1 Model Information & Technical Parameters

Model：KDN.JHA10XL0K

 

Basic Dimensions (Inch / Metric)

Parameter Inch Metric

Bore diameter (d) 1.000 in 25.400 mm

Outside diameter (D) 1.375 in 34.925 mm

Width (B) 0.250 in 6.350 mm

Radial cross section (H) 0.188 in 4.763 mm

Inner ring groove diameter (d₂) — ≈28.143 mm

Outer ring groove diameter (D₂) — ≈32.36 mm

Ball diameter — 2.381 mm

Contact angle 30°

Performance Data

Parameter Value Unit

Dynamic load rating (radial, CK) 1.1 kN

Static load rating (radial, C₀) 1.29 kN

Static load rating (axial, C₀a) 3.25 kN

Dynamic load rating (moment, Cₘ) 0.0124 kN·m

Static load rating (moment, C₀M) 0.0192 kN·m

Limiting speed 3,000 r/min

Starting torque max. no load 0.0353 N·m

Operating temperature range -30 ~ +110 °C

Technical Attributes

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

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

Sealing: Seal on both sides (NBR rubber seal)

Cage: Non-metallic (GFR nylon / PA12) cage

Pre-lubrication: Grease pre-filled

Material: Bearing steel (52100 chrome steel)

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

Number of rows: Single row

Tolerance class: ABEC-1

Radial clearance: XL0 precision clearance class

 

Logistics & Industry Codes

Net weight: 0.0181 kg (0.035 lbs)

Indicative carbon footprint: 0.03 kg CO₂e

eClass code: 23-05-08-07

UNSPSC code: 31171538

 

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 (0.188 in), Width 1/4 inch (0.250 in)

 

10: Inner diameter 1.0 inch

 

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

 

L: Non-metallic (nylon) cage

 

0: XL0 precision clearance class

 

K: Specific seal or cage design variant (distinguishing from standard XL0 model)

 

Important reminder: This model is a complete sealed thin-section bearing unit — the integral 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 X four-point contact design simultaneously accommodates radial, axial and moment loads.

 

2 Structure & Operating Characteristics

Japan NMT KDN.JHA10XL0K 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.

 

JHA specification indicates a cross-section of 3/16" x 1/4" (0.188 inch radial section, 0.250 inch width). At 1 inch (25.4 mm) bore, the outside diameter is only 34.925 mm (1.375 inches), achieving exceptional space efficiency.

 

Type X four-point contact design is the core technical feature. 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.

 

Integral seal on both sides is a key feature. NBR 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.

 

XL0 precision clearance class ensures high rotational accuracy and low vibration during operation.

 

Suffix K indicates that this model features a specific seal or cage design variant beyond the standard XL0 configuration, distinguishing it from the standard KDN.JHA10XL0 while maintaining the same core performance characteristics.

 

Selection reference:

 

KDN.JHA10CL0 (CL0 clearance, Type C radial contact, double seals)

 

KDN.JHA10XL0 (XL0 clearance, Type X four-point contact, double seals)

 

KDN.JHA10XL0K (XL0 clearance, Type X four-point contact, suffix K indicates specific seal or cage design variant)

 

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" bore, OD is only 1.375" with radial section just 3/16" (4.763 mm). Net weight only 0.0181 kg, ideal for weight-sensitive aerospace and robotics applications.

 

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

 

4. XL0 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. GFR nylon / PA12 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 52100 bearing steel, ABEC-1 tolerance class, fully interchangeable with KAYDON JHA10XL0, RBC JHA10XL0 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 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.