1 Model Information & Technical Parameters

Model：KDN.KAA10XL0M

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 M: Wear-resistant modified surface treatment for rollers and cage

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 M modification

Needle roller: Matched M wear-resistant surface treatment

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 act as raceway.

10: Suitable shaft diameter 10 mm.

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

M: Wear-resistant modified surface treatment, improves wear resistance and anti-fretting performance for intermittent swing and low-frequency reciprocating 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. M surface treatment improves surface characteristics but cannot replace adequate lubrication.

2 Structure & Operating Characteristics

Japan NMT KDN.KAA10XL0M miniature compact caged needle roller assembly is upgraded from base model KDN.KAA10XL0. KAA lightweight standard window cage fits limited radial installation space. XL0 precision clearance balances assembly tolerance and rotary accuracy. Uniform M wear-resistant surface treatment for rollers and cage effectively mitigates fretting wear under low-speed swing conditions. Classified needle rollers ensure uniform load distribution and smooth rotation. Pressed steel cage separates rollers to avoid mutual friction, suitable for medium-low speed continuous operation and intermittent small swing applications.

Selection reference:

KDN.KAA10AR0 (AR0 standard clearance, general miniature continuous rotary mechanisms)

KDN.KAA10XL0 (XL0 precision clearance, medium-small precision continuous transmission)

KDN.KAA10XL0M (XL0 precision clearance + M surface modification, precision intermittent swing & reciprocating rotary mechanisms)

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 good rotary accuracy to meet low-vibration requirements of precision mechanisms.

3. Integrated M surface modification enhances wear resistance and restrains fretting corrosion, ideal for small reciprocating swing conditions.

4. High-precision sorted rollers achieve balanced contact stress and stable low-speed rotation.

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

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

4 Typical Application Fields

4.1 Miniature Precision Automation Equipment

Intermittent hinge pivots of small modules, small swing joints of miniature manipulators, rotary supports for precision fixtures

4.2 Small Precision Transmission Components

Supports for miniature gearboxes, small indexing mechanisms, light-load reciprocating oscillating parts

4.3 Optical & Inspection Instruments

Optical fine-tuning rotary mechanisms, swing supports for small testing equipment

4.4 Intelligent Miniature Actuators

Light-load reciprocating rotary units, swing support structures for miniature solenoid valves

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

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

5.2 Selection Guidance

General miniature continuous rotary mechanisms, loose tolerance → KDN.KAA10AR0

Medium-small precision continuous transmission, steady constant-speed operation → KDN.KAA10XL0

Precision intermittent swing, small reciprocating rotation, anti-fretting required → KDN.KAA10XL0M

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant upon delivery; apply suitable grease evenly during assembly. Circulating oil lubrication recommended for long continuous operation. M surface modification does not eliminate lubrication requirement. Schedule regular re-lubrication; dry running is strictly prohibited.

5.4 Environmental Application Notes

Modified surface provides basic rust resistance, not for long-term bare storage. Coat anti-rust oil and seal tightly for prolonged storage. Install end covers and oil seals under dusty and humid conditions. Add buffer structure if frequent impact loads exist.

6 Fault Identification

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