1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 CDGA/HCP4A

Model Code Explanation

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

CDGA: 15° contact angle, high-load D geometry, single matchable bearing, Class A measuring load;

HCP4A: Composite material, P4A ultra-precision tolerance grade.

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

Speed note: Contact SKF to obtain reference achievable rotational speed.

Full Product Attributes

Contact form: standard two-point contact

Number of bearings: 1 (single unit)

Ring structure: integrated inner ring and outer ring

Internal design: high-load D-type optimized design

Matchable configuration: available for back-to-back (<>), face-to-face (><), tandem (>>) layout

Factory duplex set: none (single unit, matched on site)

Preload standard: measured load, Class A

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on site

Indicative carbon footprint for new product: 0.34 kg CO₂e

Net weight: 0.093 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Speed note: The 15° small contact angle delivers excellent high-speed performance. Lightweight composite design reduces rotational inertia for high-speed light-load applications. Supplied as single loose bearing; preload must be precisely adjusted by spacers during assembly.

2 Structure & Operating Characteristics

Japan NMT 7006 CDGA/HCP4A is a 15° high-load D-type single precision angular contact ball bearing with integrated composite rings. D-shaped geometry optimizes rolling element arrangement to maximize load rating under lightweight material condition.

Supplied as single loose bearing without factory preset preload and fixed matched pairs. Users can assemble two or more bearings into DB, DF or DT layout as required. Class A measuring load specification ensures tight dimensional tolerance band, convenient for accurate preload calculation during fitting. Open construction supports oil-air lubrication and high-speed grease; no lubricant pre-filled inside bearing.

Composite material greatly reduces weight compared with bearing steel, lowering centrifugal force and raising limiting speed. The 15° contact angle is optimized for high-speed applications with moderate axial load capacity. Without factory preload, it demands high precision for assembly and spacer machining, suitable for premium equipment allowing on-site accurate preload control. Mixing with bearings of different series or precision grades is prohibited.

3 Core Performance Advantages

1. High-Load D Geometry + 15° Contact Angle: Optimized rolling element layout balances load capacity and high-speed capability.

2. Lightweight Composite Matrix: Reduced rotational inertia, suppress temperature rise at high speed, improve start-stop response.

3. Flexible Single Unit Matching: Supports multiple assembly layouts including DB, DF and DT to satisfy various spindle structures.

4. Class A Measuring Load & P4A Precision: Consistent dimensional accuracy and strict runout control to guarantee rotary precision.

5. Open Seal-Free Construction: Eliminates seal friction loss, excellent heat dissipation, fully compatible with oil-air lubrication.

4 Typical Application Scenarios

4.1 Lightweight High-Speed Precision Motor Spindles: Small engraving spindles, PCB high-speed machining spindles, micro grinding spindles.

4.2 Precision Optical Inspection Rotary Mechanisms: Optical dividing heads, high-speed rotary shafts for vision inspection equipment.

4.3 Feed Shafts for Compact Automation: Miniature precision ball screw supports, small robot joint shafts.

4.4 Laboratory Precision High-Speed Test Spindles: High-speed rotary support units for various precision test benches.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings must be assembled in dust-free clean space. Fully remove burrs and dust on shaft journals, housings and spacers. Controlled thermal mounting is recommended; striking bearing raceways and end faces is forbidden. If duplex/multiplex arrangement is required, select bearings from same production batch. Do not mix with bearings of other series or precision classes. Spacer thickness requires precision machining to accurately control axial preload.

5.2 Matching Layout & Preload Instructions

No factory preload. Preload is regulated by spacer and lock nut. Ultra-light, medium and heavy preload can be realized according to working conditions. Adopt low preload for high-speed light load; increase preload properly under alternating cutting loads.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. Oil-air lubrication preferred for continuous long-term high-speed running; high-grade low-viscosity high-speed grease for intermittent operation. Never mix different lubricant types. Maintain lubrication pipelines regularly to prevent contaminants entering raceways.

5.4 Speed Parameter Note

Request limiting speed reference data from SKF. Composite bearings feature good thermal performance, avoid continuous operation under shock load to prevent surface layer damage.

6 Daily Maintenance & Fault Troubleshooting

Carry out staged low-speed running-in after assembly; monitor temperature and vibration continuously. High-speed operation is permitted only after stable readings. Open design offers no dust or fluid protection; external shaft seals must be installed in dusty or cutting fluid environments.

Supply lubricant steadily to form complete oil film on raceways. When abnormal temperature rise, growing vibration or noise occurs, sequentially verify spacer precision, preload value, bearing mounting direction, coaxiality, lubrication status and contamination ingress. Minimize frequent severe shock loads.