1 Model Information & Technical Parameters

Model：KDN.KAA17XL0K

 

Basic Dimensions (Inch / Metric)

Parameter Inch Metric

Bore diameter (d) 1.750 in 44.450 mm

Outside diameter (D) 2.125 in 53.975 mm

Width (B) 0.1875 in 4.763 mm

Radial cross section (H) 0.1875 in 4.763 mm

Inner ring shoulder diameter (d₁) — ≈48.006 mm

Outer ring shoulder diameter (D₁) — ≈50.419 mm

Ball diameter — 2.381 mm

Fillet radius (r) 0.015 in 0.381 mm

Contact angle 30°

Performance Data

Parameter Value Unit

Dynamic load rating (radial, AKMI) 1.42 kN

Static load rating (radial) 2.05 kN

Static load rating (axial) 5.07 kN

Dynamic load rating (moment) 0.0262 kN·m

Static load rating (moment) 0.0497 kN·m

Limiting speed ≈8,260 (grease) / 10,320 (oil) r/min

Operating temperature range -30 ~ +110 °C

Note: Load data sources include AKMI and KAYDON/RBC equivalent models. Variations between manufacturers may result from different testing standards and calculation methods.

 

Technical Attributes

Supply form: Open thin-section four-point contact ball bearing (with inner and outer rings)

Structure type: KDN.KAA constant-section thin-section four-point contact ball bearing (Type X)

Sealing: Without seal (open), suffix K indicates no seals or shields 

Cage: GFR nylon (fiberglass reinforced nylon) 

Pre-lubrication: Grease pre-filled 

Material: AISI 52100 chrome steel

Load direction: Radial + axial (both directions) + moment (combined loads)

Assembly type: Conrad-type (gothic arch raceways, four-point contact)

Number of rows: Single row

Tolerance class: ABEC-1

Radial clearance: XL0 precision clearance class (0.0000 – 0.0005 inch)

 

Logistics & Industry Codes

Net weight: 0.0227 kg (0.05 lbs)

Indicative carbon footprint: 0.09 kg CO₂e

eClass code: 23-05-08-07

UNSPSC code: 31171538

 

Suffix Explanation

KDN: KAYDON Reali-Slim® thin section bearing series identifier

 

KAA: Radial cross section 3/16 inch (0.1875 in) × Width 3/16 inch (0.1875 in)

 

17: Inner diameter 1.75 inches

 

X: Four-point contact ball bearing (Type X), for combined loads

 

L: Non-metallic cage (GFR nylon)

 

0: XL0 precision clearance class (ABEC-1, KAYDON Class 1)

 

K: No seals or shields (open) — in KAYDON nomenclature, suffix K indicates open-type construction without seals or shields

 

Important reminder: This model is an open thin-section bearing; suffix K indicates no seals or shields. Although pre-lubricated at shipment， regular lubrication replenishment is required during long-term operation based on actual conditions. Operating temperature range: -30°C to +110°C. Type X four-point contact design simultaneously accommodates radial, axial and moment loads.

 

2 Structure & Operating Characteristics

Japan NMT KDN.KAA17XL0K is a constant-section thin-section four-point contact ball bearing (Type X) . Its core design principle: the cross-section remains constant as the bore diameter increases. This allows designers to use the same thin-section bearing series across different rotating component sizes, greatly simplifying design and selection while achieving significant space and weight savings.

 

KAA specification indicates a cross-section of 3/16" x 3/16" (0.1875 inch radial section, 0.1875 inch width). At 1.75 inch (44.45 mm) bore, the outside diameter is only 53.975 mm (2.125 inches), achieving exceptional space efficiency.

 

Type X four-point contact design is the core technical feature. With gothic arch raceway geometry, balls contact the raceways at four points, simultaneously accommodating radial loads, bidirectional axial loads, and moment loads. A single bearing replaces the need for paired angular contact ball bearings in face-to-face or back-to-back arrangements, significantly reducing axial space. The 30° contact angle ensures stable operation under various load directions.

 

Suffix K (open no-seal construction) is an important feature. In KAYDON nomenclature, suffix K indicates open-type construction without seals or shields. This allows users to flexibly select grease or circulating oil lubrication based on actual operating conditions, suitable for applications requiring customized lubrication solutions or periodic maintenance. Important: Although pre-lubricated at shipment, the open construction means lubricant may volatilize or deplete over time, requiring regular maintenance.

