Dash Size (Learning Chart)
A dash size chart is used to identify the size of fittings and hoses in a hydraulic system. The “dash size” refers to the measurement of the inside diameter (ID) of the hose or fitting in sixteenths of an inch. For example, a -6 fitting has an ID of 6/16″, or 3/8″. The chart is typically organized by dash size and lists the corresponding hose or fitting size.
It’s very important to use the correct size and type of hose and fittings for your hydraulic system. Using the wrong size can cause leaks, reduced efficiency, and even equipment failure. A dash size chart can be a valuable tool to ensure that the correct size and type of components are selected for a particular application.
| Dash | Inches |
| -2 | 1/8 |
| -3 | 3/16 |
| -4 | 1/4 |
| -5 | 5/16 |
| -6 | 3/8 |
| -8 | 1/2 |
| -10 | 5/8 |
| -12 | 3/4 |
| -14 | 7/8 |
| -16 | 1 |
| -20 | 1-1/4 |
| -24 | 1-1/2 |
| -32 | 2 |
The importance of using the correct hose and fitting size in a hydraulic system cannot be overstated. Improper sizing can lead to a variety of issues that can negatively impact the performance and longevity of the system.
First and foremost, using the wrong size hose or fitting can cause leaks. This can lead to a loss of fluid, which can in turn reduce the efficiency of the system and make it more difficult to maintain the correct pressure. Leaks can also lead to the introduction of contaminants into the system, which can cause damage to the equipment and shorten its lifespan. In addition, if a leak is not addressed in a timely manner, it can result in a complete failure of the system.
Another issue caused by using the wrong size hose or fitting is reduced efficiency. Hoses that are too small for a particular application will not be able to handle the correct flow of fluid, resulting in increased pressure drop and a reduction in system performance. Similarly, fittings that are too small will not provide an adequate seal, also resulting in pressure drop and reduced efficiency.
Finally, using the wrong size hose or fitting can also lead to equipment failure. For example, hoses that are too small may not be able to handle the pressure and can burst, causing damage to the equipment and risking injury to personnel.
In summary, it is crucial to use the correct size and type of hose and fittings in a hydraulic system to ensure its safety, performance, and longevity. A dash size chart can be a useful tool to ensure that the correct size and type of components are selected for a particular application.