How Do I Know Which Hoses and Fittings Are Right When Replacing a Hydraulic Hose Assembly?

How Do I Know Which Hoses and Fittings Are Right When Replacing a Hydraulic Hose Assembly?

November 12, 2020

Your hydraulic system comes with hoses, and when it’s time to replace them, you must be sure to get the right one for your specific assembly. That means choosing the right hoses and fittings from hundreds of hose models and thousands of fittings. Things have become more complicated as manufacturers make hydraulic hose assemblies in San Jose, CA smaller, designed to fit into tight spaces.

Here’s how to tell which hoses are right for your hose assembly:

  • Look for the ID or dash size: Hoses are measured by the inside diameter (ID), also known as the dash size. The sizes are measured by sixteenths of an inch, but you probably won’t need to measure the hose itself—it’s usually printed on the layline of the hose. Knowing the ID will help you pick the right hose velocity.
  • Factor in the fluid and ambient temperature: The next way to narrow down your hose selection is to factor in the fluid temperature versus the ambient temperature where the hose assembly will be located. Pick a hose that exceeds the temperature rating of whichever temperature is higher. (Some fluids will have different temperature ratings, so keep this in mind when you’re selecting a hose.)
  • Consider what the assembly is used for: The way you use your hose assembly will determine which industry standard applies, like size, tolerances, construction type and more.
  • Check maximum pressure ratings: When you’re choosing a hose, pick one that can handle surges or spikes in your hydraulic pressure—otherwise, you could be dealing with burst hoses at a critical moment.
  • Decide whether abrasion or media compatibility is a concern: Finally, consider whether abrasion (hoses rubbing against each other or other objects) and media compatibility (if the fluid in the hose will work with the materials and fittings) are a concern—this will help you choose a hose that can handle your special requirements.


Finally, you’ll need to choose your hose fittings. Naturally, you’ll need to choose a fitting that works with the hose you selected. Otherwise, your hydraulic assembly runs the risk of leaks.

There are two broad categories of fittings: permanently attached, which are crimped onto the hose, and field attachable, which screw or clamp onto the hose.

You’ll also need to choose your thread type, which include North American, French Gas, German DIN, Japanese and British Standard Pipe. Be sure you understand how to install and assemble each different kind of thread and fitting type to prevent leaks.

Choosing the right hoses and fittings is the key to your project’s success. Although there are thousands of combinations to choose from, you can narrow down your selection by following these tips. When you need help figuring out how to make a hydraulic hose assembly in San Jose, CA, Royal Brass Incorporated can help. Our knowledgeable staff can help you select the right parts and track down anything that may be hard to find. We have nearly 70 years of experience and are prepared to put our expertise to work for you. Call us today!

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