1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 ACE/HCP4ADGA

Model Code Explanation

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

ACE: 25° contact angle, high-speed E-type optimized geometry, composite bearing material;

HCP4A: 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: 25 °

Performance Data

Basic dynamic load rating Cr: 14.3 kN

Basic static load rating C0r: 10 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 E-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: composite material

Coating: uncoated

Seal: open type without seals

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

Indicative carbon footprint for new product: 0.71 kg CO₂e

Net weight: 0.191 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Speed note: Ultra-light preload prioritizes limiting speed with low friction and controllable temperature rise. Load capacity is relatively low, suitable for continuous high-speed light-load conditions. Axial load must be carefully verified during selection.

2 Structure & Operating Characteristics

Japan NMT 7006 ACE/HCP4ADGA is a 25° high-speed E-type duplex universal matched precision angular contact ball bearing with integrated rings and composite rolling assemblies. E-type design optimizes rolling element and cage geometry to reduce churning resistance and frictional heat at high rotating speed.

DGA represents factory dimension-sorted duplex universal matched set without fixed assembly orientation. Users can select DB, DF or DT layout as required. Ultra-light preload preset at factory delivers minimal friction loss. Open design supports oil-air lubrication and high-speed grease; no pre-filled lubricant inside bearings.

Ultra-light preload maximizes permissible rotating speed, yet axial rigidity, anti-tilting capacity and load rating are lower compared to medium/heavy preload variants. Bearings from different sets cannot be mixed after splitting, which will invalidate matching accuracy.

3 Core Performance Advantages

1. High-Speed E Geometry + 25° Contact Angle: Specialized rolling system optimization lowers heat generation, enabling long-duration ultra-high speed operation.

2. Composite Bearing Assembly: Lower self-weight and centrifugal force for enhanced high-speed stability.

3. Duplex Universal Matched Kit: Flexible assembly with multiple duplex stacking layouts adaptable to different spindle loads.

4. Factory Ultra-Light Preload: Minimum friction and excellent thermal performance, dedicated to continuous high-speed light-load applications.

5. P4A Ultra-Precision Grade: Strict control of radial and axial runout to sustain high rotary accuracy.

6. Open Seal-Free Structure: Eliminates seal friction loss and improves heat exchange under oil-air lubrication.

4 Typical Application Scenarios

4.1 High-Speed Mold Engraving & Milling Spindles: High-speed precision engravers, small CNC engraving-milling motor spindles.

4.2 Small Precision Grinding Spindles: Micro grinding, small hole grinding high-speed wheel shafts.

4.3 Laboratory & Automated High-Speed Rotary Units: High-speed test spindles, precision winding, high-speed polishing mechanisms.

4.4 Light-Duty High-Speed Ball Screw Supports: Support ends for small high-speed feed-axis ball screws.

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 space. Remove all burrs and debris on shaft journals, housings and spacers. Low-temperature controlled thermal mounting is recommended. Composite components must avoid violent impact and local overheating. Only bearings within the identical set can be combined; cross-set mixing prohibited. Excessive interference fit will cause abnormal preload and overheating.

5.2 Matching Layout & Preload Instructions

Universal match enables free selection of three duplex configurations. Factory ultra-light preload targets light-load high-speed service and is not recommended for heavy-duty conditions. Contact manufacturer for customized preload grades if required.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearings. Oil-air lubrication is preferred for continuous ultra-high speed operation; high-speed low-viscosity grease can be adopted for intermittent service. Do not mix different lubricant brands. Clean lubrication pipelines regularly to prevent impurities entering raceways.

5.4 Speed Parameter Note

Obtain reference limiting speed data from SKF. Strictly limit axial load during continuous high-speed operation. Reduce rotational speed when load increases to avoid preload failure and vibration growth.

6 Daily Maintenance & Fault Troubleshooting

Implement gradual low-speed running-in after assembly, continuously monitor temperature and vibration; apply load only under stable conditions. Open construction lacks dust and fluid protection, external shaft sealing must be fitted for machining environments.

Maintain steady oil supply to form complete oil film on raceways. In case of rapid temperature rise, persistent vibration or abnormal noise, sequentially check interference fit, bearing orientation, coaxial accuracy, lubrication condition and contamination ingress. Avoid shock loads to prevent slippage caused by unbalanced preload.