Counterbores

A counterbore bit is a specialized tool that creates a cylindrical, flat-bottomed recess at the top of a pilot hole, allowing a fastener head to sit flush with or below the surface of the material. It differs from a countersink bit because its larger hole has a straight, 90-degree wall with no taper, ensuring a flat seating surface for the fastener head. This is essential for applications where a smooth finish is needed or where the fastener needs to be recessed. As always, if you are looking for a product that you do not see below, please reach out, and we can explore opportunities for custom orders.

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M2 High Speed Steel Adjustable Counterbores

7/16-14” Threaded Shank (#121)

Table listing item numbers, outside and inside diameters, twist length, overall length, and rotation direction for various parts, with some rows highlighted in blue.

M2 High Speed Steel Adjustable Counterbores

1/2” x 2” Shank (#122)

A technical chart displaying item numbers, outside diameter, inside diameter, twist length, overall length, and rotation direction for different parts. The table includes multiple entries with blue highlights on specific rows.

Carbide-Tipped Adjustable Counterbores

1/2” x 2” Shank (#122CT)

Table listing item numbers, outside diameter, inside diameter, twist length, overall length, and rotation direction for two items.

M2 High Speed Steel Multi-Spur Counterbores

(#120)

Close-up view of a black machine component or tool part with a textured surface, set against a plain white background.
Table listing item numbers, outside diameters, and bore sizes, with most bore sizes being 1/2 inch.

M2 High Speed Steel Adjustable Counterbores

(#123)

Close-up of a metal twist drill bit for drilling holes in hard materials.
Table listing item numbers, outside and inside diameters, and overall length measurements, with blue rows indicating specific items.

Carbide Tipped Adjustable Counterbores

(#123CT)

Close-up of a metal drill bit with a shank and a cutting edge
Table listing item numbers, outside diameter, inside diameter, and overall length of cylindrical components with a blue header and white background, highlighting three rows of product specifications.

Carbide Tipped Counterbore

Face Frame Bit with High Speed Steel Drill Bit (#135CT)

A close-up of a drill bit inside a metal handle.
Table listing item numbers and descriptions of spiral and M2 HSS drills, including sizes, types, and specifications.

M2 High Speed Steel Counterbore Kreg Drill

Table displaying item numbers, diameters, shanks, overall lengths, and rotation directions for two tools. The first row lists item number CB-18387 with three flats on the shank, 3/16 diameter, 3/8 shank, 7-inch overall length, rotating to the right. The second row lists item number CB-18387LH with three flats on the shank, 3/16 diameter, 3/8 shank, 7-inch overall length, rotating to the left.