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Flared Thread Fitting

Updated: 2026-07-31

Overview

Flared screw-in fittings are specialized connectors widely used in hydraulic and pneumatic systems. They are designed with a flared end that creates a tight seal when screwed into a corresponding port, preventing leaks even under high pressure. These fittings are crucial in industries such as automotive, aerospace, and manufacturing, where reliable fluid transfer is essential. The design of flared screw-in fittings allows for easy installation and removal, making them a preferred choice for maintenance and assembly operations. They are available in various materials, including brass, stainless steel, and carbon steel, to suit different environmental and operational requirements.

Structure and Working Principle

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The flared screw-in fitting consists of a threaded body and a flared end. The flared end is typically machined at a 37° or 45° angle to match the mating surface, ensuring a secure seal. When the fitting is tightened, the flare compresses against the seat, creating a metal-to-metal seal that withstands high pressure. The threaded portion of the fitting ensures a secure connection, while the flare prevents the tube from slipping out under pressure. This dual-action design makes flared screw-in fittings highly reliable for critical applications where failure is not an option.

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Key Features

Flared screw-in fittings offer several advantages over other types of connectors. Their leak-proof design ensures minimal fluid loss, which is critical in high-pressure systems. The metal-to-metal seal provides durability and resistance to vibration, making them ideal for dynamic environments. Additionally, these fittings are reusable, allowing for disassembly and reassembly without compromising performance. Their standardized flare angles and thread sizes ensure compatibility with a wide range of tubing and equipment, simplifying inventory management for B2B buyers.

Application Areas

Flared screw-in fittings are commonly used in hydraulic systems, pneumatic systems, and fuel lines. They are found in industrial machinery, construction equipment, and transportation vehicles, where reliable fluid transfer is essential. In the automotive industry, these fittings are used in brake lines and fuel systems. In aerospace, they are employed in hydraulic control systems. Their versatility and reliability make them a staple in many high-performance applications.

Maintenance and Precautions

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Proper installation is critical to the performance of flared screw-in fittings. Over-tightening can damage the flare, while under-tightening may result in leaks. It is recommended to use a torque wrench to achieve the correct tightening force. Regular inspection is also important to identify signs of wear or corrosion. Fittings should be replaced if the flare is damaged or the threads are worn. Using the correct lubricant during installation can prolong the life of the fitting and ensure a reliable seal.

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B2B Procurement Guide

When purchasing flared screw-in fittings, B2B buyers should consider several factors. Material selection is crucial, as it affects the fitting's resistance to corrosion and pressure. Stainless steel is ideal for harsh environments, while brass is suitable for general-purpose applications. Buyers should also verify the flare angle and thread specifications to ensure compatibility with existing systems. Sourcing from reputable manufacturers guarantees quality and reliability. Bulk purchasing may offer cost savings, but buyers should balance quantity with storage and shelf-life considerations.

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