1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7001 ACD/P4ADFC

Model Code Explanation

7001: Base specification of 70 series precision angular contact bearing; ACD: 25° contact angle, D-type high-load two-point contact raceway profile; DFC: fixed face-to-face matched set with medium preload; P4A: P4A ultra-precision tolerance grade. Supplied as matched set of two bearings with factory fixed face-to-face (><) arrangement, layout cannot be modified on site.

Standard Dimension Parameters

Bore d: 12 mm

Outer diameter D: 28 mm

Width B: 16 mm

Contact angle: 25 °

Load Performance Data

Basic dynamic load rating Cr: 7.02 kN

Basic static load rating C0r: 3.65 kN

Limit Speed Note

Consult SKF for technical reference data of achievable operating speeds.

Full Product Attributes

Contact style: standard two-point contact

Row: 2-row matched set construction

Race structure: integrated inner ring, integrated outer ring

Internal design: D-type high-load optimized design

Universal matching bearing: not available (fixed pre-assembled set)

Factory matching arrangement: face-to-face (><)

Quantity of bearings in set: 2 units

Preload / clearance specification: medium preload

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: 0.16 kg CO₂e

Net weight: 0.042 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 7001 ACD/P4ADFC is a fixed matched double-row precision angular contact bearing of 70 series with 25° contact angle. The 25° large contact angle enhances axial load capacity to withstand combined radial and bidirectional axial loads. Integrated inner and outer rings provide high rigidity and minimize assembly deformation. Optimized D-type raceway improves contact stress distribution for higher dynamic load capacity and smoother operation.

This bearing is factory pre-assembled as face-to-face (><) matched set with preset medium preload; no on-site preload adjustment required. Face-to-face layout delivers superior axial positioning accuracy, ideal for short-span shafts requiring precise axial location. Medium preload balances rotational rigidity, vibration suppression and temperature rise, suitable for medium speed and combined load working conditions.

Open seal-free design eliminates friction caused by sealing elements, compatible with grease lubrication and high-speed oil-air lubrication. No pre-filled lubricant inside; equipment manufacturers can select suitable lubricants according to operating temperature and rotational speed. Overall width reaches 16 mm with compact outline to save assembly space.

3 Core Performance Advantages

1. Factory Pre-set Face-to-Face Matched Set: Two precisely matched bearings with preconfigured preload, simplifying on-site assembly.

2. Balanced Medium Preload: Optimized balance between rotational rigidity and heat generation, effective vibration suppression for most precision spindle applications.

3. 25° Contact Angle Geometry: Strong bidirectional axial load capacity for shafts bearing combined radial and dual-direction axial loads.

4. D-Type High-Load Raceway Optimization: Improves rolling element contact condition, raises load capacity and extends service life.

5. P4A Ultra-Precision Grade: Strict control over radial and axial runout to sustain long-term high-precision rotation for precision processing equipment and inspection instruments.

6. Integrated Inner & Outer Rings: High structural strength resists assembly deformation and maintains stable precision during long-term operation.

7. Integrated Set Supply: No separate bearing selection needed, reduces matching error and ensures consistent assembly quality.

4 Typical Application Scenarios

4.1 Small Precision Machining Spindles: Spindles for engraving & milling machines, micro-hole processing equipment, high-speed rotary units for small grinding machines.

4.2 Automated Precision Positioning Mechanisms: Precision indexing turntables, robot joint shafts, rotary support components for linear modules.

4.3 Optical & Inspection Instruments: Rotary mechanisms for image measuring equipment, rotary shafts for optical platforms, precision inspection fixtures.

4.4 Precision Medical & Textile Equipment: Rotary assemblies for precision medical devices, support spindles for high-speed precision textile machinery.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision matched set bearings must be mounted in dust-free clean surroundings. Remove burrs, dust and metal debris on shaft journals, housing bores and spacer surfaces. Thermal mounting is preferred. Direct impact on raceways and working surfaces is prohibited. Always use bearings as a complete set; splitting the set and mixing with bearings from other batches is forbidden, which will destroy factory matching accuracy and preset preload. Control interference fit properly: excessive interference leads to higher temperature rise, insufficient interference causes outer ring creep and abrasion.

5.2 Matching Layout & Medium Preload Instructions

7001 ACD/P4ADFC is factory fixed face-to-face (><) set. Do not split the set to convert into back-to-back or tandem arrangement arbitrarily. Advantages of face-to-face layout: excellent axial positioning accuracy and uniform stress distribution, suited for short-span precision positioning shaft systems.

Preset medium preload fits working conditions with moderate combined loads. Recheck bearing rating life and thermal status under long-term heavy axial load or continuous extreme high speed. Do not grind spacers to modify preload without mechanical calculation.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. Oil-air circulating lubrication is preferred for maximum speed applications; low-viscosity special 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 working condition 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, improper bearing splitting & mixing, foreign particle intrusion and lubrication failure. Avoid severe impact loads which may induce permanent deformation of integrated rings.