The second chart below is a US fraction to metric mm for the more common sizes up to 4". That is often found when trying to match a screw size using Digital Calipers (Inch Decimal to Screw Size) or drill a hole (Screw size to Nearest Fraction) for your project. Point: the end of the screw that’s first driven into the material when a rotational force is applied. Thread: the spiral grooves which run down the length of the screw. Shank: the straight part of the screw which connects the head and thread. It is very helpful to know the decimal equivalent for a US screw size you have. All screws are made up of four main parts: Head: which has slots in the top to fit a compatible screwdriver/drill bit.
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