1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 ACEGB/P4A

Model Code Explanation

7005: Base specification of 70 series thin-section precision angular contact ball bearing;

ACE: 25° contact angle, E-type high-speed two-point contact raceway geometry;

GB: Single bearing, preload grade B classified by measured load;

P4A: bearing steel material, P4A ultra-precision tolerance grade.

Standard Dimension Parameters

Bore d: 25 mm

Outer diameter D: 47 mm

Width B: 12 mm

Contact angle: 25 °

Load Performance Data

Basic dynamic load rating Cr: 7.93 kN

Basic static load rating C0r: 3.9 kN

Speed note: Contact SKF to obtain official technical documents for achievable operating speed

Full Product Attributes

Contact style: standard two-point contact

Row: 1 row (single independent unit)

Race structure: integrated inner ring and outer ring

Internal design: E-type high-speed optimized design

Interchangeable matched configuration: available, back-to-back (<>), face-to-face (><), tandem (>>)

Matching arrangement: none (single unit, matched on site)

Preload / clearance specification: measured load, grade B

Tolerance class: P4A precision grade

Material: bearing steel

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on demand

Indicative carbon footprint for new product: 0.28 kg CO₂e

Net weight: 0.075 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

Speed note: Actual operating speed is affected by lubrication mode, heat dissipation, continuous load and assembly coaxiality. Confirm reference limiting speed with SKF before formal selection.

2 Structure & Operating Characteristics

Japan NMT 7005 ACEGB/P4A is a 25° E-type high-speed single precision angular contact bearing adopting integrated bearing steel inner and outer rings. The 25° contact angle balances axial load capacity and high-speed performance. Optimized E-type high-speed raceway improves rolling contact profile, reduces friction disturbance and suppresses temperature rise and vibration at high speed. Supplied as separate single units without factory pairing. Customers can select multiple bearings freely and assemble into back-to-back, face-to-face or tandem layouts according to shaft load requirements.

Preload grade B is classified based on standard measured load, offering moderate preload stiffness suitable for applications requiring both rotational speed and rigidity. Open non-sealed design eliminates friction loss from seals to maximize limiting speed. No pre-filled lubricant inside; high-speed grease or oil-air lubrication system is recommended.

Since no factory matching is carried out, use bearings from the same batch for multi-bearing sets to minimize vibration caused by individual precision deviation.

3 Core Performance Advantages

1. E-Type High-Speed Raceway & 25° Contact Angle: Balanced load capacity and high-speed capability, stable temperature control under continuous high-speed operation.

2. Single Unit Supply: Flexible assembly for duplex or triplet configurations, adaptable to various shaft designs and convenient stock management.

3. Grade B Preload with Measured Load: Moderate rigidity, well balanced precision and heat generation with wide versatility.

4. Bearing Steel Body: High mechanical strength, good wear resistance and reliable dimensional stability during long-term operation.

5. P4A Ultra-Precision Grade: Strict control over radial and axial runout to ensure long-term high-precision rotation.

6. Integrated Thin-Wall Ring Structure: Light weight and compact size, ideal for precision equipment with limited installation space.

7. Open Seal-Free Construction: No extra friction resistance, higher limiting speed, compatible with advanced oil-air lubrication solutions.

4 Typical Application Scenarios

4.1 Medium & Small High-Speed Precision Machine Tool Spindles: PCB drilling spindles, small engraving & milling spindles, high-speed grinding spindles, precision woodworking spindles.

4.2 High-Speed Rotary Mechanisms for Automation Equipment: High-speed precision indexing units, lightweight robot joints, rotary units for high-speed winding and conveying.

4.3 Optical & Precision Testing Equipment: Optical scanning rotary platforms, rotary supports for precision test fixtures, rotary shaft assemblies for small high-speed fluid equipment.

4.4 Small Precision General Equipment: High-speed textile rotary shafts, high-speed rotary components for compact precision medical devices.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision single angular contact bearings must be assembled in dust-free clean environment. Remove burrs, dust and metal debris on shaft journals, housing bores and spacer mating surfaces. Thermal mounting is preferred. Direct impact on raceways, rolling elements and working surfaces is prohibited. Select bearings from identical batches for multi-bearing matching. Control interference fit properly: excessive interference causes sharp temperature rise; insufficient interference leads to outer ring creep and unstable preload.

5.2 Matching Structure & Preload Instructions

This model is single unit bearing without factory pairing. Back-to-back (<>), face-to-face (><) or tandem (>>) layouts can be arranged freely based on load conditions. Calculate axial force and overturning moment of shaft system before assembly to confirm optimal configuration. Preload grade B (classified by measured load) suits applications balancing speed and support rigidity. Contact manufacturer for customization if alternative preload grade is required.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. High-speed low-viscosity grease applies to intermittent low-speed operation; oil-air circulating lubrication system is recommended for long continuous high-speed operation. Mixing different lubricant types is forbidden. Fully clean bearing assembly before lubricant replacement.

5.4 Speed Parameter Note

Obtain reference limiting speed data directly from SKF. Reserve sufficient safety margin for continuous operation. Reduce operating speed under heavy load or poor heat dissipation to prevent premature bearing fatigue failure.

6 Daily Maintenance & Fault Troubleshooting

Carry out low-speed no-load trial run after assembly, increase speed gradually and monitor vibration, noise and temperature rise. Formal operation can be started only under stable working status. Open design lacks built-in dust and coolant protection. External sealing must be installed at shaft end if dust, cutting fluid or moisture exists in working environment.

Replenish and replace lubricants periodically according to service cycle to maintain complete oil film on raceways. If continuous abnormal noise, accuracy decline or overheating occurs, sequentially check assembly interference, bearing layout, mounting orientation, foreign matter intrusion and lubrication failure. Avoid severe impact loads to prevent permanent deformation of bearing rings.