1 Model Information & Technical Parameters

Model：KDN.KAA17XL0K

Dimensions

Matching shaft diameter d：17 mm

Performance Data

Minimum required shaft hardness ≥HRC60

Shaft raceway roughness Ra ≤0.2 μm

XL0: Loose radial clearance group

Suffix K: Low-friction specification with crowned roller ends, reducing low-speed breakaway torque and improving wear resistance under reciprocating oscillation

Technical Attributes

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

Structure type: KDN.KAA light-duty straight window general-purpose caged needle roller assembly

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

Cage: Precision pressed steel KAA straight window light-duty standard cage

Needle roller: End crowning treatment to optimize contact status during low-speed reciprocating motion

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.013 kg

Indicative carbon footprint：0.036 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171506

Suffix Explanation

KDN.KAA: KAA series light-duty straight window caged needle roller assembly without separate inner and outer rings; shaft and housing bore serve as raceway. Thin straight window design saves radial space with limited load capacity for light-load compact structures.

17: Suitable shaft diameter 17 mm.

XL0: Loose radial clearance grade with sufficient clearance margin to compensate thermal expansion and assembly tolerance under wide temperature variation.

K: Low-friction optimized specification with crowned roller ends, lowering startup torque under low-speed oscillation and frequent start-stop, mitigating edge stress wear.

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 lead to early pitting and raceway scoring. Only light pure radial load permitted; axial load and impact load forbidden. XL0 loose clearance brings larger radial runout, not suitable for high-precision positioning applications. Open construction requires external lubrication and dust protection; dry running prohibited. Apply pressing force on cage end face, avoid striking cage sidewall. Select KDN.KAA17XL0A for low-noise demand; choose CL0 clearance series for precision positioning; switch to JHA arched window models for medium load.

2 Structure & Operating Characteristics

Japan NMT KDN.KAA17XL0K compact straight window light-duty caged needle roller assembly. Ultra-thin KAA straight window cage minimizes radial installation space. XL0 enlarged radial clearance adapts to alternating high-low temperature environments, absorbing assembly tolerance and preventing seizure caused by thermal contraction or expansion. Equipped with K low-friction roller crowning technology, specially optimized for low-speed oscillation and frequent start-stop, relieving stress concentration and wear under reciprocating movement. Ideal for light automation mechanisms with limited installation space, temperature fluctuation and mainly reciprocating swing or intermittent rotation.

Selection reference:

KDN.KAA17XL0K (XL0 loose clearance + K low-friction upgrade, wide temperature range, low-speed reciprocating swing, frequent start-stop)

KDN.KAA17XL0A (XL0 loose clearance + Grade A low-noise upgrade, wide temperature range, continuous rotation, noise-sensitive equipment)

KDN.KAA17XL0 (XL0 loose clearance standard model, continuous rotation in wide temperature range, no reciprocating micro-motion enhancement)

KDN.KAA17CL0/CL0A/CL0K: CL0 precision clearance for precision positioning and stable temperature conditions

KDN.JHA17XL0 series: JHA arched window cage with higher rigidity and load capacity for medium load

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

3 Core Performance Advantages

1. Ultra-thin KAA straight stamped cage with compact radial dimension, supporting mechanical layout in confined space.

2. XL0 loose radial clearance adapts to alternating high-low temperature, compensating thermal deformation and assembly tolerance to prevent seizure.

3. K roller end crowning technology reduces low-speed breakaway torque and improves wear resistance under reciprocating swing.

4. Ringless integrated assembly simplifies component design and supports lightweight equipment development.

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

4 Typical Application Fields

4.1 Light-Duty Reciprocating Swing Mechanisms with Temperature Variation

Hinge pivots of outdoor automation equipment, oscillating joints for high-low temperature test tooling, rotary shafts of mobile light actuator modules

4.2 Confined-Space Intermittent Rotary Components with Frequent Start-Stop

Pivots for small flipping tooling, auxiliary joints of lightweight robots, adjustable rotary units of portable devices

4.3 Compact transmission structures without extreme positioning accuracy, prioritizing anti-seizure under temperature change

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain clean assembly environment; foreign particles inside raceway accelerate wear during reciprocating motion. Apply pressing force only on cage end face, never impact cage sidewall. Light KAA cage has limited rigidity to prevent deformation. Perform manual reciprocating swing test after assembly, confirm no persistent jamming or abnormal resistance jump. Verify hardness, roughness and fitting tolerances of shaft and housing raceway before assembly.

5.2 Selection Guidance

Limited radial space, wide temperature range, low-speed reciprocating swing, frequent start-stop → KDN.KAA17XL0K

Compact layout, wide temperature range, continuous rotation, low noise requirement → KDN.KAA17XL0A

Compact layout, wide temperature continuous rotation, no reciprocating micro-motion → KDN.KAA17XL0

Stable working temperature, high positioning accuracy required → KDN.KAA17CL0 series

Medium load requiring higher cage rigidity → KDN.JHA17XL0 series

Integrated outer ring needed for direct base mounting → NK / RNA needle roller bearings

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery. Select suitable grease according to operating temperature during assembly; circulating oil lubrication recommended for long continuous running. Implement periodic re-lubrication; dry rotation forbidden. Anti-fretting grease is recommended for low-speed reciprocating working conditions.

5.4 Environmental Application Notes

No permanent anti-rust coating. Coat with anti-rust oil and seal tightly for long-term storage. Install end covers and oil seals under dusty and humid conditions. XL0 clearance causes larger radial runout, not applicable to high-precision positioning equipment. Light KAA structure cannot withstand overload and impact load.

6 Fault Identification

Common failure modes: Roller edge abrasion, fretting corrosion on shaft raceway, cage window deformation, steadily rising swing resistance and abnormal clearance enlargement. Replace complete assembly once cage distortion or roller damage occurs; repair and reuse are prohibited.