Countersinks, Center Drills & Spotting Drills

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Countersinks expand the top of an existing hole in a workpiece to allow countersinking screws to install flush with the surface of the workpiece. This helps prevent the workpiece material from swelling when a screw is inserted in the hole and tightened down. They can also be used to debur holes for a smooth finish. Drill bit countersinks allow users to both drill a hole and countersink the top of the hole with one tool. Center drills have a pilot drill and a countersink and are used to create holes at the center of a piece of stock so it can be turned between centers on a lathe. The pilot drill creates a small hole in the stock and the countersink expands the hole, leaving a small gap at the bottom of the hole that helps protect the lathe's centers from damage when the stock is turned on it. The flute or tip style of the countersink or center drill can optimize the tool's performance in different materials or metalworking applications.

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High-Speed Steel Center Drills with Plain Tip

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High-speed steel center drills provide good wear resistance in a wide range of machining applications. Center drills with a plain tip are the standard choice for creating center holes in a piece of stock to prepare it for turning between centers on a lathe.

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Fast-Cut High-Speed Steel 1-Flute Countersinks

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High-speed steel countersinks provide good wear resistance in a wide range of countersinking applications. Single-flute countersinks are suitable for use at high speeds. They leave clean edges on holes and have a high, positive rake that reduces vibration as they expand the top of an existing hole in a workpiece to ensure screws install flush with the surface of the workpiece.

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General Purpose High-Speed Steel 3-Flute Countersinks

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High-speed steel countersinks provide good wear resistance in a wide range of countersinking applications. General purpose 3-flute countersinks are the most commonly used type of countersink. They expand the top of an existing hole in a range of materials to ensure screws install flush with the surface of the workpiece. Three-flute countersinks typically provide better chip clearance and perform better when machining stringy materials than countersinks with more flutes.

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Countersink Sets

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Countersinks expand the top of an existing hole in a workpiece to ensure screws install flush with the surface of the workpiece. This can prevent the workpiece material from swelling when a screw is installed in the hole and tightened down. They can also be used to debur holes for a smooth finish. These sets contain multiple countersinks in a range of sizes.

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