1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7003 FE/HCP4ADGA

Model Code Explanation

7003: Base specification of 70 series precision angular contact bearing; FE: 18° contact angle, E-type high-speed two-point contact raceway geometry; HCP4A: composite material, P4A ultra-precision tolerance grade; DGA: Universal Duplex General Assembly, factory matched duplex set, supporting flexible conversion of multiple layouts. Two bearings are precisely selected at factory and cannot be mixed with other single bearings.

Standard Dimension Parameters

Bore d: 17 mm

Outer diameter D: 35 mm

Width B: 20 mm

Contact angle: 18 °

Load Performance Data

Basic dynamic load rating Cr: 9.36 kN

Basic static load rating C0r: 5.1 kN

Speed note: Contact SKF to obtain technical data of achievable operating speed

Full Product Attributes

Contact style: standard two-point contact

Row: 2 rows (duplex matched unit)

Race structure: integrated inner ring, integrated outer ring

Internal design: E-type high-speed optimized design

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

Matching arrangement: universal matching

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: 0.24 kg CO₂e

Net weight: 0.064 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

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

2 Structure & Operating Characteristics

Japan NMT 7003 FE/HCP4ADGA is an 18° E-type high-speed universal duplex precision angular contact bearing. It is end-face calibrated at factory and supports three assembly layouts without extra grinding. The 18° medium contact angle balances radial and axial load capacity, reconciling high-speed performance and axial rigidity. Optimized E-type high-speed raceway improves rolling contact geometry and reduces friction heat at high speed, suitable for long-term continuous high-speed operation. Integrated inner and outer rings maintain stable rigidity, minimize assembly deformation and sustain long-term high-precision rotation.

Back-to-back (<>): wide support span, excellent anti-overturning capacity, for spindles with bidirectional axial load and bending moment;

Face-to-face (><): higher tolerance for assembly coaxial error, fit for compact axial space and moderate overturning load;

Tandem (>>): superimposed unidirectional axial load capacity, for continuous single-direction axial thrust.

The bearing set is supplied with factory ultra-light preload, which lowers frictional temperature rise under high speed and mitigates precision deviation caused by thermal elongation, ideal for light-load high-speed equipment. Open seal-free design eliminates sealing friction to maximize speed potential. No pre-filled lubricant inside; high-speed grease or oil-air lubrication can be selected according to working conditions.

The matched set must not be split and mixed with other single bearings. Mismatch will damage original matching accuracy, resulting in higher vibration, noise and shortened service life.

3 Core Performance Advantages

1. Factory Universal Pre-Matched Duplex Set: One set compatible with three assembly layouts, adapting to various shaft load conditions and reducing spare part varieties.

2. 18° Contact Angle & E-Type High-Speed Raceway: Balanced radial and axial load capacity, controllable temperature rise at high speed, harmonizing load capacity and limiting speed.

3. Standard Ultra-Light Factory Preload: Low heat generation under high-speed operation, suppress thermal deformation, suitable for long-term continuous light-load high-speed operation.

4. Composite Bearing Material: Lighter weight reduces rotational inertia, featuring prominent lightweight merit and low carbon footprint.

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

6. Integrated Ring Structure: Superior structural stability to resist deformation from assembly stress for long-running precision spindles.

7. Open Seal-Free Construction: Free of extra friction loss to achieve outstanding limiting speed, compatible with advanced lubrication such as oil-air lubrication.

4 Typical Application Scenarios

4.1 Multi-Condition High-Speed Precision Spindles: Small machining center spindles, high-speed engraving spindles, switchable-load precision grinding spindles.

4.2 Flexible Automated Rotary Mechanisms: Precision indexing turntables with variable load direction, lightweight robot joints, multi-purpose high-speed winding shafts.

4.3 Lightweight Optical & Inspection Equipment: Rotary units of optical inspection platforms, high-speed lightweight material test equipment, precision fine-tuning rotary tooling.

4.4 Multi-Function Medium & Small Precision Equipment: General high-speed textile spindles, rotary support assemblies of miniature precision fluid machinery.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision universal duplex matched bearings must be installed 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 complete matched set; avoid mixing split bearings with other batches. Control interference fit properly: excessive interference leads to sharp temperature rise; insufficient interference causes outer ring creep and destroys preload status.

5.2 Matching Structure & Preload Instructions

This universal duplex bearing can be arranged as back-to-back (<>), face-to-face (><) or tandem (>>) according to load requirement. Confirm shaft load direction and bending moment before assembly to select optimal layout. Ultra-light preload is preset at factory. Assemble strictly following original matched end faces; do not add extra spacers to arbitrarily adjust preload magnitude. Contact manufacturer for customization if different preload level is required.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. High-speed low-viscosity grease is applicable for intermittent low-speed operation; oil-air circulating lubrication system is recommended for long-term continuous high-speed operation. Mixing different grades of lubricants 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 heavy load or poor heat dissipation to prevent premature fatigue failure.

6 Daily Maintenance & Fault Troubleshooting

Carry out low-speed no-load trial run after assembly, increase speed gradually, monitor vibration, noise and temperature rise. Formal operation can start only under stable working condition. Open design lacks built-in dust and coolant protection. External sealing must be installed at shaft end when dust, cutting fluid or moisture exists.

Replenish and replace lubricants periodically according to service cycle to maintain complete oil film on raceways. If continuous abnormal noise, precision decline or overheating occurs, sequentially inspect assembly interference, bearing layout, mounting direction, foreign particle intrusion and lubrication failure. Avoid severe impact loads which cause permanent ring deformation.