1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 ACEGA/HCP4AL1

Model Code Explanation

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

AC: 25° contact angle;

EGA: High-speed E-type internal raceway geometry, Grade A preload based on measured load;

HC: Composite bearing material;

P4A: P4A ultra-precision tolerance class;

L1: Specification with load measurement control.

Standard Dimension Parameters

Bore d: 30 mm

Outer diameter D: 55 mm

Width B: 13 mm

Contact angle: 25 °

Performance Data

Basic dynamic load rating Cr: 8.84 kN

Basic static load rating C0r: 5 kN

Speed note: Contact SKF for data on achievable rotational speed.

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-speed E optimized design

Compatible duplex arrangement: Yes, back-to-back (<>), face-to-face (><), tandem (>>) available

Duplex layout: None, supplied as single unit for on-site combination

Preload specification: controlled by measured load, Grade A

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication supplied during assembly

Key feature: suitable for direct oil-air lubrication

Indicative carbon footprint for new product: 0.4 kg CO₂e

Net weight: 0.107 kg

eClass code: 23-05-08-03

Note: The 25° contact angle provides balanced axial load capacity. High-speed E-type raceway reduces friction heat at high rotational speed. Composite rings feature lighter weight and superior thermal stability. Supplied as single loose bearing without factory pre-matching, enabling flexible on-site duplex configurations according to spindle design. Grade A preload is calibrated via measured load for stable preload accuracy. Open construction allows direct oil-air lubricant delivery to raceways. No pre-filled grease, centralized lubrication system is mandatory. External dust protection must be arranged on equipment side.

2 Structure & Operating Characteristics

Japan NMT 7006 ACEGA/HCP4AL1 is a 7006 size 25° high-speed E-type precision single angular contact bearing with finely machined integrated composite rings. The high-speed E geometry is optimized to minimize friction heat under high-speed operation. The 25° contact angle supports combined radial and bidirectional axial loads.

Open non-sealed design creates unobstructed flow path, enabling direct oil-air lubrication to reach rolling contact zones for effective cooling. Bearings are delivered individually without factory duplexing. Customers can assemble multiple units into back-to-back, face-to-face or tandem setups based on spindle rigidity and load direction requirements.

Preload Grade A is controlled by measured load method, supporting accurate axial preload adjustment during assembly. Composite material lowers bearing weight and moderates temperature variation, ideal for light-weight high-speed precision spindle designs.

3 Core Performance Advantages

1. 25° contact angle + high-speed E raceway: Low heat generation at high speed, balanced radial and axial capacity for long-duration high-speed operation.

2. P4A ultra-precision grade: Strict rotary runout control to sustain consistent machining accuracy.

3. Integrated composite rings: Lightweight and excellent thermal stability for light-duty high-speed spindles.

4. Flexible duplex options: Three typical arrangements available to match diverse spindle layouts.

5. Grade A preload via measured load: Consistent preload parameters for easier assembly tuning.

6. Optimized for direct oil-air lubrication: Open passage ensures effective cooling medium delivery to contact surfaces for high-speed service.

4 Typical Application Scenarios

4.1 Small high-speed engraving & milling spindles, PCB drilling machine spindles: Lightweight high-speed spindles equipped with centralized oil-air lubrication.

4.2 High-speed internal grinding spindles, compact precision grinding units: Continuous high-speed operation requiring tight temperature control.

4.3 High-speed rotary shafts for test equipment, precision automated rotary mechanisms: Compact structure demanding flexible bearing arrangement schemes.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings shall be assembled in dust-free clean workshops. Remove all burrs and debris on shaft and housing mating surfaces. Controlled thermal mounting is recommended; never strike bearing rings or rolling elements directly. Multiple single bearings can be combined; bearings from the same batch are preferred for duplex assembly to guarantee precision consistency.

5.2 Matching & Preload Instructions

No factory preset duplex configuration. Three layout types can be assembled on site. Grade A preload is based on measured load; select proper spacers to achieve target preload during fitting. Different duplex layouts differ in stiffness, moment resistance and axial load capacity, perform mechanical verification at design stage.

5.3 Lubrication Matching Solutions

No pre-filled lubricant. Direct oil-air lubrication is preferred to fully utilize high-speed capability. High-speed grease can be adopted for intermittent low-speed operation, while oil-air system is recommended for continuous high-speed running. Avoid mixing different types of lubricants and inspect supply pipelines regularly.

5.4 Speed Parameter Note

Obtain limiting speed reference data from SKF. Strict temperature control is required under high-speed working conditions; ensure continuous lubrication cooling and maintain sufficient safety margin against actual loads.

6 Daily Maintenance & Fault Troubleshooting

Carry out multi-stage low-speed running-in after assembly; gradually raise speed to rated value only after temperature and vibration stabilize. Open bearings have no inherent dust resistance; the machine must be fitted with labyrinth or contact dust seals.

Maintain stable lubricant supply to prevent raceway damage caused by dry friction. In case of abnormal temperature rise, vibration or noise, sequentially check lubrication supply, mounting coaxiality, preload value, operating load and dust seal status.