Hydraulic hoses are among the most important components of many machines, carrying fluid from one part to another. In these hoses, hydraulic fluid moves at very high pressure; that’s why they must be strong enough to handle it. But when you start looking for high-pressure hydraulic fluid, you will come across 4SP and 4SH hoses. Both of these have four layers of spiral steel wire inside them. That’s what makes many people think that they are the same. But in reality, there is a huge difference between 4SP and 4SH hoses. So, how do you know which one is right for your application? Worry not! In this guide, I will compare 4SP and 4SH hoses head-to-head. So let’s get started.
Overview of 4SP and 4SH Hoses
Before differentiating these two hoses, let’s first understand their basics.
A 4SP hose is a four-spiral steel-wire-reinforced hose designed for high-pressure applications. The name “4SP” describes the hose type. However, the number 4 refers to its four spiral layers of steel wire reinforcement. These layers are placed around the inner tube and work like a strong support structure.
Now, when high-pressure fluid pushes against the inner side of the 4SP hose, these layers help it withstand that pressure. However, there are not just four layers. Instead, it also contains an inner tube, four spiral reinforcement layers, and an outer cover. All these parts together make it reliable in equipment where pressure is high. You can often find 4SP hoses in construction, agriculture, and industrial machinery.
A 4SH hose is a heavy-duty, four-spiral steel-wire-reinforced hydraulic hose. Like 4SP, it has four layers of spiral steel wire around the inner tube. These layers give the hose the strength to deal with very high hydraulic pressure. However, the main point is that 4SH is a higher-pressure hose type than 4SP.
So we can say that the basics of the 4SH are just like 4SP hoses. For example, it has four spiral layers, an inner tube, and an outer cover. However, the design and performance requirements of the 4SH are what make it more reliable for heavy-duty operation. For example, there are large machines that use hydraulic cylinders and motors and require a high flow of pressurized fluid. In such situations, a 4SH hose will provide the pressure-handling ability.
Key Difference Between 4SP and 4SH Hoses
Now you have a basic understanding of 4SP and 4SH hoses. Right? But many still think that they are alike as they contain four spiral layers. However, that’s a misconception. To make things clear, here are the key differences between the two hydraulic hoses.
1- Construction and Design
The first major difference between 4SP and 4SH lies in their overall construction. No doubt their basic construction is quite similar. Both are made from an inner rubber tube, four spiral layers of steel wire, and an outer protective cover. However, 4SP and 4SH are separate hose types under the EN 856 standard.
That’s why their construction is designed around different levels of hydraulic service. For example, if you look at the 4SH hose, it is designed for heavier-duty construction. It is meant for more demanding services. However, 4SP is also designed for heavy-duty construction but not as heavily as 4SH. This means you cannot assume that two hoses with four spiral layers will have the same construction.
2- Steel Wire Reinforcement & Pressure Capacity
Another important part of both 4SP and 4SH hoses is steel wire reinforcement. Both 4SP and 4SH have four spiral layers of steel wire. So the difference is not the number of layers. The important difference is that they are made to different performance requirements. In general, 4SH is designed for higher-pressure hydraulic service than 4SP.
This makes 4SH a more reliable choice for systems that place greater pressure demands on the hose. But now, when we discuss pressure capacity or rating, there is no single fixed rating for either hose. The rated pressure varies with hose size and can also differ between manufacturers. For example, a small-diameter PVC hose might have a much higher working-pressure rating than a larger hose of the same type.
3- Wall Thickness & Outer Diameter
The wall thickness is the distance between the inside of the hose and its outside surface. The total width of the hose, from one outer edge to the other, is the outer diameter. Both 4SH and 4SP vary in both of these terms. In many cases, a 4SH hose has a heavier-duty overall construction.
However, it is not right to say that a 4SH hose will always have a thicker wall or larger outside diameter than every 4SP hose. This depends on the manufacturer and the specific hose design. These two differences become important when you are replacing one hose with another. Even if a 4SP and a 4SH hose have the same nominal inside size, their outside dimensions may differ. A larger outside diameter can require more space, which can affect replacement.
4- Flexibility and Bend Radius
Now it comes to flexibility and bend radius, where both 4SH and 4SP show clear differences. Flexibility means how easily a hose can bend. However, the bend radius indicates how tightly it can be bent without damage. In general, 4SP hoses are more flexible than 4SH hoses. At the same time, they have a smaller minimum bend radius.
