What are these bolts called?
Scale is in inches.
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You'll find these in automobiles pressed through the backing plate for wheels, also known as wheel studs. The hole in which the stud is placed is undersize for the stud, which causes the grooves to embed in the side of the hole, providing resistance to rotation when the wheels are secured in place.
O'Reilly Auto Parts has a listing for various sizes, specific to vehicle model type.
Image from linked site
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