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The o-ring is compatible with Bosch motors from the Performance, Performance CX, Speed, and Cargo Line of the 4th generation. According to the manufacturer's specifications, the lock ring should always be installed together with the corresponding O-ring to protect the lock ring from loosening, even if the tightening torque is not applied exactly. The correct tightening torque is 25-30 Nm.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.