Machine Design
A shaft coupling should

Be easy to connect or disconnect
Transmit full power of the shaft
All of these
Hold the shafts in perfect alignment

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Machine Design
A bolt of M 24 × 2 means that

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
The nominal diameter of bolt is 24 mm and pitch is 2 mm

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals

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