Machine Design
A self locking screw has

Hole for inserting split pin
Fine threads
Coefficient of friction is greater than tangent of load angle
Course threads

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Machine Design
In hydrodynamic bearings

Do not require external supply of lubricant
Grease is used for lubrication
The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure

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Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the top of the tooth
Surface of the tooth above the pitch surface

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