Set Screws, Cup Point
Set Screws are essentially a headless bolt, which has a hex socket in the driving end. They are commonly used when a protruding head would be in the way of other moving parts. Their most common function is to secure two parts together, but without a pre-determined positioning point between them. A prime example is fixing a pulley wheel along a drive shaft, where the set screw in the wheel’s hub is tightened into the side of the drive shaft and holds them tight due strictly to friction.
Set screws are available either as a black hard steel alloy, or as stainless steel.
Because of its headless shape, and how it bores through its hole, a set screw is also known as a “grub screw”.
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