High Precision Ball Bearings - Kraftmek

Seals
For long maintenance-free operation, deep groove
bearings and spindle bearings are charged with lubricant
ready for operation (for-life lubrication) and shielded/
sealed.
Spindle bearings are fitted with non contact "RZ” seals
and deep groove bearings are fitted with "Z” metal shields
(fixed in the outer ring by means of snap rings).
Advantages
• Simple design possible
• Protection against foreign particles
• Protection against the escape of lubricant
Materials
Ball bearing - Rings
• Standard:
Vacuum degassed chrome steel 100 Cr 6
(is equivalent to material no. 1.305, 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 loading 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 100 Cr 6
(is equivalent to material no. 1.305, SAE 52100, SUJ2)
• Ceramic material silicon nitride Si 3 N 4
• For higher temperatures up to 500 °C:
High temperature steel (on request)
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