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Esoteric trivia. [View all]
Why is it called a countersink?
They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft. Therefore, when you drive a countersunk screw into an object or surface, the head will sink so that it's flush with the respective material.
Common angles are 82 degrees for inch-sized fasteners and 90 degrees for metric fasteners. 100 degrees is also a common option with metric hardware.
They are called “countersunk screws” because they “sink” into objects and surfaces. They feature a flat head that tapers along the shaft. Therefore, when you drive a countersunk screw into an object or surface, the head will sink so that it's flush with the respective material.
Common angles are 82 degrees for inch-sized fasteners and 90 degrees for metric fasteners. 100 degrees is also a common option with metric hardware.
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