Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Length, width and speed
Viscosity, speed and bearing pressure
Viscosity, speed and load
Length, width and load

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Machine Design
Set screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Used to prevent relative motion between parts
Slotted for a screw driver and generally used with a nut

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