Screw fitting

Screw fitting can be connected to pipes of various materials such as PU pipes, PTFE pipes, and PE pipes.

The pipe body of screw on hydraulic fittings form a first opening and a second opening at both ends respectively. In the middle of the pipe body, a concave ring groove is provided, and an annular flange is formed on the inner wall of the pipe, near the first opening and the second opening. On the pipe walls of the two openings, a groove is respectively provided, and a convex point is formed on the inner wall of the pipe; the pipe body is assembled between the two threaded pipes, and the convex points on the inner wall of the pipe are used to snap into the threads of the threaded pipe , rotating the pipe body or the threaded pipe, the threaded pipe can be screwed in from the first opening and the second opening until it touches the flange, so as to extend the length of the threaded pipe.

Pipe with screws have the following characteristics:

◆ Available for pneumatic hoses. The most suitable tube is PU tube.◆ Can be changed according to the pressure of the pipe

◆ Threads are available in a variety of BSPT, BSPP, NPT and metric threads.

◆ There are spring sleeve type and rotary type.

Set screw wire connectors are generally used in water supply, fire protection, petrochemical, and other fields. Common threaded joints include: RPLW Male 90° elbow, RPL Male swivel 90°elbow, RPC Male straight.

What Is a Screw Fitting?

A screw fitting is a type of mechanical connection used to join pipes, tubes, or other components by screwing one part into another. These fittings are commonly used in plumbing, pneumatic, and hydraulic systems for their simplicity and reliability. They can provide a leak-proof seal when properly installed.

Types of Screw Fittings

Screw fittings are categorized based on their design, application, and threading type. Common types include:

1. Threaded Pipe Fittings:

• Male Thread: External threading on the fitting.

• Female Thread: Internal threading to receive male threads.

2. Compression Fittings:

• Uses a compression nut and ferrule to create a secure connection.

3. Quick-Connect Screw Fittings:

• Allows for faster assembly and disassembly, commonly used in pneumatic systems.

4. Flare Fittings:

• Features a flared end for additional sealing, often used in gas and refrigeration systems.

5. Swivel Fittings:

• Allows rotation while maintaining a secure connection, suitable for flexible hoses or dynamic systems.

Materials Used in Screw Fittings

1. Metal:

• Stainless Steel: Corrosion-resistant, ideal for harsh environments.

• Brass: Durable and widely used in plumbing and pneumatic systems.

• Aluminum: Lightweight but less durable.

2. Plastic:

• Commonly made from PVC or nylon, used in low-pressure applications.

Applications of Screw Fittings

1. Pneumatic Systems:

• To connect air hoses or pipelines in industrial machinery.

2. Plumbing:

• For water supply systems, waste systems, and drainage pipes.

3. Hydraulic Systems:

• Used in high-pressure fluid systems to connect hoses and valves.

4. Gas Supply:

• Provides secure connections for gas pipelines.

5. Industrial Automation:

• Widely applied in robotics and automated manufacturing setups.

Advantages of Screw Fittings

• Ease of Installation: Simple tools required for assembly.

• Reusability: Can be disassembled and reused.

• Leak-proof: Proper sealing with thread tape or sealant ensures a secure fit.

• Versatility: Suitable for a wide range of systems and pressures.

Factors to Consider When Choosing Screw Fittings

1. Thread Standard:

• Common standards include NPT (National Pipe Thread), BSP (British Standard Pipe), and metric threads.

2. Material Compatibility:

• Match the fitting material with the pipeline material to prevent galvanic corrosion.

3. Pressure and Temperature Ratings:

• Ensure the fitting can handle the system's operating conditions.

4. Size and Dimensions:

• Choose the right size based on pipe diameter and thread pitch.

Maintenance Tips for Screw Fittings

• Regularly check for leaks or loose connections.

• Use thread tape or sealant to enhance the seal.

• Avoid over-tightening to prevent thread damage.

• Clean threads before installation to ensure a proper fit.

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