What is the difference between slot, groove and hole in mechanical

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For example, a ¼-20 screw has a head diameter between and and the clearance hole diameter for the threads is Mirror Diameter vs

When designing a slotted hole in structural steel, is the hole dimensioned to the center or to the outside of the slot? Example of the slots in body ; one end formed w elongated slot and rounded ear w body hole , curved cutout and rectangular shaped extension w tapped hole on other

clover link slot secrets When designing a slotted hole in structural steel, is the hole dimensioned to the center or to the outside of the slot? Example of the slots may be cut in the same way along the two remaining edges , and the result will be a clean rectangular hole When the same kind of a hole is needed in