1 Model Information & Technical Parameters

Model：KDN.JHA15CL0A

 

Basic Dimensions (Inch / Metric)

Parameter Inch Metric

Bore diameter (d) 1.500 in 38.100 mm

Outside diameter (D) 1.875 in 47.625 mm

Width (B) 0.250 in 6.350 mm

Radial cross section (H) 0.1875 in 4.763 mm

Inner ring groove diameter (d₂) — ≈40.843 mm

Outer ring groove diameter (D₂) — ≈45.06 mm

Ball diameter — 2.381 mm

Contact angle 0° (radial contact)

Performance Data

Parameter Value Unit

Dynamic load rating (radial) 1.47 kN

Static load rating (radial) 1.54 kN

Limiting speed 4,300 r/min

Starting torque max. no load 0.04 N·m

Operating temperature range -30 ~ +110 °C

Technical Attributes

Supply form: Complete thin-section radial contact ball bearing with integral contact seal on both sides (with inner and outer rings)

Structure type: KDN.JHA constant-section thin-section radial contact ball bearing (Type C)

Sealing: Seal on both sides (contact seal) 

Cage: Non-metallic

Pre-lubrication: Grease pre-filled

Material: Bearing steel (AISI 52100 chrome steel)

Load direction: Primarily radial, with some axial load capacity in both directions

Number of rows: Single row

Tolerance class: ABEC-1

Radial clearance: CL0 precision clearance class

 

Logistics & Industry Codes

Net weight: 0.0236 kg

Indicative carbon footprint: 0.09 kg CO₂e

eClass code: 23-05-08-07

UNSPSC code: 31171502

 

Suffix Explanation

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

 

J: Steel rings and balls, seal on both sides

 

HA: Radial cross section 3/16 inch (0.1875 in), Width 1/4 inch (0.250 in)

 

15: Inner diameter 1.5 inches

 

C: Radial contact ball bearing (Type C), primarily for radial loads

 

L: Non-metallic cage

 

0: CL0 precision clearance class

 

A: Specific design variant code (distinguishing from standard CL0 model, potentially representing optimized seal structure, cage material or internal geometry)

 

Important reminder: This model is a complete sealed thin-section bearing unit — the integral contact seal on both sides comes with pre-filled grease and is ready for direct installation. Do not remove the seals during installation to prevent grease leakage and contaminant ingress. Operating temperature range: -30°C to +110°C. Type C radial contact design primarily accommodates radial loads with some bidirectional axial load capacity.

 

2 Structure & Operating Characteristics

Japan NMT KDN.JHA15CL0A is a constant-section thin-section radial contact ball bearing (Type C) . 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.

 

JHA specification indicates a cross-section of 3/16" x 1/4" (0.1875 inch radial section, 0.250 inch width). At 1.5 inch (38.1 mm) bore, the outside diameter is only 47.625 mm (1.875 inches), achieving exceptional space efficiency.

 

Type C radial contact design is the fundamental technical feature. As a single-row radial ball bearing with Conrad-type assembly, it accommodates radial loads and some axial loads in both directions. The standard deep groove raceway design ensures stable operation under combined radial and light thrust loads.

 

Integral contact seal on both sides is a key feature. Contact seals effectively prevent dust, moisture and other contaminants from entering the bearing while retaining the pre-filled grease. This significantly extends maintenance-free service life, particularly suitable for enclosed equipment where frequent relubrication is impractical.

 

CL0 precision clearance class ensures high rotational accuracy and low vibration during operation.

 

Suffix A indicates that this model features a specific design variant beyond the standard CL0 configuration, distinguishing it from the standard KDN.JHA15CL0, potentially with optimized seal structure, cage material or internal geometry to meet differentiated application requirements.

 

Selection reference:

 

KDN.JHA15CL0 (CL0 clearance, Type C radial contact, double seals)

 

KDN.JHA15CL0A (CL0 clearance, Type C radial contact, suffix A indicates specific design variant)

 

KDN.JHA15XL0 (XL0 clearance, Type X four-point contact, for combined loads)

 

3 Core Performance Advantages

1. Type C radial contact design delivers stable and reliable load capacity. Primarily accommodates radial loads while handling some axial loads in both directions. Conrad-type deep groove raceway design ensures stable operation under combined radial and light thrust loads.

 

2. Constant thin-section design delivers ultimate space and weight savings. Single cross-section remains constant as bore increases — at 1.5" bore, OD is only 1.875" with radial section just 3/16" (4.763 mm). Net weight only 0.0236 kg, ideal for weight-sensitive aerospace and robotics applications.

 

3. Integral contact seal on both sides enables maintenance-free long-life operation. Pre-filled with grease; contact seals retain lubricant while blocking contaminants. Significantly reduces maintenance frequency and total lifecycle cost.

 

4. CL0 precision clearance ensures smooth and accurate operation. 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. Non-metallic 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 JHA15CL0, RBC LJHA15CL0 and other equivalent models.

 

4 Typical Application Fields

4.1 Industrial Robotics

Lightweight robot arm joints, automation module rotary supports, precision assembly equipment — Type C design handles some axial loads in both directions 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 seals are intact without damage or deformation. 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 damage seals or score raceways.

 

5.3 Lubrication Maintenance

This model comes pre-filled with grease — no additional lubricant is required at installation. Under normal operating conditions, long maintenance-free operation is achievable. For harsh environments or heavy loads, establish periodic inspection and relubrication schedule based on actual conditions. Do not remove seals, as this will cause grease leakage and contaminant ingress.

 

5.4 Environmental Considerations

Operating temperature range: -30°C to +110°C. Although the bearing is sealed, additional protective measures at the equipment level are recommended in high-dust, high-humidity or chemically corrosive environments. Avoid subjecting the bearing to impact loads or axial overload beyond design limits.

 

6 Fault Identification

Common failure modes: Seal aging or damage leading to grease leakage and contaminant ingress, rolling element or raceway fatigue pitting, abnormal operating noise increase, significant rotation resistance increase, excessive temperature rise. If any abnormality occurs, inspect and replace the bearing promptly. Do not attempt to repair damaged seals — replace the entire bearing assembly.