1 Complete Model, Dimensions, Loads & Technical Parameters

Full Model: 7005 FE/HCP4ADT

Model Code Explanation

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

FE: 18° contact angle, high-speed E geometry;

HCP4A: Composite material, P4A ultra-precision tolerance grade;

DT: Factory pre-matched tandem duplex arrangement.

Standard Dimension Parameters

Bore d: 25 mm

Outer diameter D: 47 mm

Width B: 24 mm

Contact angle: 18 °

Performance Data

Basic dynamic load rating Cr: 13.3 kN

Basic static load rating C0r: 8.15 kN

Speed note: Contact SKF to obtain reference achievable rotational speed.

Full Product Attributes

Contact form: standard two-point contact

Number of bearings: 2 (duplex assembled set)

Ring structure: integrated inner ring and outer ring

Internal design: high-speed E-type optimized design

On-site matching available: No (fixed factory DT set, disassembly & free re-matching forbidden)

Duplex arrangement: tandem << (DT)

Quantity of bearings in set: 2

Preload specification: Not applicable (factory fixed arrangement)

Tolerance class: P4A precision grade

Material: composite material

Coating: uncoated

Seal: open type without seals

Pre-filled lubricant: none, lubrication configured on site

Indicative carbon footprint for new product: 0.49 kg CO₂e

Net weight: 0.132 kg

eClass code: 23-05-08-03

UNSPSC code: 31171531

Speed note: The 18° contact angle balances high-speed performance and axial load capacity. DT tandem set greatly improves unidirectional axial load capacity. Lightweight composite material reduces rotational inertia. Supplied as factory pre-matched assembly; disassembly for single bearing use or rearrangement into DB/DF layout is prohibited.

2 Structure & Operating Characteristics

Japan NMT 7005 FE/HCP4ADT is a factory preassembled duplex precision angular contact ball bearing of 7005 size with 18° high-speed E-type design and integrated composite rings. E-type geometry optimizes cage-rolling element coordination to suppress frictional heat and balance limiting speed and load capacity.

Supplied as complete DT tandem matched set with two bearings arranged in same direction to jointly carry unidirectional axial force. Overall dimension, coaxiality and relative position are calibrated at factory. Disassembly for separate mounting or layout modification is not permitted. Open construction supports oil-air lubrication and low-viscosity high-speed grease; no lubricant pre-filled inside bearing.

Composite material delivers obvious weight reduction versus bearing steel, lowering centrifugal effect at high speed and improving dynamic response. The 18° contact angle sits between pure high-speed type and heavy-load type, suitable for applications combining high rotating speed and continuous unidirectional axial load. DT tandem structure is only recommended for dominant one-way axial force; avoid working conditions with heavy alternating bidirectional axial load.

3 Core Performance Advantages

1. High-Speed E Geometry + 18° Contact Angle: Balanced high-speed property and axial load capacity, reducing temperature rise at high rotation.

2. Factory Pre-Matched DT Tandem Assembly: No on-site matching work, easy installation and significantly enhanced unidirectional axial rigidity.

3. Lightweight Composite Matrix: Lower rotational inertia, fast high-speed start-stop response and reduced centrifugal load.

4. P4A Precision Grade: Strict rotary runout control to sustain long-term precision operation.

5. Open Seal-Free Construction: Eliminates seal friction loss, superior heat dissipation and full compatibility with oil-air lubrication.

4 Typical Application Scenarios

4.1 High-Speed Precision Motor Spindles with Unidirectional Axial Load: Compact high-speed grinding spindles, engraving spindles under continuous single-side thrust.

4.2 Miniature Precision Ball Screw Supports: Vertical small feed screws, unidirectionally preloaded screw support units.

4.3 Compact High-Speed Rotary Test Equipment: Supports for laboratory high-speed rotary tooling, small centrifugal test devices.

4.4 Precision Unidirectional Rotary Shafts for Automation: Miniature high-speed indexing mechanisms, unidirectional thrust precision rotary tables.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

P4A high-precision assembled bearing must be fitted in dust-free clean environment. Fully remove burrs and dust on shaft and housing mating surfaces. Controlled thermal mounting is recommended. Striking bearing faces and raceways is forbidden. Disassembling the integrated DT set for single bearing use, mixing with other bearings or converting to DB/DF layout are strictly prohibited. Ensure mounting coaxiality to prevent eccentric loading.

5.2 Matching Layout & Preload Instructions

DT tandem layout is fixed by factory and cannot be altered. Overall preload is applied via locking components during assembly. Suitable primarily for dominant unidirectional axial load. If large alternating bidirectional axial force exists in equipment, switch to DB back-to-back duplex bearings.

5.3 Lubrication Matching Solutions

No pre-filled lubricant inside bearing. Oil-air lubrication preferred for continuous long-term high-speed operation; high-grade low-viscosity high-speed grease for intermittent operation. Never mix different lubricant types. Maintain lubrication pipelines regularly to prevent contaminants entering raceways.

5.4 Speed Parameter Note

Request reference limiting speed data from SKF. Composite bearings feature good high-speed heat dissipation, but avoid long-term bidirectional shock loads which may cause uneven stress and surface layer damage.

6 Daily Maintenance & Fault Troubleshooting

Carry out staged low-speed running-in after assembly, continuously monitor temperature and vibration. Rated high-speed operation can start only after stable operating status is confirmed. Open structure provides no dust or cutting fluid protection; install external shaft seals when exposed to dust or liquid.

Supply lubricant steadily to form complete oil film on raceways. When abnormal temperature rise, increased vibration or noise occurs, sequentially verify mounting coaxiality, preload magnitude, lubrication status and contamination ingress. Minimize frequent reverse shock loads.