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Hex Socket Set Screws with Serrated Cup Point
Also known as hex socket grub screws with serrated cup point, hex socket headless screws with serrated cup point.
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Knurled cup set screws feature one slight variation from the cup point set screw. This style has serrated ridges, or knurls, in the indented cup that bite into the contact material and effectively lock in place for a powerful grip that resists loosening caused by vibration.