St. Louis, Missouri
Our Pipe Threading machine can thread pipe from ½" schedule 40 through 6" schedule 80. After cutting material to length, threads can be added to one or both ends of the steel pipe.
A pipe thread is a spiral ridge on the end of a pipe that enables pipes to be joined together. For male fittings, pipe thread appears on the outer diameter of the pipe; if female, the pipe thread appears on the inner diameter. By rotating a male pipe end into a female pipe thread, the two fittings become joined. Since male and female pipe thread must align successfully to form a connection, manufacturers follow pipe thread industry standards.
The two main pipe thread standards are as follows:
At One Stop Steel Corporation, we thread to the NPT standard.
In the United States, William Sellers set the standard for nuts, bolts, and screws which became the National Pipe Tapered Thread (NPT) in 1864. His 60-degree thread angle with flat crests and roots is the American standard for tapered threads to join pipes and fittings. The ANSI/ASME standard B1.20.1 covers threads of 60-degree form in sizes from 1/16" to 24" Nominal Pipe Size (NPS).
The taper rate for NPT threads is the same as BSPT (3/4" per foot) measured by the change of diameter (of the pipe thread) over distance. Sometimes NPT threads are referred to as MPT ('Male Pipe Thread'), MNPT, or NPT(M) for male (external) threads.
1390 Kingsland Ave. St. Louis, MO 63133
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Mon - Fri 7:30 am - 3:00 pm