Balls

STANDARDWERKSTOFF

  • Material

Rolling bearing steel (chromium steel) 100Cr6, material no. 1.3505, SAE 52100, SUJ2

Special steels available upon request

  • Permissible operating temperature

Heat-stabilized up to a continuous operating temperature of 150°C (briefly up to 180°C)

  • Hardness

60 to 64 HRC, through-hardened; corresponds to 700–800 HV30 Properties

High purity and homogeneity, vacuum degassed

KL_AB_KG_Stahl_1
KL_AB_KG_Stahl_2

SPECIAL MATERIAL (HYBRID BALL BEARING)

Hybrid ball bearings are characterized by a combination of rolling-element steel (inner and outer rings) and ceramic (balls). The material properties of ceramic balls result in significant performance improvements in machine operation—particularly under critical conditions—compared to ball bearings with steel balls.

  • Material

  Ceramic (silicon nitride, Si3N4)

  • Material Properties

Low affinity for 100Cr6

Low coefficient of friction

Low thermal conductivity

Corrosion resistance

Non-magnetic

Electrically insulating

KL_AB_KG_Keramik_1
KL_AB_KG_Keramik_2
Longer service life

Due to their unique material properties, hybrid bearings last more than twice as long as steel bearings. Machine uptime is significantly increased.

KL_AB_KG_Diagram_3

Comparison of Material Properties

Higher Rotational Speeds

Thanks to their tribological properties and lower inertial forces, rotational speeds can be increased by up to 30% compared to bearings with steel balls.

 

Lower-cost lubrication

The maximum speed for grease and oil lubrication is increased. As a result, grease lubrication can often be used instead of more expensive oil lubrication.

KL_AB_KG_Diagram_1

Milling/rolling ratio

Higher Machining Accuracy

Greater bearing stiffness, reduced thermal expansion, and lower vibration excitation enable maximum machining accuracy.

 

Higher Stiffness

Their material properties improve radial and axial stiffness. The benefits include increased accuracy and a shift in critical natural frequencies.

KL_AB_KG_Diagram_2

Radial stiffness

Examples of use
  • Machine tool spindles
  • High-speed machine bearings
  • Precision bearings optimized for service life
KL_AB_KG_Diagram_4

Properties of Ceramic (Silicon Nitride) Si3N4 and Bearing Steel (Chromium Steel) 100Cr6