1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7000 CDGB/P4A

Model Code Explanation

7000: Base specification of 70 series extra-small precision single row angular contact bearing; CD: D-type high-load raceway profile, two-point contact geometry; GB: single unit universal matching, Class B measured load; P4A: P4A ultra-precision tolerance grade. Supplied as single bearing unit; customers select and combine bearings on site according to shaft system design.

Standard Dimension Parameters

Bore d: 10 mm

Outer diameter D: 26 mm

Width B: 8 mm

Contact angle: 15 °

Load Performance Data

Basic dynamic load rating Cr: 4.1 kN

Basic static load rating C0r: 1.66 kN

Limit Speed Note

Consult SKF for technical reference data of achievable operating speeds.

Full Product Attributes

Contact style: standard two-point contact

Row: 1 row (single row construction)

Race structure: integrated inner ring, integrated outer ring

Internal design: D-type high-load optimized design

Universal matching capability: matchable for back-to-back (<>), face-to-face (><), tandem (>>) layouts

Factory pre-arrangement: none (supplied individually)

Preload / clearance specification: measured load, Class 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: 0.07 kg CO₂e

Net weight: 0.019 kg

eClass code: 23-05-08-04

UNSPSC code: 31171531

Speed note: Actual speed depends on lubrication, heat dissipation, continuous load and assembly coaxiality. Oil-air lubrication is recommended for high-speed applications. Refer to official SKF documents for detailed speed limits.

2 Structure & Operating Characteristics

Japan NMT 7000 CDGB/P4A is a single row precision angular contact bearing of 70 extra-small series. The 15° small contact angle prioritizes high-speed capability while delivering balanced radial load capacity. Integrated inner and outer rings ensure stable rigidity and minimize deformation under assembly force. Optimized D-type raceway profile improves dynamic load capacity and extends fatigue service life compared to standard designs.

Supplied as separate single unit with universal matching property. Customers can assemble two or more bearings into back-to-back, face-to-face or tandem configurations according to spindle load, span and overturning moment requirements. Class B measured load enables precise preload adjustment via spacers, ideal for precision spindles requiring accurate preload calibration.

Open seal-free construction eliminates friction from sealing elements, compatible with grease lubrication and oil-air lubrication. No pre-filled lubricant inside; manufacturers can select suitable lubricants based on operating temperature and target speed. Only 8 mm in width, the slim compact structure suits precision equipment with limited axial installation envelope.

3 Core Performance Advantages

1. Single Unit Universal Matching: Individually supplied, supporting three classic matching layouts to adapt to various spindle load structures.

2. Standard Class B Measured Load: Normalized load range allows accurate preload control by spacers with high consistency.

3. 15° Small Contact Angle: Low rolling loss and controllable temperature rise at high speed for superior high-speed performance.

4. D-Type High-Load Raceway Optimization: Improves contact stress distribution, enhancing dynamic load capacity and running smoothness.

5. P4A Ultra-Precision Grade: Strict control of radial and axial runout to maintain long-term high-precision rotation for optical equipment and miniature machining spindles.

6. Integrated Inner & Outer Rings: High structural strength resists assembly deformation and sustains precision over long service cycles.

7. Ultra-Slim Compact Outline: Width 8 mm saves axial installation space for miniaturized and lightweight equipment designs.

4 Typical Application Scenarios

4.1 Miniature High-Speed Precision Spindles: Micro-hole machining spindles, high-speed spindles for small engraving machines, built-in miniature rotary units for laboratory instruments.

4.2 Optical & Precision Inspection Equipment: Rotary mechanisms for optical lenses, rotary fixtures for visual inspection, auxiliary rotary shaft assemblies for CMM.

4.3 Small Automation Precision Mechanisms: Mini robot joints, small precision indexing turntables, miniature rotary assemblies for semiconductor transportation.

4.4 Small Precision Machinery & Medical Devices: Rotary shafts for micro CNC grinding equipment, high-speed shafts for precision textile machinery, rotary components for minimally invasive medical instruments.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision bearings must be mounted in dust-free clean conditions. Remove burrs, dust and metal debris on shaft journals, housing bores and spacer mating surfaces. Thermal mounting is preferred. Direct impact on raceways and working surfaces is prohibited. Control interference fit properly: excessive interference disturbs original load characteristics and causes overheating; insufficient interference leads to outer ring creep and abrasion. Bearings from the same batch are recommended for matched sets to guarantee matching accuracy.

5.2 Matching Layout & Class B Load Instructions

7000 CDGB/P4A is single unit Class B measured load bearing without factory preset arrangement. Characteristics of three assembly options:

Back-to-back <> : strong resistance to overturning moment, suitable for spindles with overhanging structure;

Face-to-face >< : excellent axial positioning accuracy, ideal for short-span precision positioning shaft systems;

Tandem >> : maximized unidirectional axial load capacity for continuous single-direction axial load.

Class B measured load is used for accurate preload tuning. Spacer thickness must be calculated properly. Do not grind spacers arbitrarily without engineering calculation to avoid excessive or insufficient preload.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. Oil-air circulating lubrication is preferred for maximum speed applications; low-viscosity grease for high-speed precision bearings can be adopted for regular continuous operation. Mixing different lubricants is forbidden. Thoroughly clean residual old lubricant before replacement.

5.4 Speed Parameter Note

Achievable limit speed refers to corresponding official SKF technical data. Actual operating speed is restricted by load, preload level, heat dissipation and lubrication. Maintain sufficient safety margin for speed under continuous full-load operation.

6 Daily Maintenance & Fault Troubleshooting

Conduct low-speed no-load trial run after assembly, increase speed gradually, continuously monitor vibration, noise and temperature rise. Formal operation can start only after stable status confirmed. Open construction has no built-in protection against dust and cutting fluid. External sealing must be installed at shaft end if contaminants or moisture exist.

Replenish and replace lubricants regularly according to maintenance schedule to sustain effective oil film on raceways. If continuous abnormal noise, precision drift or overheating occurs during operation, prioritize checking assembly interference, matching arrangement, foreign particle intrusion and lubrication failure. Avoid severe impact loads which may induce permanent deformation of integrated rings.