1 Model Information & Technical Parameters

Model：KDN.KAA17CL0

Dimensions

Matching shaft diameter d：17 mm

Performance Data

Minimum required shaft hardness ≥HRC60

Shaft raceway roughness Ra ≤0.2 μm

CL0: Precision radial clearance group

No suffix: Light-duty precision standard specification, without low-noise optimization or roller crowning low-friction treatment

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: Standard precision grading for light-load precision working conditions

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.013 kg

Indicative carbon footprint：0.034 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. The thin straight window design saves radial space, with lower load capacity compared to JHA arched window cage for medium load.

17: Suitable shaft diameter 17 mm.

CL0: Precision radial clearance grade with strictly controlled clearance range, low radial runout, suitable for precision mechanisms requiring rotary positioning accuracy.

No suffix: Light-duty precision standard edition without A noise control or K roller crowning low-friction process, cost-effective for compact light-load precision continuous rotation 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 light pure radial load permitted; axial load and impact load forbidden. CL0 precision clearance is sensitive to machining and assembly tolerances of shaft and housing. 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. Select KDN.KAA17CL0K for frequent start-stop and low-speed swing; choose KDN.KAA17CL0A for indoor low-noise precision equipment; switch to KDN.JHA17 series for medium load conditions.

2 Structure & Operating Characteristics

Japan NMT KDN.KAA17CL0 compact straight window light-duty caged needle roller assembly. The thin KAA straight stamped cage minimizes required radial installation space. CL0 precision clearance strictly controls radial gap to guarantee rotary positioning accuracy. As the light base version of CL0 clearance, it adopts standard roller grading and straight window pocket machining, focusing on lightweight precision matching for limited installation space. Suitable for general precision automation mechanisms mainly running continuous rotation, light load, without low-speed micro-motion or strict noise restrictions.

Selection reference:

KDN.KAA17CL0 (CL0 precision clearance light standard, limited radial space, light precision continuous rotation)

KDN.KAA17CL0A (CL0 precision clearance + A low-noise upgrade, compact noise-sensitive indoor precision equipment)

KDN.KAA17CL0K (CL0 precision clearance + K low-friction upgrade, compact mechanism frequent start-stop & low-speed swing)

KDN.JHA17CL0 / CL0A / CL0K: JHA arched window design, higher rigidity & load capacity for medium loads

KDN.KAA17XL0 / XL0A / XL0K: XL0 loose clearance, priority for wide temperature range and thermal expansion compensation

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

3 Core Performance Advantages

1. Ultra-thin KAA straight stamped cage, occupies less radial space for ultra-compact precision mechanical layout.

2. CL0 precision radial clearance with accurately controlled radial gap, excellent rotary positioning accuracy.

3. Light-duty universal manufacturing process with prominent cost performance for mass small precision automation equipment.

4. Ringless integrated assembly simplifies mechanical layout and supports lightweight equipment design.

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

4 Typical Application Fields

4.1 Light-Load Precision Continuous Rotation Components with Limited Radial Space

Rotary spindles for small precision inspection equipment, hinge joints of portable intelligent precision devices, pivot points for miniature automated precision transport modules

4.2 Normal-Temperature Light-Load Precision Transmission Mechanisms without Reciprocating Motion

Precision tooling pivots, light precision actuators, continuous rotation units for miniature precision pan-tilt

4.3 Compact modules requiring basic rotary accuracy and limited radial mounting dimension

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly area clean; contaminants accelerate raceway wear and impair rotary accuracy. Apply pressing force only on cage end face, avoid hitting cage sidewall; the light KAA cage has limited rigidity, prevent heavy impact. Manually rotate after assembly to confirm no persistent jamming. Verify hardness, roughness and fitting tolerances of shaft and housing raceway before assembly.

5.2 Selection Guidance

Limited radial installation space, light load, precision continuous rotation, few micro-motions, no special noise demand → KDN.KAA17CL0

Compact layout + noise-sensitive indoor precision equipment → KDN.KAA17CL0A

Compact layout + frequent start-stop & low-speed swing → KDN.KAA17CL0K

Medium load requiring higher cage rigidity → KDN.JHA17 series

Wide temperature range needing thermal expansion compensation → XL0 clearance 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 matched grease according to ambient temperature during assembly; circulating oil lubrication recommended for long continuous operation. Carry out periodic re-lubrication maintenance; dry rotation forbidden.

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 is not suitable for equipment with large temperature difference and severe thermal expansion. KAA light cage cannot withstand impact load and overload.

6 Fault Identification

Common failure modes: Needle roller surface pitting, shaft raceway scoring, cage window deformation, steadily rising rotation resistance and gradual loss of rotary accuracy. Replace complete assembly once cage distortion or roller damage occurs; repair and reuse are not allowed.