1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 CDGC/P4A

Model Code Explanation

7005: Base specification 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 style: standard two-point contact

Row: 1 row (single independent unit)

Race structure: integrated inner ring and outer ring

Internal design: D-type high-load optimized design

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

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

Preload / clearance specification: measured load, Class C

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: 0.29 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 mode, 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 bearing with integrated bearing steel inner and outer rings. The 15° small contact angle delivers excellent high-speed capability. Optimized D-type high-load raceway enlarges contact area to raise load rating, balancing high rotational speed and load capacity. Supplied as single unit. Bearings from the same batch are dimensionally screened, enabling customers to pair two units on site freely into DB, DF or DT layout.

This bearing adopts Class C measured preload with stable and consistent preload force, convenient for commissioning according to shaft rigidity and load conditions. 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.

When used in duplex arrangement, bearings from the same batch are preferred. Mixing different batches may damage matching accuracy, causing vibration rise and loss of rotational precision.

3 Core Performance Advantages

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

2. GC General Combination Specification for Flexible Layout: Supplied as single unit, customers can configure back-to-back, face-to-face or tandem arrangement on site to fit various spindle designs.

3. Class C Measured Load Preload: Excellent consistency of preload magnitude, easy for assembly and commissioning, suitable for shafts with different rigidity requirements.

4. High-Purity Bearing Steel: High hardness, superior wear resistance, long 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.

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 drilling spindles, precision grinding spindles, high-speed woodworking spindles.

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

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 rotary components for 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 raceways, rolling elements and working surfaces is prohibited. Use bearings from identical batch for duplex matching. 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 single universal match bearing without factory fixed arrangement; DB, DF and DT layouts can be configured on site freely. It complies with Class C measured load standard with moderate preload. Contact manufacturer for customization if alternative preload grade is required. Calculate axial load and overturning moment before assembly to select optimal matching layout.

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 mounting orientation, matching precision, foreign matter intrusion and lubrication failure. Avoid severe impact loads to prevent permanent deformation of bearing rings.