Ball bearing rings:

• Standard:
  Vacuum degassed chrome steel 100Cr6 (is equivalent to material no. 1.3505, SAE 52100, SUJ2) Heat treated for operating temperatures up to 150°C
• HNS steel (High Nitrogen Steel):
  For applications which demand
  - higher speeds
  - higher resistance to wear
  - higher load capacity
  - higher resistance to heat
  - higher corrosion resistance
  (on request)
• For higher temperatures up to 500°C: 
  High temperature steel (on request)

Balls:

• Standard:
  Vacuum degassed chrome steel 100Cr6 (is equivalent to material no. 1.3505, SAE 52100, SUJ2)
• Ceramic material silicon nitride Si3N4
• For higher temperatures up to 500°C:
  High temperature steel (on request)