What Is a Pine Tap?
A pine tap is a processing tool designed for threading the female threads of both parallel and tapered pipe threads, which are used for connecting or joining pipes.
Pine taps are classified into two categories: parallel thread taps and tapered thread taps. Parallel thread taps are used for machining threads that are mainly intended for mechanical joints, while tapered taps are used for machining threads that need to be watertight and airtight, such as water and gas pipes.
Given the variety of standards for pine taps depending on the piping type, the thread standard, thread diameter, and pitch are selected according to the purpose of processing.
Principles of Pine Taps
Unlike standard parallel taps, pipe taper taps require cutting even on the fully threaded part, which results in high frictional resistance and requires 2 to 3 times the cutting torque of a hand tap.
The machining of pine tapered thread requires the proper setting because the diameter of the entrance varies depending on the machining depth of the tap.
Depending on the thread length required by the drawing, the tap may be a long or short thread, or a special tap may be used to process even shorter thread lengths.
In the case of the PT1/8-28 TPT long-threaded taper tap, the reference diameter position is approximately 13 mm.
In the case of taper tap PT1/8-28 S-TPT short-thread type, the reference diameter position is approx. 10.5 mm (0.4).
When a tap is replaced, if the same machining depth is used as before, it may not pass the taper thread gauge for pine taps. Therefore, when replacing a taper tap with a new one, it is necessary to make a shallow relief cut based on the reference diameter position each time, and adjust the cutting depth to pass the gauge while checking with the gauge.