The MSK has 4 rows with 2 point arc profie. This allows an excellent smooth run with minimal moving forces.
The arc profile results in a very high load capability similar to the MSR type. The yaw moment is slightly lower.
The MSK is used when excellent smooth run and high loads are required.
More options :
/SQ Special quality
/HA Height matched ±0.01 mm
/OF Without lubrication
/KS Anti-cage creep