Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

None of these
0.124 - (0.684/T)
0.154 - (0.912/T)
0.175 - (0.841/T)

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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
Used to prevent relative motion between two parts
Similar to stud

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