1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 CEGA/HCP4A

Model Code Explanation

7005: Basic dimension of 70 series precision angular contact ball bearing;

CEGA: 15° contact angle, high-speed E geometry, single matchable bearing, Class A measuring load;

HCP4A: Composite material, P4A ultra-precision tolerance grade.

Standard Dimension Parameters

Bore d: 25 mm

Outer diameter D: 47 mm

Width B: 12 mm

Contact angle: 15 °

Performance Data

Basic dynamic load rating Cr: 8.32 kN

Basic static load rating C0r: 4.15 kN

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

Full Product Attributes

Contact form: standard two-point contact

Number of bearings: 1 (single unit)

Ring structure: integrated inner ring and outer ring

Internal design: high-speed E-type optimized design

Matchable configuration: available for back-to-back (<>), face-to-face (><), tandem (>>) layout

Factory duplex set: none (single unit, matched on site)

Preload standard: measured load, Class A

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on site

Indicative carbon footprint for new product: 0.25 kg CO₂e

Net weight: 0.068 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Speed note: The 15° small contact angle targets high-speed applications. E-type internal structure reduces frictional resistance, and lightweight composite material minimizes rotational inertia. Supplied as single loose bearing without factory preload; axial preload shall be adjusted via precision spacers during assembly.

2 Structure & Operating Characteristics

Japan NMT 7005 CEGA/HCP4A is a 15° high-speed E-type single precision angular contact ball bearing with integrated composite rings. The E-type design optimizes the fit between cage and rolling elements to reduce frictional heat at high speed and maximize limiting rotational speed.

Supplied as single loose bearing without factory preset preload and fixed matched sets. Users can assemble two or more bearings into DB, DF or tandem layout according to spindle design. Class A measuring load controls narrow dimensional tolerance band, supporting accurate preload calculation during assembly. Open construction adapts to oil-air lubrication and low-viscosity high-speed grease; no lubricant pre-filled inside bearing.

Composite material achieves remarkable weight reduction versus bearing steel, lowering centrifugal force at high speed and improving start-stop response. The 15° contact angle is optimized for high-speed light-load operation with moderate axial load capacity. Without factory preload, high precision for spacer machining and assembly process is required. Suitable for high-end precision equipment where on-site precise preload adjustment is available. Mixing with bearings of different series or precision grades is prohibited.

3 Core Performance Advantages

1. High-Speed E Geometry + 15° Contact Angle: Optimized internal friction structure cuts temperature rise at high speed and fully unlocks limiting speed.

2. Lightweight Composite Matrix: Reduces rotational inertia, alleviates centrifugal load at high speed and enhances dynamic response.

3. Flexible Single Unit Matching: Supports multiple assembly layouts including DB, DF and DT to fit various compact spindle configurations.

4. Class A Measuring Load & P4A Precision: Excellent dimensional consistency and strict control of rotary runout for long-term precision operation.

5. Open Seal-Free Construction: Eliminates seal friction loss, delivers outstanding ventilation and heat dissipation, fully compatible with oil-air lubrication.

4 Typical Application Scenarios

4.1 Micro High-Speed Precision Motor Spindles: Small PCB drilling spindles, miniature engraving spindles, dental grinding spindles.

4.2 Rotary Shafts for Precision Optical & Inspection Equipment: Rotary shafts of video measuring machines, high-speed support units for optical encoders.

4.3 Precision Shafts for Compact Automation: Miniature ball screw supports, small collaborative robot joints, precision adjustment rotary tables.

4.4 Small Laboratory High-Speed Test Equipment: Supports for precision compact test benches and high-speed rotary inspection tooling.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings must be assembled in dust-free clean conditions. Thoroughly remove burrs and dust from shaft journals, housings and spacers. Controlled thermal mounting is recommended; striking bearing raceways and end faces is forbidden. Prioritize bearings from the same production batch for duplex or multiplex arrangement. Cross-series and cross-precision mixing is not allowed. Spacer thickness requires precision machining to accurately set axial preload.

5.2 Matching Layout & Preload Instructions

No factory preload. Axial preload is adjusted by spacers and lock nuts. Apply light preload for high-speed light-load working conditions; moderately increase preload under continuous alternating loads. Ultra-light, medium and heavy preload modes are available on demand.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. Oil-air lubrication is preferred for continuous non-stop high-speed operation; high-grade low-viscosity high-speed grease can be adopted for intermittent operation. Never mix different lubricant types. Clean lubrication pipelines regularly to prevent impurities entering raceways.

5.4 Speed Parameter Note

Obtain reference limiting speed data from SKF. Composite bearings feature good heat dissipation at high speed, but avoid long-term continuous shock loading to prevent surface layer damage.

6 Daily Maintenance & Fault Troubleshooting

Implement multi-stage low-speed running-in after assembly, continuously monitor temperature and vibration. High-speed operation can only start after stable operating status is confirmed. Open design provides no protection against dust and cutting fluid. External shaft seals must be installed in dusty or liquid exposure environments.

Maintain steady oil supply to form complete lubricating film on raceways. In case of abnormal temperature rise, continuous vibration growth or periodic abnormal noise, sequentially check spacer precision, preload value, bearing mounting direction, coaxiality, lubrication status and contamination ingress. Minimize frequent severe shock loads.