High Pressure Washer Hose Fittings: A Complete Guide to Sizes and Types

Introduction

In industrial cleaning, high pressure washers are essential equipment, and the hoses connecting the washer to the spray gun, along with their fittings, directly impact safety and efficiency. This article explains common fitting sizes for different pressure ratings to help you make the right choice.

Below 500 BAR: Quick-Connect Fittings

For washers operating under 500 BAR, quick-connect fittings are typically used due to their ease of installation and fast operation, making them ideal for frequent tool changes. Common sizes include:

• M22: Metric thread, 22mm diameter, the most common size for home and commercial washers.
• M18: 18mm diameter, suitable for medium-pressure washers.
• 3/8": Imperial size, often found on imported equipment.

Above 500 BAR: Industrial-Grade Threaded Fittings

When pressure exceeds 500 BAR, quick-connect fittings cannot withstand such high forces. Instead, more robust, better-sealing industrial threaded fittings are required. These typically feature a conical sealing surface to ensure a leak-proof connection under extreme pressure. Common sizes include:

• M22 x 1.5: Metric fine thread, often used in ultra-high pressure washers.
• M18 x 1.5: Medium size, suitable for high-pressure systems.
• M20 x 1.5: Another common option.
• M16 x 1.5: Smaller size for specific equipment.
• M14 x 1.5: Miniature high-pressure fitting.
• G 3/8": Imperial pipe thread with sealing face.
• ZG 1/2": Tapered pipe thread with excellent sealing performance.

Important Considerations and Custom Services

Note that different manufacturers may use different fitting sizes, and even models within the same brand can vary. Always verify the original fitting size before purchasing or replacing hoses.

As a professional marine supplier, we understand the importance of proper fitting selection. We offer custom high-pressure fittings tailored to your equipment model. We also provide custom adapters to convert between different hose and fitting sizes, ensuring your equipment works seamlessly in any situation.

Conclusion

Choosing the correct high pressure washer fittings is crucial for safe and efficient operation. If you have any questions about sizing or need assistance, feel free to contact us for expert technical support and custom solutions.