1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 CE/HCP4A

Model Code Explanation

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

CE: 15° contact angle, E-type high-speed optimized raceway geometry;

HC: Composite rolling element configuration;

P4A: 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

Permissible speed, grease lubrication: 56,000 r/min

Permissible speed, oil-air lubrication: 85,000 r/min

Full Product Attributes

Contact form: standard two-point contact

Number of rows: 1 row (single independent unit)

Ring structure: integrated inner ring and outer ring

Internal design: E-type high-speed optimized design

Universal matching bearing: not supported, duplex arrangement forbidden

Matching arrangement: none

Preload / clearance: not applicable

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: 0.25 kg CO₂e

Net weight: 0.068 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Speed note: Listed speeds are reference values under ideal conditions. Actual operating speed is affected by lubrication, heat dissipation, load and assembly coaxiality; sufficient safety margin shall be reserved during selection.

2 Structure & Operating Characteristics

Japan NMT 7005 CE/HCP4A is a 15° E-type high-speed precision angular contact ball bearing with integrated rings and E-type lightweight high-speed raceway, equipped with composite rolling elements. Lighter rolling elements reduce centrifugal force under ultra-high speed. The 15° contact angle balances axial load capacity and high-speed performance. E-type raceway contour optimizes rolling friction and suppresses temperature rise at high rotational speed.

Designed for single-unit application without factory dimensional screening for duplex matching; pairwise assembly without factory sorting is not recommended. Open non-sealed construction eliminates seal friction to reach maximum limiting speed. No pre-filled grease inside; select high-speed grease or oil-air lubrication according to working speed. Composite rolling elements feature low inertia, excellent vibration damping and high-speed resistance, while dynamic and static load ratings are lower than steel variants, suitable for light-load ultra-high-speed applications.

3 Core Performance Advantages

1. E-Type High-Speed Raceway + 15° Contact Angle: Low friction loss, excellent temperature control and outstanding limiting speed performance.

2. Composite Rolling Elements: Low mass reduces centrifugal load at high speed, suppresses vibration and raises maximum rotational speed.

3. Clear Dual Speed Ratings: Separate speed data for grease and oil-air lubrication, convenient for spindle lubrication system design.

4. P4A Ultra-Precision Grade: Strict control over radial and axial runout to sustain high precision under continuous high-speed operation.

5. Integrated Ring Structure: Stable rigidity and strong deformation resistance under high-speed conditions.

6. Open Seal-Free Structure: No friction loss from sealing components, fully unlocking high-speed performance and compatible with premium oil-air lubrication.

7. Lightweight Construction: Low overall weight, suitable for compact lightweight high-speed spindle layout.

4 Typical Application Scenarios

4.1 Small Ultra-High-Speed Precision Machining Spindles: High-speed PCB micro-drilling spindles, compact high-speed engraving & milling spindles, precision grinding high-speed motor spindles.

4.2 High-Speed Rotary Equipment for Laboratory & Inspection: High-speed optical scanning rotary tables, high-speed rotary units of precision testing instruments.

4.3 Lightweight High-Speed Automation Mechanisms: Compact high-speed winding machines, miniature high-speed rotary actuators.

4.4 High-Speed Rotary Components for Medical & Precision Instruments: Miniature high-speed medical motors, high-speed shafts of advanced analytical instruments.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision E-type high-speed bearings must be assembled in dust-free, constant-temperature clean environment. Remove all burrs, dust and fine debris on shaft journals and housing surfaces. Thermal mounting is preferred; avoid overheating and direct impact on raceways and rolling elements. This model shall not be freely used in duplex pairs. Properly control interference fit; excessive interference will cause excessive temperature rise at high speed.

5.2 Matching & Preload Instructions

This bearing is designed for single-unit use without factory duplex sorting. DB/DF/DT duplex configuration is not applicable. Contact manufacturer for customized matched sets if paired installation is required.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. High-quality high-speed grease is available for speed ≤56,000 r/min; oil-air lubrication system is mandatory above 56,000 r/min. Do not mix different lubricant grades. Maintain lubrication pipeline regularly to prevent foreign matter ingress.

5.4 Speed Parameter Note

Stated speeds are permissible values under standard ideal conditions. Reduce continuous operating speed by 10%～15% for long-term continuous operation to lower thermal failure risk; further reduce speed when load increases.

6 Daily Maintenance & Fault Troubleshooting

Perform gradual low-speed running-in after assembly, continuously monitor vibration, noise and temperature; full-load operation can start only under stable conditions. Open design offers no dust protection; effective external sealing against dust and oil mist contamination must be implemented for high-speed operation.

Regularly inspect lubricant supply to maintain stable oil film on raceways. If abnormal temperature rise, growing vibration or noise occurs, sequentially check interference fit, coaxiality, lubrication supply and foreign particle contamination. Avoid shock loads which may damage composite rolling elements.