Pipe Tap

Pipe tap, also called pipe thread tap or tap, uses a cutting tool to create internal threads in a hole or pipe.  It is specifically designed to create threads that conform to standard pipe thread sizes and specifications.  Pipe taps typically have a tapered shape with cutting flutes along the body.  The cutting flutes spiral around the tap, allowing it to cut into the material gradually as it is rotated.  The tapered design helps guide the tap into the hole and allows it to gradually cut threads of increasing depth.

Pipe taps come in various sizes and types, corresponding to different pipe thread standards such as NPT (National Pipe Thread) or BSP (British Standard Pipe).  These standards define the thread dimensions, pitch, and taper angle, ensuring compatibility between different pipe fittings and connections.

When using a pipe tap, the material being threaded, such as metal or plastic, is first drilled to the appropriate size to accommodate the tap.  The tap is then inserted into the hole and rotated clockwise, usually with the aid of a tap wrench or machine.  As it cuts into the material, it forms the internal threads required for connecting pipes or fittings.  Pipe taps are commonly used in plumbing, construction, and other industries where threaded connections are required for pipes, fittings, and valves.  They are essential for creating leak resistant and secure connections in various plumbing and piping systems.

Pipe Tap Types

There are several types of pipe taps available, each designed for specific purposes and thread standards.  Here are some commonly used types:

Taper Pipe Tap (NPT or BSP)  -  The taper pipe tap has a gradual taper along the cutting section, allowing it to create tapered threads.  It is used for creating internal threads in pipes or fittings with NPT (National Pipe Thread) or BSP (British Standard Pipe) thread standards.
Plug Pipe Tap (NPT or BSP)  -  The plug pipe tap, also known as a bottoming tap, has a shorter chamfer or taper compared to the taper pipe tap.  It is used for cutting threads closer to the bottom of a blind hole, where a full thread depth is required.  Like the taper pipe tap, it is used for NPT or BSP thread standards.
Interrupted Thread Pipe Tap  -   This type of tap is used to create interrupted or segmented threads. Interrupted thread taps have flutes that are interrupted along the cutting section, allowing them to cut threads in non-continuous patterns.  They are commonly used in special applications where threaded connections need to be disassembled or adjusted easily.
Straight Pipe Tap  -   Unlike the tapered pipe taps, the straight pipe tap creates straight or parallel internal threads.  It is typically used for specific thread standards such as NPS (National Pipe Straight) or for creating threads in rigid conduit fittings.
Acme Pipe Tap  -   The Acme pipe tap is used for creating Acme threads, which are trapezoidal shaped threads with larger flat crests and roots.  Acme threads are commonly used in applications requiring high load bearing capacity or in power transmission systems.

It's important to choose the appropriate pipe tap based on the thread standard required for the application and the specific threading requirements, such as taper or straight threads, full depth threads, or interrupted threads.  Additionally, using the correct tap size and using appropriate cutting lubricants can help achieve clean and accurate threads while prolonging the life of the tap.