1 Model Information & Technical Parameters

Model：KDN.KAA10XL0Q

Dimensions

Matching shaft diameter d：10 mm

Performance Data

Minimum required shaft hardness ≥HRC60

Shaft raceway roughness Ra ≤0.2 μm

XL0: Precision radial clearance group

Suffix Q: Low-noise optimized specification, ultra-precise roller sorting & tight tolerance control of cage windows

Technical Attributes

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

Structure type: KDN.KAA miniature standard window caged needle roller assembly

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

Cage: Precision pressed steel KAA lightweight cage with Q-grade optimized machining

Needle roller: Ultra-precision graded rollers with strictly controlled dimensional dispersion

Seal: Open design, no built-in seal

Pre-grease: None

Logistics & Industry Codes

Net weight：0.006 kg

Indicative carbon footprint：0.03 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171506

Suffix Explanation

KDN.KAA: KAA series miniature standard window caged needle roller assembly without separate inner and outer rings; shaft and housing bore serve as raceway.

10: Suitable shaft diameter 10 mm.

XL0: Precision radial clearance grade, higher accuracy than standard AR series.

Q: Low-noise optimized specification. Strict control over roller dimensional tolerance and cage window fitting clearance to reduce running noise and vibration, ideal for continuous rotary applications sensitive to noise.

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 trigger 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. Q precision optimization reduces noise but cannot replace proper lubrication.

2 Structure & Operating Characteristics

Japan NMT KDN.KAA10XL0Q miniature compact caged needle roller assembly is a low-noise upgraded variant based on KDN.KAA10XL0. KAA lightweight standard window cage adapts to limited radial installation space. XL0 precision clearance balances assembly tolerance and rotary accuracy. It follows Q-class noise control standard: needle rollers are sorted with higher precision, cage window fitting clearance is optimized to mitigate roller slip impact and suppress operating noise and vibration. Pressed steel cage separates rollers to avoid mutual friction, suitable for medium-low speed continuous rotation and precision transmission requiring low noise.

Selection reference:

KDN.KAA10AR0 (AR0 standard clearance, general miniature mechanism, no noise requirement)

KDN.KAA10XL0 (XL0 precision clearance, medium-small precision transmission, standard noise level)

KDN.KAA10XL0Q (XL0 precision clearance + Q low-noise optimization, noise-sensitive precision continuous rotary mechanism)

KDN.KAA10XL0M (XL0 precision clearance + M surface modification, anti-fretting for intermittent swing)

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

3 Core Performance Advantages

1. KAA miniature lightweight cage design, suited for narrow radial installation space of miniature equipment.

2. XL0 precision clearance delivers excellent rotary accuracy for stable operation of precision mechanisms.

3. Q low-noise optimization: ultra-precise roller sorting and cage clearance control greatly reduce operating vibration and friction noise.

4. High-precision roller set achieves balanced contact stress and smooth low-speed rotation.

5. Ringless integrated assembly supports lightweight integration of transmission units.

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

4 Typical Application Fields

4.1 Low-Noise Miniature Precision Automation Equipment

Hinge pivots of silent electric modules, rotary supports of miniature precision actuators, rotating shafts for laboratory automation tooling

4.2 Small Precision Transmission Components

Supports for silent miniature gearboxes, small constant-speed indexing mechanisms, light-load continuous rotary parts

4.3 Optical & Inspection Instruments

Fine-tuning spindles for visual inspection equipment, precision rotary supports for optical instruments, swing pivots of small measuring devices

4.4 Consumer Intelligent Equipment Precision Parts

Rotary shafts of small silent pan-tilts, miniature transmission units for precision office equipment

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain dust-free clean assembly area; tiny contaminants easily induce abnormal noise. Apply pressing force to cage end face; avoid striking cage sidewall. Manually rotate after assembly to verify smooth motion without jamming or periodic fine abnormal noise. Check hardness and roughness of shaft and housing raceway before assembly.

5.2 Selection Guidance

General miniature mechanism without noise requirement → KDN.KAA10AR0

Medium-small precision continuous transmission with standard noise requirement → KDN.KAA10XL0

Noise-sensitive continuous rotation requiring low vibration → KDN.KAA10XL0Q

Intermittent small swing focusing on anti-fretting corrosion → KDN.KAA10XL0M

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery; evenly apply suitable low-noise grease during assembly. Circulating oil lubrication recommended for long continuous operation. Establish regular re-lubrication schedule; dry running is strictly prohibited. Poor lubrication will directly eliminate low-noise performance.

5.4 Environmental Application Notes

No 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. Q low-noise version is not recommended for frequent impact load scenarios; impacts degrade precision and cause abnormal noise.

6 Fault Identification

Common failure modes: Needle roller surface pitting, shaft raceway scoring, cage window deformation, seizure due to insufficient lubrication, rising abnormal operating noise. Replace complete assembly if cage distortion or roller damage occurs; repair and reuse are forbidden.