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The Front Ferrule is a critical component in compression tube fittings, designed to create a secure and leak-proof connection between tubing and fitting bodies. It is typically made from durable materials such as stainless steel, brass, or other alloys, depending on the application requirements. When the fitting nut is tightened, the front ferrule compresses and grips the tubing surface, ensuring a tight seal even under high pressure or vibration conditions.
Front ferrules are widely used in industries such as petrochemical, oil and gas, pharmaceuticals, and instrumentation, where precise and reliable connections are essential. Their design ensures easy installation without the need for welding or soldering, making them a preferred choice for maintenance-friendly piping systems. Moreover, they allow for repeated assembly and disassembly while maintaining sealing integrity.
The geometry of a front ferrule is engineered to achieve optimal sealing. It features a tapered inner surface that interacts with the tube’s outer surface, creating a mechanical hold. This ensures that the ferrule can withstand various thermal expansions, pressure changes, and vibrations without compromising the connection. This makes it highly suitable for both high-pressure gas and liquid applications.
In addition to standard versions, specialized front ferrules are available for corrosive environments, offering improved chemical resistance and longevity. For example, ferrules made from Hastelloy or other exotic alloys can handle aggressive media, while plated versions may offer additional surface hardness. This customization makes them versatile across multiple industrial setups.
Maintenance of front ferrules is minimal, as they are designed to perform reliably over a long service life. However, it is important to ensure proper installation torque and alignment for the best performance. When installed correctly, front ferrules contribute significantly to the overall safety and efficiency of fluid and gas systems.
Front Ferrule
Imperial Size: 1/4″ to 2″ NB
Metric Size: 6mm to 50mm
Imperial Size: 1/4″ to 2″ NB
Metric Size: 6mm to 50mm
Manufacturing Standard – ASTM
Dimensional Standard – ASME / ANSI B 16.9
| Type | Grade |
|---|---|
| Nickel Front Ferrule | 200 & 201 |
| Monel Front Ferrule | 400, R-405 & K-500 |
| Inconel Front Ferrule | 600, 601, 625 & 718 |
| Incoloy Front Ferrule | 800, 800H, 800HT, 825, 925 & DS |
| Hastelloy Front Ferrule | B-2, B-3, C-22, C-276, C-2000& X |
| Cupro Nickel Front Ferrule | Cu Ni 90/10 (C71500) / Cu Ni 70/30 (C70600) |
| Duplex Front Ferrule | S32205 / S31803 / S31550 / S31254 |
| Super Duplex Front Ferrule | SAF 2507, Zeron 100 & Ferralium 255 |
| Alloy 20 Front Ferrule | Alloy 20 / Carpenter 20 |
| 254 SMO Front Ferrule | 254 SMO |
| 904L Front Ferrule | SS 904L |
| Titanium Front Ferrule | Gr.2 & Gr.5 |
| Nitronic Front Ferrule | Nitronic 30, Nitronic50, Nitronic60 |
| Stainless Steel Front Ferrule | 304, 304L, 316, 316L, 316H, 321, 321H, 347, 446 |
The Front Ferrule is a small but essential part of compression fittings that provides a tight, leak-free seal between the tube and the fitting body. It securely grips the tubing when the fitting nut is tightened, ensuring a strong connection.
Front Ferrules are commonly used in industries like oil and gas, chemical processing, and instrumentation. They are easy to install, resist corrosion, and maintain reliable sealing even under high pressure and vibration.
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