1 Model Information & Technical Parameters

Model：KDN.NAA17XL0M

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 M: Integrated passivation anti-corrosion specification for cage and rollers to improve moisture and rust resistance

Technical Attributes

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

Structure type: KDN.NAA improved light-duty straight window anti-corrosion caged needle roller assembly

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

Cage: Precision pressed steel NAA improved straight window cage with integral passivation anti-rust treatment

Needle roller: Standard precision grading with synchronized anti-corrosion surface finishing

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.013 kg

Indicative carbon footprint：0.038 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171506

Suffix Explanation

KDN.NAA: NAA improved light-duty straight window caged needle roller assembly without separate inner and outer rings; shaft and housing bore serve as raceway. Optimized pocket structure and full anti-corrosion treatment based on KAA design, compact radial dimension for light-load equipment under humid and slightly dusty conditions.

17: Suitable shaft diameter 17 mm.

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

M: Anti-corrosion reinforced specification. The whole assembly adopts passivation surface treatment, delivering better rust resistance during long-term storage compared with basic KAA models, suitable for mildly humid environments.

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 wear and pitting. 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. M treatment provides basic rust protection and cannot replace oil seals and end covers. Sealing structures are still required in high humidity and dusty environments. External lubrication is mandatory for open construction; dry running prohibited. Apply pressing force on cage end face instead of sidewall. Choose KDN.NAA17XL0KM for low-speed reciprocating wear resistance; select KDN.NAA17XL0A for low-noise demand in indoor environments; switch to CL0 clearance series for stable temperature and precision positioning; adopt JHA arched window series for medium load.

2 Structure & Operating Characteristics

Japan NMT KDN.NAA17XL0M compact improved straight window light-duty anti-corrosion caged needle roller assembly. The NAA improved straight window inherits the compact radial advantage of KAA, optimizes cage stress distribution and integrates full passivation anti-rust process. XL0 enlarged radial clearance adapts to alternating high-low temperature environments, absorbs assembly tolerances and prevents seizure caused by thermal expansion and contraction. Equipped with standard needle rollers, it targets light-load mechanisms with wide temperature range, mild humidity and dust, operating mainly in continuous and intermittent rotation without special optimization for low-speed micro-motion.

Selection reference:

KDN.NAA17XL0M (XL0 loose clearance + M anti-corrosion, wide temperature, mild humidity & dust, continuous intermittent rotation)

KDN.NAA17XL0KM (XL0 loose clearance + M anti-corrosion + K low friction, wide temperature & humidity, low-speed reciprocating swing)

KDN.NAA17XL0A (XL0 loose clearance + Grade A low noise, wide temperature & humidity, noise-sensitive continuous rotation equipment)

KDN.NAA17CL0/CL0M: CL0 precision clearance for stable temperature, positioning accuracy and mildly humid environments

KDN.KAA17XL0: Basic straight window without extra anti-rust coating for dry indoor conditions

KDN.JHA17XL0 series: Arched window cage with higher rigidity and load capacity for medium loads

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

3 Core Performance Advantages

1. Improved ultra-thin NAA straight stamped cage with small radial occupation and compact mechanical layout compatibility.

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

3. Full-set M-grade passivation anti-rust treatment enhances rust resistance during long-term storage, suitable for mildly humid and lightly dusty outdoor conditions.

4. Ringless integrated assembly simplifies mechanical 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 Continuous Intermittent Rotary Components with Obvious Temperature Variation & Mild Humidity

Hinge pivots of small outdoor automation equipment, rotary joints of open-air test tooling, rotary shafts of mobile light field equipment

4.2 Light-Duty Transmission Mechanisms with Limited Radial Space, Dry to Slightly Dusty Environment

Rotary units of small outdoor pan-tilt, light outdoor actuator modules, adjustable hinge parts of portable field instruments

4.3 Compact light-load modules prioritizing rust resistance and temperature adaptability without extreme positioning requirements

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly area clean and dry to reduce moisture and dust adhesion. Apply pressing force only on cage end face, avoid impacting cage sidewall. The light NAA cage has limited rigidity to prevent deformation under external force. Perform manual rotation test after assembly to exclude persistent jamming and abnormal resistance. Verify hardness, roughness and fitting tolerances of shaft and housing raceway before assembly.

5.2 Selection Guidance

Limited radial space, wide temperature range, mild humidity & dust, intermittent continuous rotation → KDN.NAA17XL0M

Compact layout, wide temperature & humidity, low-speed reciprocating swing, frequent start-stop → KDN.NAA17XL0KM

Compact layout, wide temperature & humidity, continuous rotation, low noise demand → KDN.NAA17XL0A

Stable operating temperature, mild humidity, high positioning accuracy required → KDN.NAA17CL0M series

Medium load requiring higher cage rigidity → KDN.JHA17XL0 series

Dry indoor environment, cost priority → KDN.KAA17XL0

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery. Select matched grease according to ambient temperature and humidity during assembly; circulating oil lubrication recommended for long continuous running. Conduct periodic re-lubrication maintenance; dry rotation forbidden. Water-resistant grease is recommended for humid conditions.

5.4 Environmental Application Notes

M passivation only provides basic anti-corrosion protection. End covers and oil seals must be installed for isolation under long-term rain, high moisture and heavy dust conditions. XL0 clearance causes larger radial runout, not applicable to high-precision positioning equipment. Light NAA structure cannot withstand overload and impact load.

6 Fault Identification

Common failure modes: Rust abrasion on needle rollers, rust pitting on shaft raceway, cage window deformation, steadily rising rotation resistance and abnormal clearance enlargement. Replace complete assembly once cage distortion or rust damage on rollers occurs; repair and reuse are prohibited.