A global distributor of precision measurement tools



A countersink is a type of hole used in machinery consisting of a conical shape usually cut into a part or piece of machinery. Typically, a countersink hole allows a screw or pin to be inserted with the tip of the screw or pin sitting flush with the surface of the surrounding material, or just below it. Serving as a functional surface, a countersink hole provides an area on which a fastener bears. Due to this functionality, the tolerance of both the angle and diameter of a countersink is crucial to its operation. Countersinks are usually small in diameter and the angles are specific, tending to be 30, 82, 90,100, or 130 degrees.

Back to entire glossary
Live Chat
Cart Summary