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Drill Bits (3461)

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There are 6 types of drill bits: twist drills, flat drills, deep hole drills, reamers, countersink drills, and center drills. Twist drill is the most widely used hole machining tool. The cutting part of the flat drill is spade-shaped, simple in structure, low in manufacturing cost, and cutting fluid is easily introduced into the hole, but the cutting and chip removal performance is poor. Deep hole drilling usually refers to a tool for processing holes with a ratio of hole depth to hole diameter greater than 6.
1. Twist drill. Twist drill is the most widely used hole machining tool. Usually the diameter ranges from 0.25 to 80 mm. It is mainly composed of the working part of the drill bit and the shank. The working part has two spiral grooves, which resemble twists, hence the name. In order to reduce the friction between the guide part and the hole wall during drilling, the twist drill gradually decreases in diameter from the drill tip to the shank to form an inverted cone shape. The helix angle of the twist drill mainly affects the size of the rake angle on the cutting edge, the strength of the blade and the chip removal performance.

2. Flat drill. The cutting part of the flat drill is spade-shaped, simple in structure, low in manufacturing cost, and cutting fluid is easily introduced into the hole, but the cutting and chip removal performance is poor. The structure of the flat drill has two kinds of integral type and assembly type. The integral type is mainly used for drilling micro-holes with a diameter of 0.03-0.5 mm. The assembled flat drill blades are replaceable and can be internally cooled. They are mainly used for drilling large holes with a diameter of 25 to 500 mm.

3. Deep hole drilling. Deep hole drilling usually refers to a tool for processing holes with a ratio of hole depth to hole diameter greater than 6. Commonly used gun drills, BTA deep hole drills, jet drills, DF deep hole drills, etc. Nested drills are also often used for deep hole processing.

4. Reaming drill. The reamer drill has 3 to 4 teeth, and its rigidity is better than that of a twist drill. It is used to expand the existing hole and improve the processing accuracy and smoothness.

5. Countersinking. The countersink has more teeth, and the hole ends are processed by the forming method. The countersink drill has more teeth, and the hole end is processed into the required shape by the forming method, which is used to process the countersunk hole of various countersunk screws or flatten the outer end surface of the hole.

6. Center drill. The center drill is used to drill the center hole of the shaft workpiece. It is essentially a composite of twist drills and counter drills with a small helix angle, so it is also called a composite center drill. It can be used to process the countersunk holes of various countersunk screws or flatten the outer end faces of the holes.

Drill Bits


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