H Series Ultra-High-Speed Spindle Bearings

Ultra-high-speed bearings are designed for high-speed rotating applications under light-load conditions. They require high precision, high rotational speed capability, low temperature rise, low vibration, and long service life. These bearings are typically mounted in pairs as support components for high-speed motorized spindles and serve as critical components in the spindles of internal cylindrical grinding machines.

Inner Diameter: 25mm

Contact Angle: 15°

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Features

Performance Features of Ultra-High-Speed Bearings

✅ Optimized Internal Design:Ultra-high-speed bearings feature various cage designs and optimized ball configurations. Their basic structure typically includes a bearing ring with a single shoulder and a ramped raceway design on the opposite side.

✅ Advanced Cage Design:Solid or pressed cages eliminate the need for rivets, improving structural reliability and enabling stable operation at high speeds.

✅ Higher Speed Capability:Compared with deep groove ball bearings of the same dimensions, ultra-high-speed bearings offer higher limiting speeds.

✅ Combined Radial and Axial Load Capacity:These bearings can accommodate both radial and axial loads, with load capacity influenced by the contact angle.

✅ Paired Installation Design:Due to the axial force generated during operation, ultra-high-speed bearings are generally used in matched pairs.

✅ Matched Bearing Sets：Multiple bearing arrangements can increase axial load capacity in one direction and support axial loads in both directions.

✅ Preload Capability:Applying preload eliminates internal clearance, improving rotational accuracy, stiffness, and overall spindle performance.

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Product Details

Designation Example Precautions Sourcing Checklist

H Series Ultra High-Speed Spindle Bearings
Key Considerations When Selecting Ultra-High-Speed Bearings

1. Bearing Arrangement

A single ultra-high-speed bearing does not require preload adjustment or matching. When two or more bearings are used together, matched arrangements are required.

Common arrangements include:
- DB (Back-to-Back)
- DF (Face-to-Face)
- TBT / TFT (Triple Bearing Arrangements)
- Four-bearing or five-bearing arrangements for specific applications
2. Preload Selection

Preload is applied to improve spindle rigidity during high-speed operation while balancing bearing service life requirements.

Preload levels are generally classified into:
- Light preload
- Medium preload
- Heavy preload
During operation, the external load offsets part of the preload, reducing rolling element load while maintaining spindle rigidity and extending bearing service life.

3. Precision Grade

The maximum operating speed of ultra-high-speed bearings is affected by precision grade.

Typical applications:
- P2 or P4 precision bearings are commonly used for high-speed motorized spindles and precision machining centers.
- P4 or P5 precision bearings are generally used for conventional lathes, milling machines, and applications with different accuracy requirements.
Key Information Required for Bearing Selection

When selecting ultra-high-speed bearings, customers should confirm the following specifications:

1.Bearing Design
- H series or B series structure
- Open or sealed design
2.Contact Angle
- C contact angle
- AC contact angle
3.Bearing Arrangement
- Single bearing or matched bearing set
- Number of matched bearings
- Preload level requirement
4.Precision Grade
- P2
- P4A
- P4
- P5