Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Process annealing
Spheroidising
Normalising

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Machine Design
Cap screws are

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

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