Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thick film of lubricant between the journal and the bearing

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 mm outside diameter and 2 mm pitch
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads with cross-section of 33 mm

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