What Is G1/4 Thread?

G1/4 thread is a very common thread type used in the plumbing and mechanical engineering industries. This metric thread is used to connect various water and air lines. It is used as the standard for water-cooled computer systems and other industries as well.

The G1/4 thread is popular because of its versatility and compatibility with many different applications. It allows for the easy connection and disconnection of components without having to completely disassemble the system. This thread can be found in various sizes and materials to meet the specific needs of different applications. Overall, G1/4 thread is commonly used because of its durability, reliability, and ease of use.

What is G1/4 Thread?

G1/4 thread is a standard thread size used in plumbing and various industrial applications. Here are some key points to understand this topic:

– G1/4 thread is a metric thread size that measures 1/4 inch in diameter and has a pitch of 19 threads per inch.
– The “G” in G1/4 stands for “German” and refers to the fact that this thread size is standardized by the German Institute for Standardization (DIN).
– G1/4 thread is commonly used in various components of liquid cooling systems for personal computers, such as radiator fittings, reservoirs, and waterblocks.
– G1/4 thread size can also be found in hydraulic systems, pneumatic systems, and other industrial applications that require pressure-tight seals.
– There are different types of G1/4 thread available, such as straight thread and tapered thread. The choice of thread type depends on the specific application and the type of fitting being used.
– When selecting G1/4 fittings or components, it’s important to ensure that they are compatible with the thread size and type, as well as the overall system requirements. This can help ensure proper fit, functionality, and performance.


1. What is a G1/4 thread?
– A G1/4 thread refers to a standard metric screw thread commonly used in computer cooling systems and other industrial applications.

2. How do I know if I have a G1/4 thread fitting?
– Look for the term “G1/4” or “1/4 BSP” on the product label or specification sheet to confirm if it uses a G1/4 thread.

3. What size is a G1/4 thread?
– The G1/4 thread has an outer diameter of 13.16mm and a pitch of 19 threads per inch (TPI).

4. What types of fittings use G1/4 threads?
– G1/4 threaded fittings are commonly used in water cooling systems, such as radiators, reservoirs, pumps, and blocks, as well as in other industrial applications like pressure gauges and vacuum valves.

5. Can I replace a G1/4 threaded fitting with a different thread size?
– No, a G1/4 thread is not interchangeable with other thread sizes, as the pitch and diameter are different. It’s important to match the thread size and type of fittings to ensure proper compatibility and prevent leaks.


In summary, a G1/4 thread is a type of thread commonly found in the plumbing and manufacturing industry. It is a metric thread size measurement and is used in a wide range of applications, including computer cooling systems and automotive engines. Understanding different thread sizes is crucial in ensuring a secure and tight connection between components. So, whether you are a DIY enthusiast or a professional, knowing the basics of G1/4 thread can help you choose the right tools and equipment for your project.

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