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Help CenterBrass Ferrule Cap for Tube Fittings With NPT Thread Standard
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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.
This brass ferrule cap is designed for optimal performance in tube fitting applications. Key features include:
Durable Construction: Made from high-quality brass, it offers excellent corrosion resistance, making it ideal for harsh industrial settings like hydraulic and pneumatic systems.
Secure Sealing: The NPT (National Pipe Taper) thread standard ensures a tight, leak-proof fit, preventing fluid or gas escape in high-pressure environments.
Easy Installation: Simple to assemble with standard tools, reducing downtime and labor costs during maintenance or setup.
Versatile Compatibility: Works seamlessly with various tube sizes and fittings, providing flexibility across multiple applications such as plumbing, automotive, and manufacturing.
Technical specifications highlight its robustness and adaptability. Below is a summary of key parameters:
| Parameter | Details |
| Material | Brass |
| Thread Type | NPT Standard |
| Size Options | 1/8" to 2" NPT (custom sizes available) |
| Temperature Range | -20°C to 120°C |
| Pressure Rating | Up to 300 PSI |
Advantages for customers include extended equipment lifespan due to reduced wear, cost savings from minimized leaks, and enhanced safety in operations. For instance, in hydraulic systems, this cap prevents contamination and ensures consistent flow, leading to fewer breakdowns. Its brass build resists oxidation, maintaining integrity in humid or corrosive conditions, while the standardized thread allows for easy integration with existing setups.
As a Shanghai-based company, Shanghai Quanbao Electronic Materials Technology Co., Ltd. leverages local expertise and stringent quality control to deliver trustworthy products. Our Brass Ferrule Cap is backed by rigorous testing to ensure it meets industrial demands, providing peace of mind for global clients. We encourage you to reach out for personalized consultations or bulk orders to optimize your systems. Experience the reliability of our solutions—contact us today to discuss how this cap can benefit your specific applications.
Frequently Asked Questions (FAQ)
Q: What is the primary material of this ferrule cap?
A: It is crafted from brass, known for its durability and corrosion resistance in industrial environments.Q: What does NPT thread standard mean for this product?
A: NPT (National Pipe Taper) ensures a tapered thread design that creates a secure, leak-proof seal when tightened, suitable for high-pressure applications.Q: Can I order custom sizes for specific tube fittings?
A: Yes, sizes are customizable upon request to match your unique requirements, such as different diameters or thread configurations.Q: How does this cap improve system efficiency?
A: By providing a reliable seal, it reduces fluid leaks and contamination, leading to lower maintenance costs and improved operational uptime.Q: Is it easy to install without specialized tools?
A: Absolutely, it can be installed using standard wrenches, making it user-friendly for quick assembly or replacements.Q: What industries commonly use this type of cap?
A: It's widely applied in hydraulic systems, pneumatic controls, plumbing, and automotive industries for sealing tube ends.Q: Are there options for different finishes or colors?
A: The standard finish is natural brass, but other finishes may be available upon inquiry for aesthetic or functional needs.Q: How does Shanghai Quanbao ensure product quality?
A: Based in Shanghai, we adhere to strict manufacturing protocols, with each cap inspected for consistency and performance before shipment.
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