Table of Contents

Hydraulic hose may seem an insignificant part of a hydraulic machine, but in reality, it plays an indispensable role in ensuring seamless function and longevity.

Wire Spiral Hose EN8564SH(DIN200234SH)
Wire Spiral Hose EN8564SH(DIN200234SH)

Understanding Hydraulic Hoses

Hydraulic hoses are essential components of any hydraulic system, facilitating fluid movement and subsequently generating the power needed to operate various machines. However, their selection and assembly are not as straightforward as they may seem. One must understand their application and assembly to select the perfect hydraulic hose for their system.

Application and Assembly

Choosing a new hydraulic hose assembly requires a specific consideration of its application. A widely accepted standard in this process is the STAMPED method, an acronym representing Size, Temperature, Application, Material, Pressure, Ends, and Delivery.

Importance of Size

When we talk about the importance of size in the STAMPED method, we’re referring primarily to the internal diameter (ID), external diameter (OD), and length of the hydraulic hose.

Sizing Your Hose

The Internal Diameter

The internal diameter of a hose is crucial. For instance, an undersized hose increases the energy required to push fluid through, wasting precious energy that could have been used to move your load.

External Diameter

The external diameter, too, has its significance. Hoses with higher pressure capacity, such as a six-wire spiral hose, will have a larger external diameter due to the additional layers.


Length is another significant factor, as longer hoses require more energy to move fluid, leading to increased pressure drop.

The Impact of Incorrect Sizing

The Energy Aspect

Imagine you have a half-inch, 20 feet long hose with 20 gpm flowing through it. The pressure drop from moving the fluid alone can be around 350 psi. This energy gets wasted as heat and provides no function to your hydraulic system.

Loss of Force

In a 2,000 psi system, such a pressure drop could result in a loss of over 3,000 pounds of force. This vividly illustrates why correct sizing is essential.

Hose Measurement

Overall Length

The overall length measurement includes the length of the hose itself, along with the cutoff factor. However, it’s not from tip to tip of the hose but from fitting to fitting.

Hose Cut Length

The hose cut length is obtained by subtracting the cutoff length from the total length. This length takes into account the extra length required for the fittings.

Understanding the Cutoff Factor

The cutoff factor is the difference between where the hose is cut and the extra length required for the fittings. Not accounting for it may result in a hose that’s either too long or too short, affecting the assembly.

The Longevity of Hydraulic Hose

Incorrect sizing, improper assembly, or not considering the cutoff factor can shorten your hose’s lifespan.


The significance of hydraulic hoses in any hydraulic system is undeniable. Making the right choice when selecting and assembling a hose, considering factors like size, fitting choice, and cutoff factor, can drastically affect your system’s efficiency and the hose’s longevity.


  1. What does the STAMPED method stand for?
  2. How does an undersized hose impact a hydraulic system?
  3. What is the cutoff factor in a hydraulic hose?
  4. What is the significance of fitting choices in hose assembly?
  5. How does incorrect hose sizing affect its longevity?
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