how are hydraulic hoses measured


How Are Hydraulic Hoses Measured?


Hydraulic hoses are vital components in various industrial applications, especially in hydraulic systems, where they transmit pressurized fluids to enable the movement of machinery. These hoses are available in different sizes and dimensions to suit specific requirements. However, understanding how hydraulic hoses are measured is crucial for selecting the appropriate size and ensuring optimal system performance. In this article, we will delve into the intricacies of measuring hydraulic hoses, exploring various aspects such as sizing methods, important measurements, and industry standards.

I. Sizing Methods for Hydraulic Hoses:

Hydraulic hoses can be measured in multiple ways, each serving a unique purpose. Let's explore two common sizing methods:

A. Inside Diameter (ID):

The inside diameter of a hydraulic hose refers to the measurement of the innermost part of the hose. It determines the volume of fluid that can flow through the hose. The ID is typically specified in inches or millimeters and is a crucial parameter for selecting the hose size based on flow requirements.

B. Outside Diameter (OD):

The outside diameter of a hydraulic hose represents the measurement of the hose's outermost part. It helps determine the hose's compatibility with fittings, routing, and installation requirements. OD is also essential for selecting the correct hose clamps or connectors that ensure secure connections within the hydraulic system.

II. Important Measurements for Hydraulic Hoses:

Apart from inside and outside diameters, other vital measurements play a significant role in determining hose performance. Let's explore a few key measurements to consider:

A. Burst Pressure:

Burst pressure refers to the maximum internal pressure a hydraulic hose can withstand before failing. It is a crucial safety consideration to ensure the hose can handle unexpected surges or system malfunctions. Burst pressure is typically measured in pounds per square inch (PSI) or megapascals (MPa). Manufacturers provide specific ratings for their hoses to ensure they are used within safe operating limits.

B. Working Pressure:

Working pressure relates to the recommended maximum pressure limit for a hydraulic hose during normal operations. Exceeding the working pressure can lead to hose failure or compromised system performance. Like burst pressure, working pressure is also expressed in PSI or MPa and must be considered when selecting hoses for specific applications.

C. Bend Radius:

Bend radius signifies the minimum curvature that a hydraulic hose can withstand without kinking or deforming. It is measured as the distance from the center of the bend to the innermost part of the hose. Selecting hoses with appropriate bend radii is crucial to prevent flow restrictions, premature hose failure, or reduced system efficiency due to excessive bending.

III. Industry Standards for Hydraulic Hose Measurements:

To ensure consistency and compatibility across different hydraulic systems and manufacturers, several industry standards govern hydraulic hose measurements. Here are a few notable standards:

A. Society of Automotive Engineers (SAE) Standards:

SAE sets standards for hydraulic hoses in various industries, including automotive and aerospace. SAE standards classify hoses based on their working pressures, temperature ranges, and constructions, providing manufacturers and users with a reliable framework for hose selection.

B. International Organization for Standardization (ISO) Standards:

ISO standards encompass a wide range of applications, offering guidelines and specifications for hydraulic hoses used globally. These standards ensure interchangeability and compatibility between different hydraulic components manufactured by various companies worldwide.

C. European Norm (EN) Standards:

EN standards are specific to Europe and are widely used to regulate the performance and quality of hydraulic hoses. These standards focus on aspects such as hose dimensions, electrical properties, and fire resistance, ensuring safe and reliable hydraulic systems.


Understanding how hydraulic hoses are measured is crucial when selecting the appropriate size and type for your hydraulic system. Various measurements like inside diameter, outside diameter, burst pressure, working pressure, and bend radius play significant roles in determining hose performance and compatibility. Adhering to industry standards such as SAE, ISO, and EN ensures reliability and compatibility across different systems. By considering these measurements and adhering to standards, you can optimize the performance and longevity of your hydraulic systems while ensuring safety.


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