Machine Design
Machine screws are

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

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Machine Design
The flank of the tooth is the

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

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Machine Design
Spring index is

Indication of quality of spring
Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

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