1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 CB/P4ADGA

Model Code Explanation

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

CB: 15° contact angle, high-speed B-type optimized geometry, bearing steel material;

P4A: P4A ultra-precision tolerance grade;

DGA: duplex universal matched set, factory ultra-light 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: 10.4 kN

Basic static load rating C0r: 8.3 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-speed B-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: ultra-light 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: 0.93 kg CO₂e

Net weight: 0.252 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

Speed note: The 15° contact angle focuses on high limiting speed with relatively weak axial load capacity. Ultra-light preload reduces operating friction, suitable for applications with low axial load and continuous high speed. Axial load should be verified during selection.

2 Structure & Operating Characteristics

Japan NMT 7006 CB/P4ADGA is a 15° high-speed B-type duplex universal matched precision angular contact ball bearing with integrated bearing steel rings. B-type design optimizes rolling element and cage shape to reduce friction and churning loss at high speed.

DGA stands for 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. Ultra-light preload preset at factory ensures low frictional heat generation. Open construction supports oil-air lubrication and premium high-speed grease; no lubricant pre-filled inside bearings.

Characteristics of 15° small contact angle: higher limiting speed compared with 25° / 30° variants, but lower axial load capacity and anti-tilting performance. Ultra-light preload maximizes speed potential and is not recommended for heavy alternating axial load. Bearings from different sets cannot be mixed after separation, which impairs matching accuracy.

3 Core Performance Advantages

1. High-Speed B Geometry + 15° Contact Angle: Small contact angle lowers rolling loss and delivers excellent limiting speed.

2. High-purity Bearing Steel: Homogeneous microstructure, sufficient rigidity and stable fatigue resistance.

3. Duplex Universal Matched Kit: Flexible assembly layout to satisfy different spindle load requirements.

4. Factory Ultra-Light Preload: Low operating temperature rise, ideal for long continuous high-speed operation.

5. P4A Ultra-Precision Grade: Strict control of rotary runout to guarantee precision machining accuracy.

6. Open Seal-Free Structure: Eliminates seal friction, compatible with oil-air lubrication for superior heat exchange.

4 Typical Application Scenarios

4.1 Precision CNC Lathe & Swiss-Type Main Spindles: Small precision turning equipment, sliding head machine high-speed spindle units.

4.2 High-Speed Ball Screw Support Bearings: Fixed-end supports for small high-speed feed-axis ball screws on machine tools.

4.3 Light-Duty Precision High-Speed Motor Spindles: Micro-machining, small engraving light-load high-speed spindles.

4.4 Inspection Equipment & Automated Precision Rotary Shafts: Optical testing spindles, precision winding high-speed rotary mechanisms.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision duplex universal matched bearings must be assembled in dust-free clean workshop. Remove all burrs and metal chips on shaft journals, housings and spacers. Controlled thermal mounting is recommended; striking bearing end faces and raceways is prohibited. Only bearings within the identical set can be combined; cross-set mixing is forbidden. Excessive interference fit causes abnormal preload and overheating.

5.2 Matching Layout & Preload Instructions

Universal match supports three duplex configurations freely. Factory ultra-light preload targets high-speed conditions with minor axial load. Switch to medium preload variant if axial load is heavy. Contact manufacturer for customized preload levels.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearings. Oil-air lubrication is preferred for long continuous high-speed service; low-viscosity high-speed grease can be adopted for intermittent operation. Never mix different lubricant brands. Maintain lubrication pipelines regularly to prevent foreign matter entering raceways.

5.4 Speed Parameter Note

Request reference limiting speed data from SKF. Strictly limit axial load during continuous high-speed running; reduce operating speed when axial load rises to avoid slippage and vibration deterioration.

6 Daily Maintenance & Fault Troubleshooting

Carry out staged low-speed running-in after assembly, continuously monitor temperature and vibration. Loading is allowed only under stable operating conditions. Open design lacks dust and cutting fluid resistance; multi-stage external shaft seals must be installed for harsh working environments.

Ensure consistent oil supply to form complete lubricant film on raceways. In case of sharp temperature rise, growing vibration or periodic abnormal noise, sequentially check interference fit, bearing mounting direction, coaxial accuracy, lubrication supply and contamination ingress. Avoid transient shock loads to prevent rolling element damage caused by unbalanced preload.