Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Boundary lubricated bearing
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing
Zero film bearing

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Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²

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