It means 4SP hoses can usually be routed through tighter spaces more easily without the risk of damage. On the flip side, 4SH hoses are generally more rigid, like industrial hoses, because they are designed for heavier-duty use. As a result, they have a larger minimum bend radius and require more bending space than a comparable 4SP hose.
Quick Highlight: When comparing 4SP and 4SH, never think that every 4SH hose is less flexible than every 4SP hose. The actual bend radius is specified for each hose size and model. That’s why, before installation, always check the manufacturer’s specified minimum bend radius.
5- Weight and Handling
Weight is another practical difference between 4SP and 4SH hoses. Remember, a hydraulic hose is not only carried during installation. It also needs to be moved, positioned, connected, or replaced during machine maintenance. So weight and handling become important when choosing between these two hoses. As I mentioned above, 4SH is designed for demanding, high-pressure applications.
For these reasons, these hoses are heavier than 4SP hoses. The steel reinforcement and overall construction contribute to this added weight. Due to their added weight, it can sometimes be difficult to lift, position, and route 4SH hoses. On the other hand, 4SP hoses are slightly lighter due to their construction. This directly makes their installation, routing, and replacement easier.
6- Best Use Cases & Common Applications
4SP and 4SH hoses are both used in high-pressure hydraulic systems. However, it does not mean you can choose them for the same situations. As you can see, there is a huge difference in their weight, handling, size, and dimensions, so their usability changes. For example, 4SP hoses are used in:
- Construction equipment like excavators, loaders
- Agricultural machinery (tractors, harvesters)
- Hydraulic power units
- General high-pressure hydraulic systems
On the flip side, 4SH is best suited for equipment operating under particularly demanding conditions. You can often find it in:
- Heavy construction equipment such as large excavators
- Mining equipment
- Heavy industrial machinery
- Heavy-duty mobile equipment
7- Cost and Affordability
Last but not least, cost is another area where both 4SH and 4SP show a distinct difference. Remember, the price of a hydraulic hose depends on factors such as its size, length, materials, fittings, and manufacturer. Generally, 4SH hoses cost more than comparable 4SP hoses. Why? The first major reason is their construction. They are made for more demanding, higher-pressure service.
Making such hoses requires more time, effort, and careful testing and inspection, which increases the overall cost. In contrast, 4SP hoses are a more economical choice. Their construction is not very demanding, which reduces their overall cost to some extent. However, keep in mind that choosing a hose only because it is cheaper can cause problems. Suppose the hydraulic system requires the performance of a 4SH hose. But in this case, you use a 4SP option to reduce the initial cost. It will definitely lead to premature wear, leakage, or hose failure.
4SP vs 4SH: Which Hose Should You Choose?
There is no single best choice between 4SH and 4SP hoses. The ultimate choice depends on what you need.
Choose 4SP for your hydraulic system when you need a high-pressure hose. Its pressure rating is enough for the job. However, when the system needs a higher-pressure hose for more demanding work, you should go for 4SH hoses. However, the pressure is not the only thing to check. Along with pressure, you must also consider hose size, temperature, hydraulic fluid, bend radius, and other factors.
From the differences discussed, you can see that each hose type has its own specifications. If your machine can safely work with a correctly rated 4SP hose, there is usually no need to choose a 4SH hose. A 4SP hose can be a practical and more affordable option for many high-pressure hydraulic applications.
However, if the system operates at pressures that require a 4SH hose, you must choose it. If you choose 4SP just to save money, it is not a good idea because the hose may not be suitable for the job. So before making the final choice, check the manufacturer’s specifications for the exact hose size and model. Next, compare its pressure, size, fluid compatibility, and bend radius with your machine’s needs.
Conclusion
When you are searching for hoses, 4SP and 4SH hoses may look very similar. The reason is their equal four spiral layers. However, if we look more closely, you will realize there are several differences between these two hoses. 4SH is generally designed for higher pressure and more demanding work. However, 4SP is commonly used for high-pressure applications where its rated capacity is enough.
With all that, their flexibility, dimensions, weight, applications, and cost can also differ. So when choosing, keep in mind that it is not about choosing a hose just because it looks stronger or costs more. A good hydraulic hose matches the machine it will be used on. So compare the hose specifications with your machine requirements and choose the most reliable hose.