These numbers are usually defined as oil weights. Six of them are recognized as winter grades with a “W” designation. The SAE classification (SAE J300) has proven 11 viscosity grades. Single Grade or Straight Weight OilĪ single grade oil does not contain viscosity modifier or polymeric viscosity index improver.
![hydraulic oil viscosity chart hydraulic oil viscosity chart](https://faq.f650.com/FAQs/Photos/EnginePhotos/oil-chart.gif)
With that said, there are two viscosity types: one for cold temperature performance and the other one for high-temperature performance. Later on, oil additive technology was introduced by the manufacturers that allow engine oil viscosity to thin at a slower rate. The initial viscosities were all single, such as SAE 30. Although gear oils and engine oils use different SAE numbering systems, the viscosities that the two systems specify overlap. However, this is not the same as the similar SAE system for engine oil viscosity, SAE J300. For many years now the viscosity of lubricating oils for motor vehicles has been specified almost universally by the SAE system.įor automotive gear oils, the specification is referred to as SAE J306.
Hydraulic oil viscosity chart code#
SAE established the grading system, which includes a numerical code system. As earlier mentioned, SAE stands for Society of Automotive Engineers. The higher the number, the thicker is the oil. Numbers you find on different oil cans, such as SAE 30 or SAE 10W-30, are viscosity or weight numbers that indicate the thickness of the oil.
![hydraulic oil viscosity chart hydraulic oil viscosity chart](https://www.eaton.com/content/dam/eaton/hydraulics/pumps/selecting-fluids-for-hydraulic-pumps-fig-3.png)
You can easily predict the behavior as well as the design of a mechanical system if you have detailed knowledge of oil viscosity. One of the factors that affect viscosity is the operating surface. Oil viscosity differs from one lubricant to another with respect to temperature. Thicker oils have more resistance to shearing and losing film strength at higher temperatures. The higher the number, the thicker the oil and vice versa. The numbers are commonly assigned in ranges of 5, 10, 20, 30, 40, and 50. The ability to flow is most often selected by the Society of Automotive Engineers (SAE) numbers. Motor oil viscosity is a common term we need to understand completely, and it refers to the ability of an oil to flow. Oil viscosity is graded by measuring the time it takes for a standard amount of oil to flow. It changes with temperature, shear rate, pressure, and thickness. When it comes to being thick, the equipment might have a hard time to start and could lead to problems such as cavitation.Oil viscosity is the parameter that plays an important role in lubrication. Once again, when the viscosity index (V.I.) is low and the fluid is too thin, users might see a problem such as overheating. Remember that it’s important to use hydraulic fluid with the recommended viscosity when you are running your equipment. The ideas oil for most purposes is one that maintains a stable viscosity throughout temperature changes. The hydraulic oil becomes thin at high temperatures and thick at low temperatures.
![hydraulic oil viscosity chart hydraulic oil viscosity chart](https://ktihydraulicsinc.com/wp-content/uploads/2018/02/Oil-Viscosities-1024x667.jpg)
Low viscosity index signified a large change of viscosity with changes of temperature. Choosing the right viscosity fluid is important because it ensures the equipment’s performance. Second, consider the severity of the cycle of duty, and lastly, know what temperatures the equipment will experience while it is in use. To help make your choice, determine the type of equipment where you will use the fluid. You need to pay attention to your equipment’s requirements, recommendations and specifications. In return, this can help your engine perform consistently at different temperature ranges.īut selecting the right hydraulic oil for your engine is not that easy. Great hydraulic oils with the highest viscosity remains stable and doesn’t vary much over a wide temperature range. If you have an engine that is dependent on hydraulic oil, then this article is for you in order to know more about hydraulic oil viscosity. Usually, mineral-oil fluids in hydraulic have viscosity index of around 100, although products range from below 100 to 200. When the viscosity index is greater, the smaller the change in fluid viscosity will be and vice versa. Viscosity index is a number that indicates the viscosity of a hydraulic oil change with temperature.