1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 CD/HCP4A

Model Code Explanation

7006: Standard boundary dimension of 70 series precision angular contact ball bearing;

C: 15° contact angle;

D: High-load D-type internal raceway geometry;

HC: Composite bearing material;

P4A: P4A ultra-precision tolerance class.

Standard Dimension Parameters

Bore d: 30 mm

Outer diameter D: 55 mm

Width B: 13 mm

Contact angle: 15 °

Performance Data

Basic dynamic load rating Cr: 14.3 kN

Basic static load rating C0r: 8 kN

Permissible rotational speed: 38,000 r/min (grease lubrication), 56,000 r/min (oil-air lubrication)

Full Product Attributes

Contact form: standard two-point contact

Number of bearing rows: 1 (single independent bearing unit)

Ring structure: integrated inner ring and outer ring

Internal design: high-load D optimized design

Compatible duplex arrangement: No

Duplex layout: None, supplied as single unit

Preload specification: Not applicable

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication supplied during assembly

Indicative carbon footprint for new product: 0.34 kg CO₂e

Net weight: 0.093 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Note: The 15° contact angle delivers outstanding radial load capacity. High-load D-type raceway enlarges contact area to improve load rating. Composite rings are lightweight with stable thermal performance. Supplied individually without factory duplexing. Open design eliminates seal friction and supports both grease and oil-air lubrication. No pre-filled lubricant; centralized lubrication system is required. External dust protection shall be installed on equipment.

2 Structure & Operating Characteristics

Japan NMT 7006 CD/HCP4A is a 7006 size 15° high-load D-type precision single angular contact bearing with finely finished integrated composite rings. The 15° contact angle prioritizes radial load capacity while accepting moderate bidirectional axial loads. High-load D geometry optimizes contact zone to raise overall load rating, ideal for spindles dominated by radial force.

Open non-sealed construction minimizes drag torque. Two lubrication modes are available: high-speed grease lubrication up to 38,000 r/min, and continuous ultra-high-speed oil-air lubrication up to 56,000 r/min. Bearings are delivered separately without factory duplex sets, allowing customers to configure assemblies freely.

Composite material reduces bearing weight and moderates temperature fluctuation, balancing load capacity and lightweight requirements for small-to-medium precision spindles and high-speed rotary mechanisms.

3 Core Performance Advantages

1. 15° contact angle + high-load D raceway: Superior radial load capacity with high basic load ratings for radial-dominant applications.

2. Calibrated speed for two lubrication types: Clear speed limits for grease and oil-air lubrication to simplify equipment design selection.

3. P4A ultra-precision grade: Strict rotary runout control for sustained operational accuracy.

4. Integrated composite rings: Lightweight and thermally stable, excellent for lightweight spindle designs.

5. Open unsealed design: No seal resistance, enabling smooth lubricant delivery to rolling contact surfaces.

4 Typical Application Scenarios

4.1 Small engraving & milling spindles, high-speed PCB drilling spindles: Heavy radial cutting loads, supporting both medium and ultra-high-speed lubrication schemes.

4.2 Precision grinding spindles, compact high-speed grinder spindles: High requirements on load capacity, rotational accuracy and wide speed range.

4.3 High-speed rotary shafts for inspection equipment, precision automated rotary units: Compact structure with flexible lubrication options.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings must be assembled in dust-free clean areas. Remove all burrs and debris on shaft and housing mating surfaces. Controlled thermal mounting is recommended. Never strike bearing rings or rolling elements directly. If multiple bearings are combined, use products from the same batch to maintain precision consistency.

5.2 Matching & Preload Instructions

Supplied as single loose bearing without factory duplex configuration and default preload. If axial preload is required after assembly, dedicated spacers must be designed and adjusted on site.

5.3 Lubrication Matching Solutions

No pre-filled lubricant. Premium high-speed grease is suitable for intermittent medium-high speed operation with maximum speed 38,000 r/min. Continuous ultra-high-speed service recommends oil-air lubrication up to 56,000 r/min. Avoid mixing different lubricant types and maintain lubrication pipelines periodically.

5.4 Speed Parameter Note

Stated speeds serve as reference values. Maintain sufficient safety margin against load, temperature and cooling conditions. Reduce operating speed under heavy load to prevent raceway thermal damage.

6 Daily Maintenance & Fault Troubleshooting

Implement staged low-speed running-in after assembly; gradually increase speed to operating level once temperature and vibration stabilize. Open bearings lack dust resistance, so labyrinth seals or dust shields must be fitted on machinery.

Ensure consistent lubricant supply to avoid dry friction. When abnormal temperature rise, vibration or noise occurs, inspect lubrication supply, mounting coaxiality, preload value, applied load and integrity of dust seals sequentially.