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Help Center316L Stainless Steel Ferrule Cap for High-Pressure Tube Fittings
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Although this part has a threaded and hexagonal structure and may be colloquially referred to as a "plug," judging from its deep cylindrical cavity at the top and overall shape, it is actually a single-ended welding adapter (often called a plain shank union or cup union within the industry).
This type of adapter is typically used at the end of piping systems. Its internal cylindrical cavity is designed for manual welding (socket weld) directly to a tube, or to serve as a connection port for instrument impulse lines or precision equipment.
To help you fully understand and provide accurate selection criteria, I have listed the core parameters for this welding adapter and for the conventional ferrule cap you mentioned.
I. Core Parameters of This Part (Single-Ended Welding Adapter)
If you are looking for the part shown in the image, you typically need to pay attention to the following key dimensions:
Thread Specification: The external thread at the bottom determines which equipment or flange it can be screwed into. Common specifications include metric M14, M20 or imperial G1/2, R1/4, etc.
Plain Shank/Cup Inner Diameter: The diameter of the hollow interior at the top determines the outer diameter of the tube it can accommodate. Common examples include Φ6mm, Φ8mm, Φ10mm, etc.
Hexagon Across Flats Dimension: The width of the hexagon on the side (often called the S value) determines the size of wrench you need to tighten it.
Material and Temperature/Pressure Resistance: Common materials include 304/316 stainless steel, brass, etc. The maximum working pressure for this type of adapter is typically between 1.0 MPa and 40 MPa, depending on the specific structure and material.
II. Core Parameters of a Conventional "Ferrule Cap"
If you subsequently need to purchase a ferrule-type cap for sealing a pipeline, its parameter logic is completely different from that of the welding adapter:
Tube Outer Diameter Specification: The ferrule cap fits over the outside of the tube. Its core parameter is the tube outer diameter (OD) it accommodates, e.g., Φ6mm, Φ10mm, etc.
Thread Type: The tail thread used for tightening and securing. Common types include ZG, G (BSPP), NPT, etc.
Sealing Method:
Cone Seal: Relies on the cone surface at the front of the cap compressing against the ferrule to create a seal.
O-Ring Seal: Relies on a rubber O-ring for a face seal, allowing for easier assembly and disassembly.
Manufacturing Standards: Common national standards (e.g., GB/T 3760) or international standards (e.g., ISO 8434-1). These standards specify mechanical dimensions such as the total length (L) of the cap and the hexagon across flats (S) for different tube diameters.
💡 Suggestion:
If you plan to purchase this part shown in the image to replace an interface on your equipment, it is recommended that you use a caliper to measure the external thread diameter at the bottom (to determine the thread specification) and the inner diameter of the hollow cavity at the top (to determine the tube size). This will help you find an exact matching model.
The 316L stainless steel construction provides superior strength and resistance to harsh chemicals, making it ideal for industries like oil and gas, chemical processing, and hydraulic systems. Key features include:
Enhanced Durability: Resists wear and tear from high-pressure cycles, extending the lifespan of your fittings.
Easy Installation: Designed for quick assembly with standard tools, minimizing setup time.
Versatile Compatibility: Works seamlessly with a wide range of tube fittings, ensuring broad application.
Leak Prevention: Provides a secure seal to prevent fluid leaks in critical systems.
These attributes translate to tangible benefits for your operations. For instance, the corrosion resistance reduces maintenance costs by withstanding acidic or saline environments, while the high-pressure capability ensures safety in critical applications. Clients report improved system reliability and reduced replacement frequency, leading to lower total ownership costs. Additionally, the cap's lightweight design facilitates handling without compromising strength, making it a practical choice for both new installations and retrofits.
Leverage the expertise of Shanghai Quanbao Electronic Materials Technology Co., Ltd. in Shanghai, China, to access a product backed by rigorous quality control and industry experience. Our ferrule cap is a testament to our dedication to innovation and customer satisfaction, offering a dependable solution for your high-pressure needs. Contact us today to discuss how this component can optimize your systems and request a customized quote for your specific requirements. Partner with us for reliable performance and professional support in all your industrial projects.
Frequently Asked Questions (FAQ)
Q: What is a ferrule cap used for in tube fittings?
A: It seals and protects the end of tubes in high-pressure systems to prevent leaks and damage.Q: Is this cap compatible with all types of tube fittings?
A: Yes, it's designed for standard high-pressure fittings, but compatibility can be confirmed for specific models.Q: How does the 316L stainless steel handle corrosion?
A: 316L grade offers excellent resistance to rust and chemicals, ideal for harsh environments like marine or chemical plants.Q: Can I get this cap in non-standard sizes?
A: Absolutely, sizes are customizable upon request to fit unique applications.Q: What pressure levels can this ferrule cap withstand?
A: It's rated for high-pressure systems, typically up to 10,000 psi, depending on configuration.Q: How easy is installation for this product?
A: It features a simple screw-on design for quick assembly with basic tools.Q: Is it suitable for extreme temperatures?
A: Yes, it operates reliably in temperatures from -50°C to 200°C without degradation.Q: What industries commonly use this ferrule cap?
A: Widely applied in oil and gas, aerospace, and manufacturing for fluid handling systems.
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