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Threads commonly used in Piping

Piping thread standards.

Thread Standards

Most piping threads are produced to national or industry group standards describing threads form - threads angle, pitch and diameter. Common standards are

TPI/Pitch

In general pitch refers to threads per inch (TPI) for fractional screw threads and pipe threads. For metric screw threads pitch refers to the distance between threads.

Piping Threads

Common piping thread standards in the United States are

Other common piping thread standards

More about standards applied for piping threads.

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