Flared tube fittings, commonly referred to as JIC fittings, are integral to modern hydraulic and high-pressure systems where leak-free, reliable performance is non-negotiable. Accurate sizing and identification of fittings ensure safety and compatibility, preventing prolonged downtime. This guide shows how to identify, size, and apply Hy-Lok’s flared tube fittings in industrial settings.
Why JIC Fittings Are Standard in Hydraulic Systems
JIC flared fittings are standard in hydraulic systems for their high-pressure reliability and reusable connections. Hydraulic circuits often operate under high pressure and experience frequent spikes. The metal-to-metal 37° seal suits these conditions, as it does not rely on soft seals that degrade over time. Properly installed and tightened, JIC fittings remain reliable under pulsation, cycling, and demanding duty cycles.
They also strongly resist vibration and mechanical stress, common in mobile equipment and heavy machinery. The design allows for disassembly and reassembly for maintenance or system changes. Fittings do not need to be replaced if the sealing surfaces are undamaged. JIC fittings are used with manifold valves, pressure control systems, and other hydraulic controls.
How to Identify Flared Tube Fittings
Identifying flared fittings prevents leaks and mismatches. The key is the flare angle: JIC fittings use a 37° flare, not the 45° angle found with SAE flare fittings. Use a flare gauge for accuracy; don’t just rely on visual checks.
Each JIC size matches a specific thread and pitch, often measured in threads per inch (TPI). To identify that you have the right size, you must use an appropriate measuring tool like a calliper:
- Measure the male thread’s outer diameter or the female’s inner diameter,
- Check pitch by referencing the fitting chart that correlates tube size to the correct JIC thread dimensions.
JIC fittings use a metal-to-metal cone seal. Male ends have the outer cone; female ends have the inner.
Common mistakes include confusing 37° JIC with 45° SAE flare fittings, misreading threads, or assuming compatibility because fittings almost fit. Small differences in thread or angle prevent proper sealing, leading to leaks, galling, or damage. Incorrect identification often leads to leaks, torque issues, or premature failure under pressure.
How to Size Flared Tube Fittings Correctly
Correct sizing of flared tube fittings is key to your system’s integrity and long-term use.
- Start by measuring the outside diameter (OD) of the tube you will connect. Use a calliper tool for accuracy.
- Again, check thread size and pitch with gauges. Ensure the tube and fitting are compatible with the JIC. Match the fitting’s rating to your system’s maximum pressure and surges.
- Material selection also impacts sizing and specifications. Depending on the applications, you may require carbon steel, stainless steel, or brass for corrosion resistance, temperature resistance, or cleanliness.
Proper sizing is not just about fit; it must withstand pressure, remain media-compatible, and avoid costly rework or retrofits.
Compatibility with Existing Systems
A strength of the JIC flared tube fittings is their interchangeability among other brands and manufacturers. Systems using JIC standards can usually be maintained or repaired with equivalent JIC fittings, as long as all specifications, like size and pressure ratings, match. Hy-lok produces parts compatible with Swagelok and Parker components. This interchangeability reduces downtime and effort during system updates or optimization.
Compatibility is crucial during retrofits, maintenance, or repairs when components are already installed. Hy-Lok’s JIC-compatible fittings integrate easily, making supplier changes or part replacements simple. This is ideal for manufacturers seeking supply chain flexibility or enhanced local support without redesigning their entire hydraulic systems.
Why Choose Hy-Lok Canada for Flared Tube Fittings
Hy-Lok Canada flared tube fittings offer precision engineering, global manufacturing quality, and local support. Manufactured in ISO-certified facilities, Hy-Lok flared fittings deliver repeatable, leak-free performance. The design ensures interchangeability with major brands following the JIC 37° standard, aiding compatibility across multi-vendor systems.
Canadian customers benefit from Hy-Lok’s local inventory and support, resulting in faster lead times and better service. Our product range is suitable for a wide range of industries:
- High-pressure hydraulics
- Aerospace
- and other precision settings
Precision engineering, trusted compatibility, and local support with global quality make Hy-Lok Canada a reliable partner for flared tube fittings.
Discover Hy-Lok Canada’s full line of flared tube fittings and hydraulic connections. Take proactive steps to achieve precise, leak-free, and reliable systems. Contact Hy-Lok Canada now for expert technical support, precise sizing advice, or a fast quote. Choose us today to secure high-pressure, high-performance solutions for your operations.