Hand Tapping Process
Hand tapping cuts tools that produce helical grooves in a hole in order to insert a fastener. Taps are used in multiple industries and trades. Hand taps come in three basic configurations:
- Taper
- Plug
- Bottoming
Taper Taps
Taper taps have the first 7 – 10 threads at the tip ground flatter than the main body of the tap to enable easy starting of the threads in the hole. Sometimes called a starter tap, taper taps can be used to start the thread in a blind hole for another tap to finish or used to cut threads all the way on a through hole.
Plug Taps
Plug taps are like taper taps in that they taper threads at the starting end of the tap. The difference is there are fewer of them, usually the first 3-5 threads, so you get to cutting a full thread sooner. This makes the process much quicker than using taper taps.
Although they are much quicker, they are not as easy to start a thread when comparing to Taper. If you can only buy one type of tap, and you’re a patient user, plug taps can be a good choice because they are still easy to start, but they can also form complete threads deeper into a blind hole than a taper tap.
Bottoming Taps
Bottoming taps have no ground threads at the starting end and are generally used after, and in conjunction with a taper or plug tap. Bottom taps can cut threads to the bottom of blind holes although they do not do well at starting threads.
This means that bottoming taps should be used exactly where the name implies, at the bottom. Think of this tap as the finishing touch to tapping.
Capable Applications
Hand Tapping can be used in many different industries that include:
- Furniture
- Automobile bodies
- Boats
- Shoes
- Brush handles
- Golf-club heads
- Aerospace
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