permanent anti-rust coating. Coat anti-rust oil and seal tightly for long-term storage. Install end covers and oil seals under dusty and humid conditions. Not recommended for heavy impact scenarios; impacts deform the cage and destroy optimized low-friction fit.

6 Fault Identification

Common failure modes: Roller edge pitting, shaft raceway scoring, cage window deformation, abnormal rise of startup torque, seizure due to insufficient lubrication. Replace complete assembly if cage distortion or roller damage occurs; repair and reuse are forbidden.