||Basic Loading Ratings
||Permissible axial load
||Effective load center
||Limiting speeds (rpm)
For the main spindles of machine tools, good high speed performance and high rigidity are required for the ball bearings used in combination with double-row cylindrical roller bearings. For these applications, to allow selection appropriate for the characteristics of the machine, we provides three types of bearings.
All these bearings have special outer ring outside diameter tolerances (P4A Class and P2A Class) to provide clearance between the outer ring periphery and housing bore in order to avoid any load. our ROBUST series high-speed angular contact thrust ball bearings are capable of high-speed operations while maintaining high rigidity. Ball diameter and number of balls are the same as TAC type bearings. BTR type bearings have a 40° contact angle, and BAR type bearings have a 30° contact angle. The result is superior high-speed performance that minimizes heat generation.