HSS Single Flute Countersink Drill Bit

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Countersink holes are made with countersunk drills and are widely used in processing many types of materials. Therefore, by processing smooth holes or countersunk holes on the surface of the workpiece, fasteners such as screws and bolts can be fixed vertically to the workpiece. Although pilot holes are required for subsequent processing, their use greatly improves work efficiency and processing quality. In a cylindrical countersink, the end cutting edge performs the main cutting function, and the bevel angle of the spiral groove determines its rake angle. To ensure good centering and guidance, the countersink has a guide post at the front with a diameter close to the existing hole in the workpiece.

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Counter sinks have a sharp cutting edge at the end of their end, while spiral flutes have a bevel angle, often known as rake angle, at their tip. In order to ensure good centering and guidance of this drill, it comes with a guide post that fits snugly into the existing hole that is already in the workpiece in order to ensure good centering and guidance. As a result of this cylindrical shaft and tapered head with an oblique hole, clamping is made easier. The tapered tip is equipped with a beveled edge, which is suitable for cutting purposes. Through the through hole, the iron chips are able to be rotated and discharged upwards as a result of the chip discharge hole. Centrifugal forces can be very helpful in scraping off the iron filings on the surface of a workpiece, so that they will not scratch the surface and negatively affect the quality of the workpiece. There are two types of guide posts, and countersunk holes can also be made in one piece if necessary.

Countersink drills are used for a variety of tasks including countersinking and processing smooth holes. Their unique design and structure make it easier for the user to work efficiently and improve the quality of the finished product.

Forthread D L1 d
3/16" 3/4” 1-1/2" 3/16"
1/4” 3/4” 2" 1/4”
5/16" 1" 2" 1/4"
3/8" 1” 2” 1/4”
5/2” 1” 2” 1/4”
5/8 1-1/8" 2-3/4" 3/8"
5/8” 1-1/8” 2-3/4” 1/2"
3/4” 1-5/16" 2-3/4" 3/8”
3/4” 1-5/16” 2-3/4" 1/2"
7/8" 1-5/16” 2-3/4” 1/2"
1” 1-5/16" 2-3/4" 1/2”
1-1/4” 1-5/8" 3-3/8" 3/4”
1-1/2" 1-5/8 3-1/2" 3/4”
2” 1-5/8 3-3/4” 3/4”

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