Tap drill bit

Tap drill bit is a kind of tapping tool for processing internal thread. According to its shape, it can be divided into spiral groove tap, edge angle tap, straight groove tap and pipe thread tap. According to the use environment, it can be divided into manual tap and machine tap. According to the specification, it can be divided into metric, American and British taps. Tap is the most mainstream processing tool used by manufacturing operators in tapping.

Tap drill tap Details

Machine and hand taps are standard taps for cutting ordinary threads. China has traditionally referred to high-speed steel molar taps with higher manufacturing precision as machine taps, and carbon tool steel or alloy tool steel rolling (or incisor) taps as hand taps. In fact, the structure of the two The working principle is basically the same. Usually, the tap consists of a working part and a shank. The working part is divided into a cutting part and a calibration part. The former is ground with a cutting cone and is responsible for the cutting work, and the latter is used to calibrate the size and shape of the thread.

Tap drill bit Features

For processing ordinary internal threads on nuts or other machine parts (ie tapping). Machine taps usually refer to high-speed steel grinding taps, suitable for tapping on machine tools; hand taps refer to carbon tool steel or alloy tools Steel rolling (or incisor) taps are suitable for manual tapping.

The tap is a tool for processing various medium and small size internal threads. It has a simple structure and is easy to use. It can be operated manually or on a machine tool. It is widely used in production.

For small-sized internal threads, taps are almost the only machining tool. The types of taps are: hand taps, machine taps, nut taps, extrusion taps, etc.

Tapping is a relatively difficult machining process, because the tap is almost buried in the workpiece for cutting, and its processing load per tooth is greater than other tools, and the contact surface of the tap with the workpiece along the thread is very large. When cutting the thread It must contain and exclude chips, so it can be said that the tap works under very harsh conditions. In order to make tapping go smoothly, various problems that may arise should be considered in advance. Such as the properties of the workpiece material, what tool and machine tool to choose, how high the cutting speed to choose, and the amount of feed.


  1.  According to the different drive: hand taps and machine taps
  2. According to the processing method: cutting taps and extrusion taps According to the threads to be processed: metric coarse thread taps, metric fine thread taps, pipe thread taps, etc.
  3. According to its shape, it is divided into straight flute taps, spiral flute taps and spiral point taps.
  4. According to the tapping direction of the tap during use, it can be divided into down-and-down taps and inverted taps.

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