Navigating the world of hydraulic components can be tricky without some basic knowledge. Different regions have their own standards, and not all parts are interchangeable. Picking the wrong component can lead to issues like leaks and weak connections. Let’s break down the differences between two common types of fittings: NPT and JIC.
Standards to Know
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JIC Fittings
: These follow the SAE J514 and ISO 8434-2 standards. -
NPT Fittings
: These are based on the AMSE B1.20.1 standards.
It’s important to note that JIC fittings are sometimes confused with other types like SAE, AN, JIS, and Komatsu. But they’re not the same and can’t always be used in place of each other.
Thread Types
- NPT (National Pipe Tapered): As the name suggests, these have tapered threads. They angle at 1° 47’ from the center axis. The threads have a 60° angle between them.
- JIC: These threads are straight and run parallel to the fitting’s axis. They follow the SAE – J512 standard and can be coarse, fine, or extra-fine.
While you might be able to fit a male NPT into a female JIC, it’s not a good idea. The tapered design of the NPT means they won’t lock together properly.
Flare Design
Both NPT and JIC fittings have chamfered ends to help them seal better. But they differ in their flare angles:
- JIC: Has a 37° flare angle.
- NPT: Has a 30° chamfer angle to fit with a NPT 30° Female swivel(NPSM) fittings.
JIC’s design allows it to seal better and handle higher pressures. Other standards, like Komatsu, have their own unique flare angles, making them distinct from JIC.
Which One to Choose?
NPT fittings are common and come in many varieties. They’ve been around for a long time, but they haven’t changed much. They’re easy to find, but they might not be the best for high-pressure situations. On the other hand, JIC fittings offer better sealing and can handle more pressure. So, think about your needs and the pressure levels you’re dealing with before making a choice.
In summary, when dealing with hydraulic components, it’s crucial to know the differences between NPT and JIC fittings. Choosing the right one ensures safety and efficiency in your hydraulic systems.
