Description
SKF 7011ACEGA/HCP4AL — Hybrid Ceramic Super-Precision Spindle Bearing
Hybrid Ceramic Super-Precision Spindle Bearing from SKF’s super-precision range, for grinding, milling and high-speed machine-tool spindles where running accuracy is required. Universally matchable for paired or multi-bearing arrangements. Sold per bearing — order the quantity your arrangement requires.
Specifications
- Brand: SKF
- Designation: 7011ACEGA/HCP4AL
- Type: Hybrid Ceramic Super-Precision Spindle Bearing
- Bore (d): 55 mm
- Outside diameter (D): [confirm from datasheet] mm
- Width (B): [confirm from datasheet] mm
- Ball material: Silicon nitride (Si₃N₄) ceramic
- Contact angle: 25°
- Precision class: P4 (≈ ABEC 7)
- Preload: light, universal matching
- Sealing: Open (relubrication via spindle system)
Suffix breakdown — what you are actually buying
- Hybrid ceramic — Si₃N₄ ceramic balls in steel rings: ~40% lighter and harder than steel, cutting centrifugal load at high n·dm for higher speed, lower heat and longer life, and electrically insulating the bearing against VFD/motor bearing currents (fluting).
- 25° contact angle — higher axial stiffness than the 15° variant; suited to the fixed/locating spindle position and higher axial cutting loads.
- P4 — ISO precision class (≈ ABEC 7) with restricted running tolerances for low radial and axial runout and repeatable concentricity.
- light preload, universal matching — mounts in DB/DF/DT arrangements to the designed preload when clamped.
- Full designation — supplied and verified exactly as specified: 7011ACEGA/HCP4AL.
What this means on the spindle
- Higher speed, cooler running: lighter ceramic balls cut centrifugal load and heat, lifting the speed ceiling versus an equivalent steel bearing.
- Electrical insulation: ceramic balls block inverter-driven motor bearing currents, preventing fluting and premature failure.
- High rigidity: defined contact angle and preload hold the shaft against axial and radial cutting forces, protecting tolerance under load.
- Low runout: super-precision running accuracy keeps concentricity tight for surface finish and tool life.
- Long service life: precision raceways and controlled preload extend service intervals and reduce failures.
10+ Years FAG Bearing Specialist Support
Every order is checked by a specialist with over a decade in FAG precision bearings. Send us the full designation and we will verify every prefix and suffix — contact angle, cage, precision class, preload and sealing — so the part you receive is an exact match for your spindle, not an approximate substitute. FAG, INA (Schaeffler Group), SKF, NSK and IBC references are supplied as 100% genuine product, with documentation available on request and express cross-border shipping to the UK and EU.