1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 CDGC/P4A

Model Code Explanation

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

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

GC: General Combination, single unit for flexible duplex matching;

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 °

Load Performance Data

Basic dynamic load rating Cr: 9.56 kN

Basic static load rating C0r: 5.2 kN

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

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: D-type high-load optimized design

Universal matching bearing: available, combinable as back-to-back (<>), face-to-face (><), tandem (>>)

Matching arrangement: none (single unit, matching completed on site)

Preload / clearance: measured load, Class C

Tolerance class: P4A precision grade

Material: bearing steel

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication scheme configured on site

Indicative carbon footprint for new product: 0.29 kg CO₂e

Net weight: 0.077 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

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

2 Structure & Operating Characteristics

Japan NMT 7005 CDGC/P4A is a 15° D-type high-load single universal match precision angular contact ball bearing with integrated bearing steel inner and outer rings. The 15° contact angle balances high-speed performance and axial load capacity. Optimized D-type raceway improves rolling element contact condition and increases load rating to balance rotational speed and load capacity. Supplied as single unit. Bearings from the same batch are precisely dimensionally screened. Customers can pair two bearings according to equipment structure and freely adopt DB, DF or DT assembly configuration.

The bearing complies with Class C measured preload specification with low preload dispersion, easy for assembly and adjustment, suitable for spindle systems with different rigidity requirements. Open non-sealed design eliminates friction resistance of seals to maximize high-speed performance. No grease prefilled inside the bearing; high-speed grease or oil-air lubrication system is recommended.

Bearings from the same batch are preferred for duplex arrangement. Mixing different batches easily leads to unbalanced matching accuracy, increased vibration and reduced rotational precision.

3 Core Performance Advantages

1. D-Type High-Load Raceway & 15° Contact Angle: Excellent load capacity and stable high-speed operation, meeting both speed and load requirements.

2. GC Universal Matching Single Unit Design: Supplied separately. Back-to-back, face-to-face or tandem layout can be switched on site to adapt to various equipment structural designs.

3. Class C Measured Load Preload Standard: High consistency of preload magnitude, convenient for assembly and commissioning, applicable to rotary shafts with various rigidity requirements.

4. High-Purity Bearing Steel Substrate: High hardness, outstanding wear resistance, longer contact fatigue life 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 of equipment.

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

7. Open Seal-Free Structure: No friction loss caused by seals, higher limiting speed, fully compatible with advanced lubrication solutions such as oil-air lubrication.

4 Typical Application Scenarios

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

4.2 High-Speed Rotary Mechanisms for Automation: Precision indexing units, medium-small robot joints, rotary units of high-speed winding equipment.

4.3 Optical & Precision Testing Equipment: High-precision optical scanning rotary platforms, rotary support assemblies for precision test fixtures.

4.4 Small Precision General Equipment: High-speed precision textile rotary shafts, high-speed rotating parts of lightweight precision instruments.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision single universal match 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 bearing raceways, rolling elements and working surfaces is prohibited. Bearings from the same batch are recommended for duplex matching. Properly control interference fit: excessive interference leads to sharp temperature rise during operation; insufficient interference causes outer ring creep and wear and damages matched preload.

5.2 Matching Structure & Preload Instructions

This model is single universal match bearing without factory fixed arrangement. DB, DF and DT layouts can be freely assembled on site. It follows Class C measured load standard with moderate preload. Contact the manufacturer for customization if preload grade needs to be changed. Calculate axial load and overturning moment of the shaft before assembly to select the optimal matching scheme.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside the bearing. High-speed low-viscosity grease is suitable for intermittent low-speed operation; oil-air circulating lubrication system is recommended for long continuous high-speed operation. Mixing lubricants of different brands and models is forbidden. Thoroughly 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 increased load and poor heat dissipation to avoid premature fatigue failure of bearings.

6 Daily Maintenance & Fault Troubleshooting

Carry out low-speed no-load trial run after assembly, increase speed gradually, monitor vibration, noise and temperature rise continuously. Formal production can be started only under stable operating conditions. Open structure does not provide protection against dust and cutting fluid. If dust, cutting fluid or moisture exists in working environment, external seals must be installed at shaft ends.

Replenish and replace lubricants periodically according to operation cycle to maintain complete oil film on raceway surfaces. In case of continuous abnormal noise, reduced rotational accuracy or abnormal temperature rise during operation, sequentially check assembly interference, bearing mounting orientation, matching accuracy, foreign matter intrusion and lubrication failure. Avoid severe impact loads on bearings to prevent permanent deformation of rings.