Drill taps

Screwing tapsare metal-cutting devices which are designed for cutting a thread in preliminarily drilled holes. The working element of the devices is made as a screw with the cone-shaped cutting part and the cylindrical gauging part. It usually has longitudinal flutes for chip removal. The device is secured in the tap wrenchor a machine with the help of the shank.

Types of screwing taps

By operation method:

• Hand taps. They are used with tap wrenches or without any auxiliary tools. They are often sold in sets consisting of 3 products: for rough, medium and finish processing.
• Machine taps. Their shank is secured in the machine chuck.
• Machine/hand taps. They are compatible with different types of equipment.

By the shape of the working part:

• cylindrical;
• conical.

By thread profile. It can be:

• triangular;
• square;
• trapezoidal;
• buttress.

By thread handedness:

• right-hand (they are rotated clockwise during cutting);
• left-hand (they are rotated counterclockwise during cutting).

By the shape of longitudinal flutes for chip removal. They can be:

• straight;
• spiral.

Also there are fluteless screwing taps. Their use doesn’t involve chip formation because they are used for forming the thread in the parts made of soft metals.

Moreover, manufacturers offer different types of tools for working with certain components:

• Nut taps. They are used for processing the through hole in nuts; such taps have an extended length.
• Pipe taps. They are intended for cutting the thread in the pipe connection elements.
• Die taps. They are used for making thread-cutting dies.

Dimensional parameters of the tools presented in catalogues can be given in the units of the metric or inch system of measurements. The devices also differ in the materials they are made of: these can be hard alloys, high-strength high-speed steels, or tool steels.

Tips on screwing taps use

1. Use the devices of the size which corresponds to the hole to be processed. Observe manufacturer’s recommendations to choose the correct parameters.
2. Don’t use tools with the worn out working part. Otherwise it can break during working and it will be difficult to remove the broken piece.
3. Use the grease. It provides smooth running of the tool and protects its working part from corrosion.
4. Clean the tool from chips during working. For this, turn it backwards by a half-turn from time to time.

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