1 Model Information & Technical Parameters

Model：KDN.KAA10XL0

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

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

Coating: None

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 precision than standard AR series, suitable for medium-small precision transmission mechanisms.

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 lead to early pitting, raceway scoring or seizure. Only pure radial load is allowed; axial load is forbidden. Open construction requires external lubrication and housing dust protection; dry running is prohibited. Do not strike cage directly during assembly, pressing force should act on cage end face.

2 Structure & Operating Characteristics

Japan NMT KDN.KAA10XL0 miniature compact caged needle roller assembly adopts KAA lightweight standard window cage for limited small-diameter installation space. XL0 precision clearance balances assembly tolerance and rotary accuracy. Classified needle rollers ensure uniform load distribution and smooth rotation. Pressed steel cage separates rollers to avoid mutual friction and enables stable continuous medium-low speed operation.

Selection reference:

KDN.KAA10AR0 (AR0 standard clearance for general miniature mechanisms)

KDN.KAA10XL0 (XL0 precision clearance for medium-small precision transmission & testing equipment)

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

3 Core Performance Advantages

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

2. XL0 precision clearance grade delivers excellent rotary accuracy to meet low-vibration demand of medium-small precision mechanisms.

3. High-precision sorted rollers realize balanced contact stress and stable low-speed rotation.

4. Ringless integrated assembly structure supports lightweight integration of transmission units.

5. Open construction supports long-term grease lubrication and circulating oil lubrication.

6. Compact dimension suitable for mass assembly of miniature automation equipment.

4 Typical Application Fields

4.1 Miniature Automation Equipment

Hinge pivots of small electric modules, oscillating 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 Testing & Instrument Equipment

Rotary supports for small test instruments, fine-tuning rotary mechanisms for optical equipment

4.4 Small Household Appliances & Smart Equipment Transmission Parts

Light-load miniature rotary mechanisms, support points for miniature actuators

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Keep assembly area clean to prevent dust entering roller gaps. Apply pressing force to cage end face, avoid hitting cage sidewall. Manually rotate after assembly to confirm smooth rotation without jamming or periodic abnormal noise. Verify hardness and roughness of shaft and housing raceway before assembly.

5.2 Selection Guidance

Ordinary miniature mechanisms, loose assembly tolerance → KDN.KAA10AR0

Medium-small precision equipment requiring stable low vibration → KDN.KAA10XL0

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

5.3 Lubrication Maintenance Instruction

No pre-filled lubricant on delivery; evenly apply suitable grease during assembly. Circulating oil lubrication is recommended for long-term continuous operation. Set regular oil replenishment schedule; dry running is strictly forbidden.

5.4 Environmental Application Notes

No anti-rust coating. Apply anti-rust oil and seal tightly for long-term storage. Equip 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 caused by poor lubrication. Replace whole assembly when cage distortion or roller damage occurs; repair and reuse are not allowed.