 

XL0 precision clearance class (0.0000 – 0.0005 inch radial clearance) ensures high rotational accuracy and low vibration during operation.

 

Non-metallic cage (GFR nylon/fiberglass reinforced nylon) combines light weight with excellent wear resistance, effectively separating balls and reducing operating noise.

 

Selection reference:

 

KDN.KAA17CL0 (CL0 clearance, Type C radial contact, open, for pure radial loads)

 

KDN.KAA17XL0 (XL0 clearance, Type X four-point contact, open, for combined loads)

 

KDN.KAA17XL0K (XL0 clearance, Type X four-point contact, suffix K indicates open no-seal construction)

 

3 Core Performance Advantages

1. Type X four-point contact design delivers comprehensive combined load capacity. Simultaneously accommodates radial, axial and moment loads — a single bearing replaces a pair of angular contact ball bearings, significantly saving axial space.

 

2. Constant thin-section design delivers ultimate space and weight savings. Single cross-section remains constant as bore increases — at 1.75" bore, OD is only 2.125" with radial section just 3/16" (4.763 mm). Net weight only 0.0227 kg, ideal for weight-sensitive aerospace and robotics applications.

 

3. Open construction (suffix K) enables flexible lubrication customization. No-seal design allows users to select grease or oil lubrication based on actual conditions, adapting to diverse application requirements.

 

4. XL0 precision clearance ensures smooth and accurate operation. Radial clearance 0.0000–0.0005 inch meets stringent requirements of precision instruments, medical equipment and other high-accuracy applications for low vibration and high rotational precision.

 

5. High-strength non-metallic cage delivers low friction and high reliability. GFR nylon cage combines light weight with excellent wear resistance, effectively separating balls and reducing operating noise.

 

6. High precision manufacturing with international standard interchangeability. Made of AISI 52100 bearing steel, ABEC-1 tolerance class, fully interchangeable with KAYDON KAA17XL0, RBC KAA17XL0-RBC, INA CSXAA17, SSB RAA17XL0 and other equivalent models.

 

4 Typical Application Fields

4.1 Industrial Robotics

Lightweight robot arm joints, automation module rotary supports, precision assembly equipment — Type X design effectively handles moment loads at joints while supporting radial loads.

 

4.2 Aerospace

Satellite mechanisms, lightweight precision components for aircraft, avionics rotary mechanisms — thin and lightweight characteristics make it ideal for aerospace applications.

 

4.3 Medical Equipment

Surgical robots, CT/MRI and other advanced imaging equipment rotating components — low friction and high running accuracy meet the stringent reliability requirements of medical devices.

 

4.4 Precision Instruments & Optical Equipment

Test instrument rotary supports, optical platform fine-tuning mechanisms, precision positioning devices.

 

4.5 Industrial Machinery & Automation

Space-constrained compact equipment, material handling systems, packaging machinery.

 

5 Assembly Specifications & Usage Guidelines

5.1 Pre-installation Inspection

Verify model and specifications match design requirements. Inspect bearing appearance to ensure no damage or corrosion. Check shaft and housing dimensional tolerances and surface finish against design specifications.

 

5.2 Installation Procedure

Install in a clean environment to prevent dust and contaminants from entering the bearing. Use press-fit method with force applied evenly to the end face of the fitted ring. Never apply force through rolling elements or cage. Keep bearing level during installation and press slowly to avoid tilting that could score raceways.

 

5.3 Lubrication Maintenance

This model comes pre-lubricated at shipment, but regular inspection and lubrication replenishment are required during long-term operation based on actual conditions. Grease lubrication limiting speed is approximately 8,260 r/min; oil lubrication limiting speed is approximately 10,320 r/min. High-quality lithium or synthetic grease is recommended. Establish regular oil replenishment schedule; dry running is strictly forbidden. Open construction (suffix K) means no sealing protection — special attention must be paid to lubricant loss and external contamination.

 

5.4 Environmental Considerations

Operating temperature range: -30°C to +110°C. As this bearing is open construction (no seals), additional sealing protection at the equipment level is mandatory in high-dust, high-humidity or chemically corrosive environments. Avoid subjecting the bearing to impact loads beyond design limits.

 

6 Fault Identification

Common failure modes: Rolling element or raceway fatigue pitting, abnormal operating noise increase, significant rotation resistance increase, excessive temperature rise, seizure caused by poor lubrication. If any abnormality occurs, inspect and replace the bearing promptly.