1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 CD/P4ADGC

Model Code Explanation

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

CD: 15° contact angle, high-load D-type optimized geometry, bearing steel material;

P4A: P4A ultra-precision tolerance grade;

DGC: duplex universal matched set, factory medium preload.

Standard Dimension Parameters

Bore d: 30 mm

Outer diameter D: 55 mm

Overall width B: 26 mm

Contact angle: 15 °

Performance Data

Basic dynamic load rating Cr: 23.4 kN

Basic static load rating C0r: 16 kN

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

Full Product Attributes

Contact form: standard two-point contact

Number of bearings per set: 2

Ring structure: integrated inner ring and outer ring

Internal design: high-load D-type optimized design

Universal matching bearing: support back-to-back (<>), face-to-face (><), tandem (>>) layout

Matching configuration: universal match

Quantity in set: 2 bearings

Preload / clearance: medium preload

Tolerance class: P4A precision grade

Material: bearing steel

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication scheme configured on site

Indicative carbon footprint for new product: 0.81 kg CO₂e

Net weight: 0.219 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

Speed note: The 15° contact angle balances limiting speed and axial load capacity. Medium preload balances rotary rigidity and operating temperature rise, suitable for conditions requiring medium axial load and stable long-term precision.

2 Structure & Operating Characteristics

Japan NMT 7006 CD/P4ADGC is a 15° high-load D-type duplex universal matched precision angular contact ball bearing with integrated bearing steel rings. D-type design optimizes quantity and arrangement of rolling elements to improve dynamic and static load ratings.

DGC refers to factory precision dimension-sorted duplex universal matched set without fixed assembly orientation. DB back-to-back, DF face-to-face and DT tandem layouts are optional. Factory preset medium preload delivers higher rigidity than ultra-light preload variants with moderate heat generation. Open construction supports oil-air lubrication and premium high-speed grease; no lubricant pre-filled inside bearings.

The 15° small contact angle retains excellent high-speed performance. Medium preload suppresses spindle deflection and resists alternating cutting loads, providing superior axial rigidity versus ultra-light preload. Bearings separated from different sets cannot be mixed, otherwise matching precision will be lost.

3 Core Performance Advantages

1. High-Load D Geometry + 15° Contact Angle: Optimized rolling element layout greatly increases load capacity while maintaining good high-speed capability.

2. Premium Bearing Steel: Stable metallographic structure and good contact fatigue resistance for long-term continuous machining.

3. Duplex Universal Matched Kit: Flexible assembly layout adaptable to various spindle force conditions.

4. Factory Medium Preload: Balances rigidity and heat generation, suppresses vibration and secures long-term machining precision.

5. P4A Ultra-Precision Grade: Strict control of radial and axial runout to satisfy precision cutting requirements.

6. Open Seal-Free Structure: Eliminates seal friction loss, compatible with oil-air lubrication for outstanding heat dissipation.

4 Typical Application Scenarios

4.1 Precision CNC Lathe & Turn-Mill Spindles: Medium precision turning and turn-mill main spindle units.

4.2 Ball Screw Supports for Machining Centers: Fixed-end bearing for feed-axis ball screws on medium-small machine tools.

4.3 Medium-Sized Precision High-Speed Motor Spindles: Spindle units for mold finishing and high-speed aluminum machining.

4.4 Precision Heavy-Duty Rotary Mechanisms for Automation: Precision indexing rotary tables, heavy-duty precision feed rotary shafts.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision duplex universal matched bearings shall be assembled in dust-free clean environment. Remove all burrs and metal debris on shaft journals, housings and spacers. Controlled thermal mounting is recommended; striking bearing raceways and end faces is prohibited. Only two bearings from the identical set can be paired; cross-set assembly is forbidden. Interference fit must be properly controlled to avoid excessive preload and persistent overheating.

5.2 Matching Layout & Preload Instructions

Universal match supports three duplex configurations freely. Factory medium preload targets working conditions with medium alternating axial load. Select ultra-light preload version for light-load higher speed application, heavy preload variant for heavy shock loads. Custom preload levels available upon request.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearings. Oil-air lubrication is preferred for continuous high-speed cutting; high-grade high-speed grease can be adopted for intermittent machining. Never mix different brands or types of lubricants. Clean lubrication pipelines regularly to prevent impurities entering raceways.

5.4 Speed Parameter Note

Obtain reference limiting speed data from SKF. Match load and rotating speed reasonably under medium preload; avoid long-term operation at full load and maximum speed to slow bearing fatigue.

6 Daily Maintenance & Fault Troubleshooting

Perform multi-stage low-speed running-in after assembly, monitor temperature and vibration in real time; apply cutting load only after stable operation. Open design offers no protection against dust and cutting fluid; external shaft seals must be installed for machining applications.

Maintain steady continuous oil supply to form complete lubricating film on raceways. In case of abnormal temperature rise, continuous vibration growth or periodic abnormal noise, sequentially check interference fit, bearing mounting direction, coaxiality, lubrication supply and contamination ingress. Minimize sudden shock loads to prevent uneven stress damage on rolling elements.