M18x1,5 Thread – dimensions, application and characteristics

The M18x1,5 thread is a precision metric fine-pitch thread that is widely used in power hydraulics, pneumatics, automotive, and the machine industry. The M18x1,5 designation means that the thread has a nominal diameter of 18 mm and a thread pitch of 1,5 mm. This design ensures high connection tightness, resistance to vibrations, and stability under heavy pressure loads.

The M18x1,5 thread belongs to the group of fine-pitch threads, which are used wherever precise fitting and a tight connection are required. In hydraulic and pneumatic systems, it ensures safe and durable connections of working elements, guaranteeing the reliability of the entire system.

Characteristic features of the M18x1,5 thread

The M18x1,5 thread is characterized by:

• outer diameter in the range of approx. 17,6–17,9 mm,

• inner diameter approx. 16,2–16,6 mm,

• thread pitch equal to 1,5 mm.

Thanks to the fine pitch of the M18x1,5 thread, a very tight connection is achieved, which is perfect for high operating pressures and in places exposed to vibrations. This thread ensures assembly certainty and stability even in difficult working conditions, such as hydraulic systems of construction, agricultural, or industrial machinery.

Application of the M18x1,5 thread

The M18x1,5 thread is used in many types of connections, both in steel structures and in hydraulic fitting elements. It is most commonly found in:

• fittings and ends for hydraulic hoses,

• adapters and reductions,

• technical plugs and caps,

• pressure sensors and fuel lines,

• high-pressure pneumatic and hydraulic installations,

• industrial and automotive equipment.

Due to its high precision and mechanical strength, the M18x1,5 thread is one of the most frequently used in modern power hydraulic systems.

Related threads – smaller and larger

The M18x1,5 thread is located between two other popular sizes:

• Smaller thread: M16x1,5

• Larger thread: M20x1,5

This allows for easy matching of appropriate adapters, reducers, or differential connectors depending on the installation requirements.

M18x1,5 thread products available in the Hydron store

A wide range of elements with M18x1,5 threads is available in the Hydron online store, such as:

• ends for hydraulic hoses,

• steel and stainless steel fittings,

• couplers, bushings and elbows,

• plugs and caps,

• nuts, locknuts and AA connectors.

Each product is made of materials resistant to corrosion, high pressures and variable temperatures, which guarantees long-term operation and safety of use.