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What’s a Tap Drill Bit and How Does It Work?
What’s a Tap Drill Bit and How Does It Work?

A tap drill bits is a tool attachment designed specifically for metalwork tapping. This technique allows you to drill a hole in a material so that a threaded bolt may be attached. An attachment can also be used for repair or rethread of damaged fixings. You can use a tap tool together with a tool to make internal and exterior threads.

Tap drill bits are essentially long bolt threads that are inserted into drill chucks to accelerate the process for forming internal threads. These bits are made from hardened tungsten and can be used multiple times to form threads of different metals. Tap drill bits are capable of creating an internal thread. Sometimes referred to as the female portion of a coupling like that found in a standard-sized nut,

A die bit, or partner attachment to the tap drill bit, is a die bit. It forms an external thread (or male section) of a coupling just like a bolt. Tap bits and the die bits are often paired together to ensure the proper joining of the male section and the female section. Both types of bits have numbering systems that are based on the diameters of the resulting threads. This allows for the creation of matching pairs.

Metal machinists can use three types tap drill bits. These are the taper, intermediate, or bottoming tap. The bottoming tap has a flat-head bit with little to no tapering at the tip and shaft. This type of drill bit is used to form fully threaded holes in metal. For example, a piece furniture with legs that need to be screwed into the base or platform. A machinist will need to use this type of bit because the flat head on the bottoming tap's head cannot provide enough buy in an unthreaded area.

Taper and intermediate taps each have a slightly tapered tip. The tap drill bit most commonly used is the intermediate tap. These types of bit have a tapered edge to help align the threads. The taper bit is more suitable for work with hard materials like steel alloy, as it has a slower tapering.

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