Pipe Threading

Overview

Steel pipe threading is a machining process that cuts helical grooves (threads) onto the exterior or interior of a pipe to enable secure, leak-proof connections with fittings, valves, or other pipes. Threaded pipes are widely used in plumbing, oil & gas, fire protection, and industrial piping systems where disassembly may be required.

Types of Pipe Threads

○ Tapered (NPT/BSPT): Self-sealing for high-pressure systems.

○ Parallel (BSPP): Requires gaskets for low-pressure uses.

○ Specialty (API/Metric): Oilfield or metric applications.

Threading Methods

1. Die Threading (Manual or Machine)

○ A die head cuts external threads by rotating around the pipe.
○ Suitable for on-site repairs or small batches.

2. Thread Milling (CNC Machining)

○ A milling tool creates precise threads via CNC control.
○ Ideal for large-diameter or high-accuracy threads.

3. Thread Rolling (Cold Forming)

○ Threads are formed by deforming the metal (no material removal).
○ Produces stronger, fatigue-resistant threads (common in automotive/aerospace).

Key Standards

ASME B1.20.1, ISO 7/228, API 5B.

Advantages of Threaded Pipes

○ Easily Assembled/Disassembled – No welding needed.

○ Versatile – Compatible with various fittings.

○ Cost-Effective – Lower installation time vs. welded joints.

For precision threading, CNC ensures tight tolerances. Contact us for specs!