1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7006 FEGA/HCP4A

Model Code Explanation

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

FEGA: 18° contact angle, high-speed E internal profile, Grade A measured load specification;

HCP4A: HCP4A ultra-precision tolerance class.

Standard Dimension Parameters

Bore d: 30 mm

Outer diameter D: 55 mm

Width B: 13 mm

Contact angle: 18 °

Performance Data

Basic dynamic load rating Cr: 9.23 kN

Basic static load rating C0r: 5.2 kN

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

Full Product Attributes

Contact form: standard two-point contact

Number of bearings: 1 (single unit bearing)

Ring structure: integrated inner ring and outer ring

Internal design: high-speed E optimized design

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

Duplex layout: None (single unit, matching realized after assembly)

Preload specification: Measured load, Grade A

Tolerance class: HCP4A precision grade

Material: bearing composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on site

Indicative carbon footprint for new product: 0.4 kg CO₂e

Net weight: 0.107 kg

eClass code: 23-05-08-03

UNSPSC code: 311715

Speed note: The 18° contact angle provides higher axial capacity than 15° variants; high-speed E raceway reduces rolling friction. Single bearing can only sustain unidirectional axial load and must be installed in pairs or multi-bearing sets. Factory Grade A load measurement facilitates accurate preload control during matched assembly. Open construction requires external dust protection.

2 Structure & Operating Characteristics

Japan NMT 7006 FEGA/HCP4A is a single-row composite precision angular contact ball bearing in 7006 size with 18° high-speed E geometry. Integrated composite rings and optimized E contour for raceways and rolling elements balance high-speed performance and axial load capacity.

Open non-sealed design eliminates seal drag, compatible with high-speed grease and oil-air lubrication systems. No lubricant pre-filled; lubricant filling is carried out during assembly.

Composite matrix features lower self-weight and good vibration damping. Single-row structure supports radial load plus unidirectional axial load only, incapable of resisting bidirectional thrust or overturning moment independently. Each bearing is measured and recorded to Grade A standard at factory, supporting DB, DF, DT matched sets with precision spacers for stable preload adjustment.

3 Core Performance Advantages

1. 18° contact angle + high-speed E geometry: Improved axial load capacity while retaining superior high-speed capability.

2. HCP4A ultra-precision class: Strict control on rotary runout to meet high-end spindle accuracy requirements.

3. Composite bearing material: Lightweight, excellent vibration damping to suppress resonance at high rotation speed.

4. Multiple matching options: Compatible with back-to-back, face-to-face and tandem configurations for flexible application.

5. Factory Grade A measured load calibration: Traceable data reduces preload tuning difficulty for matched assemblies.

6. Open seal-free structure, suitable for all types of high-speed centralized lubrication systems.

4 Typical Application Scenarios

4.1 High-end mould machining & high-speed engraving-milling precision spindles: Processing equipment requiring both axial cutting force resistance and ultra-high rotational speed.

4.2 Precision tool grinders, small internal/external grinding spindles: Paired installation for high-precision grinding rotary support.

4.3 Semiconductor and inspection equipment high-speed precision rotary modules: Precision rotary mechanisms with lightweight and low-vibration requirements.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

HCP4A high-precision bearings must be assembled in dust-free clean workshops. Remove all burrs and metal debris on shaft and housing mating surfaces. Controlled thermal mounting is recommended; direct impact on bearing rings and raceways is prohibited. Single bearing cannot withstand bidirectional axial force; select corresponding matching layout according to load conditions.

5.2 Matching & Preload Instructions

Available matching layouts:

Back-to-back (<> DB): strong resistance to overturning moment, ideal for radial offset load;

Face-to-face (>< DF): better alignment tolerance during installation;

Tandem (>> DT): capable of carrying larger unidirectional axial thrust.

No built-in preload on single bearing. Preload is set via precision spacers combined with factory Grade A measured load data.

5.3 Lubrication Matching Solutions

No pre-filled lubricant. Oil-air lubrication is preferred for continuous long-term high-speed running; dedicated high-speed grease can be adopted for intermittent operation. Do not mix lubricants of different brands or types. Regularly inspect lubrication pipelines.

5.4 Speed Parameter Note

Obtain reference limiting speed data from SKF. Reserve adequate safety margin according to operating load; reduce working speed as load increases.

6 Daily Maintenance & Fault Troubleshooting

Carry out multi-stage low-speed progressive running-in after assembly. Raise speed to rated value only after temperature rise and vibration stabilize. Open bearing has no dust resistance; equipment must be equipped with external labyrinth or contact dust seals.

Maintain continuous and stable lubricant supply to avoid dry friction damage on contact surfaces. In case of abnormal temperature rise, increased vibration or noise, sequentially check lubrication supply, mounting coaxiality, axial preload and whether actual load exceeds applicable range.