Set screw
A set screw is a type of screw that exerts its clamping force through the bottom tip that projects through an open thread hole rather than a with larger head that remains outside.
Imagine a sleeve or metal pipe. Now put a loose-fitting bar inside that sleeve. They slide relative to each other, don't they? How would you prevent them from sliding? Well, you might make a small threaded hole in the outer sleeve, put a screw in it, and tighten it until it presses against the inner bar and stops the two from sliding. That screw is called a set screw. Set screws are also used to secure gears and wheels on shafts, preventing both sliding and rotation.
Set screws appear with a variety of tip types;
 Flat Point
Domed Point
Cone Point
Cup Point
Knurled Cup Point
Dog Point
They also appear with a variety of drive styles —
Allen (hex)
Square head
Slotted
Bristol® spline
In British parlance they are often called grub screws.
External links
Page illustrating various set screw tip types
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