Machine Design
Cap screws are

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

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Machine Design
In hydrostatic 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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