ASTM A105 Threaded and Socket Pipe coupling

Mar 12, 2026

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A105 NPT GI COUPLING

ASTM A105 Threaded and Socket Pipe coupling

In pipeline engineering, the term 'coupling' specifically refers to fittings used to connect two pipe sections, usually with internal threads or sockets, in order to achieve mechanical connection through threaded tightening, welding fixation, or clamping, while also playing a role in sealing, leakage prevention, and displacement compensation
Pipe coupling, it is a commonly used accessory in industrial pipeline connections. A short pipe used to connect two pipes. Also known as an external connector. Materials include carbon steel, stainless steel, alloy steel, etc. Connection methods include threaded connection and welding

1: According to its manufacturing process, it can be divided into two types: forging and casting. Forging refers to the process of heating and forging steel ingots or round bars into shape, and then threading them onto a lathe. Casting refers to the process of melting steel ingots and pouring them into a fixed pipe clamp mold, which is then cooled to form the final product.

2: According to the type of connection, it can be divided into two types: threaded and socket welding.

3: The main manufacturing standards for Pipe coupling generally include GB/T14383, ASME B16.11, and BS 3799

There are three types of Pipe coupling: full Pipe coupling, half Pipe coupling, and Pipe reducing coupling
Full pipe coupling are used to connect small-diameter pipelines. It is used to connect pipes to pipes or pipes to profiles or joints. It can be of threaded or socket end type.
Half pipe coupling are used for small aperture branching from containers or large pipelines. It can be of thread or socket type. It only has one socket or threaded end on one side.
The Pipe reducing coupling is used to connect two different sizes of pipes. It is like a concentric reducer, maintaining the centerline of the pipeline but with a small size.

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