Countersink bits for metal

In this section GRAFF countersink bits with straight and arc flutes are introduced. They are intended for processing holes. Countersinking allows to remove burrs and improve hole quality. A countersink bit is used for rough processing or finishing.

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Showing all 11 results

Useful information:

A countersink bit is a metal cutting tool designed to improve surface smoothness and hole accuracy. Processing a hole with a countersink bit is countersinking and it allows you:
– to achieve high quality standards;
– to remove out-of-roundness, tapering and other defects;

According to fixation, countersink bits are divided into the following groups:
– shank-type (with a cylindrical or conical shank);
– shell-type.

By design, countersink bits are classified as the following:
– solid ones. They look similar to drill bits, that’s why they are sometimes called countersink drill bits. The difference is in the presence of a larger number of spiral grooves and cutting edges (3-6 teeth). As a rule, they are made of high-speed steel with carbide inserts.
– National teams.
– Welded.

Choice of a countersink bit

The correct selection of a metal cutting tool for countersinking is a very important stage, so you must pay attention to the following points:
– The type of tool is selected depending on the processed material, the nature of the treatment. The location of the hole must also be considered.
– The size of the tool for countersinking is selected based on depth, diameter and required accuracy of the hole itself.
– The design of the core drill is selected depending on the method of mounting the core drill on the machine or in the tool.
– The material of the countersink bit depends on the material being processed (there are countersink bits for wood), the intensity of the operating mode and other factors.

Countersinking is a much more productive process than cutting. The cutting speed for a high-speed steel countersink bit is close to the drilling process, however, feed rate is 2.5–3 times higher. That’s why countersinking is faster than drilling.