1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 CD/HCP4ADGA

Model Code Explanation

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

CD: 15° contact angle, D-type high-load raceway geometry;

HC: composite material for bearing components;

P4A: P4A ultra-precision tolerance grade;

DGA: Duplex General Arrangement, factory pre-matched duplex universal bearing set.

Standard Dimension Parameters

Bore d: 25 mm

Outer diameter D: 47 mm

Width B: 24 mm

Contact angle: 15 °

Load Performance Data

Basic dynamic load rating Cr: 15.6 kN

Basic static load rating C0r: 10.4 kN

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

Full Product Attributes

Contact style: standard two-point contact

Row: 2 rows (duplex matched unit)

Race structure: integrated inner ring and outer ring

Internal design: D-type high-load optimized design

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

Matching arrangement: universal match

Quantity of bearings in set: 2 units

Preload / clearance specification: ultra-light preload

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on demand

Indicative carbon footprint for new product: 0.51 kg CO₂e

Net weight: 0.137 kg

eClass code: 23-05-08-03

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 CD/HCP4ADGA is a 15° D-type high-load duplex universal matched precision angular contact bearing with integrated composite inner and outer rings. The 15° small contact angle adapts well to high-speed applications. Optimized D-type high-load raceway enlarges contact area to raise load rating, balancing high rotational speed and load capacity. Supplied as factory pre-matched duplex universal set. Two bearings are precisely screened and paired, supporting flexible conversion between back-to-back, face-to-face and tandem mounting layouts without on-site matching.

Ultra-light preload is preset at factory. Low preload reduces friction heat generation and maximizes limiting speed, ideal for high-speed shaft systems with medium load and strict temperature limits. Open non-sealed construction eliminates seal friction loss to deliver full high-speed performance. No pre-filled lubricant inside; high-speed grease or oil-air lubrication system is recommended.

Do not split the matched set and mix with other single bearings, otherwise pairing accuracy will be destroyed, resulting in increased vibration and rapid loss of rotational precision.

3 Core Performance Advantages

1. D-Type High-Load Raceway & 15° Contact Angle: Superior load capacity with excellent high-speed capability, satisfying both load and speed requirements.

2. Factory Pre-Matched Duplex Universal Set: Ready for direct installation, multiple layouts interchangeable, shortening assembly and commissioning time significantly.

3. Factory Ultra-Light Preload: Low friction and heat generation, outstanding limiting speed performance for spindles requiring strict temperature control.

4. Composite Material Construction: Lower weight and inertia, good corrosion resistance, suitable for various operating environments.

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

6. Integrated Ring Structure: Stable structural rigidity and strong deformation resistance for long continuous stable operation.

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

4 Typical Application Scenarios

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

4.2 Heavy-Duty High-Speed Rotary Mechanisms for Automation: Precision heavy-load indexing units, heavy-duty robot joints, high-speed winding equipment, heavy-load rotary conveying units.

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

4.4 High-End Small Precision Equipment: High-speed precision textile rotary shafts, high-speed rotary components for lightweight precision medical instruments.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision duplex universal matched 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. Use the matched set as a whole; avoid splitting and mixing with other bearings. Control interference fit properly: excessive interference causes sharp temperature rise; insufficient interference leads to outer ring creep and damages preset preload.

5.2 Matching Structure & Preload Instructions

This model is factory pre-matched duplex universal bearing set. Back-to-back (<>), face-to-face (><) or tandem (>>) layouts can be selected freely according to load conditions. Calculate axial force and overturning moment of shaft system before assembly to confirm optimal configuration. Ultra-light preload fits high-speed applications with medium load and tight temperature control. 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.