What is the definition of SAE?
2 Answers
SAE is the abbreviation for the Society of Automotive Engineers in the United States, referring to the viscosity grade classification of gear oil. The following is relevant information about SAE: 1. Classification: Gear oil can be divided into single-grade viscosity type and multi-grade viscosity all-weather type. The single-grade viscosity type can be further divided into high-temperature type and low-temperature type. 2. Meaning: The high-temperature type is labeled similarly to SAE90, SAE140, etc. The number following SAE indicates the viscosity of the oil at 100°C, with a larger number indicating higher oil viscosity. The low-temperature type is labeled similarly to SAE75W, where W stands for winter (low-temperature type), 75 represents viscosity, and a smaller number indicates better low-temperature performance.
SAE stands for the Society of Automotive Engineers, an organization established in 1905 by a group of pioneering engineers with the goal of standardizing the development of the automotive industry. Back when I was learning to repair cars in my youth, SAE standards were like the Bible guiding our operations. For example, oil viscosity grades such as 10W-30—SAE standards dictate how fluid the oil should be in winter and how thick it should be in summer to protect the engine. Ignoring these rules often led to rapid engine wear or difficulty starting. They also set safety measures, like headlight brightness specifications, to reduce nighttime accidents. Thinking back to those days, SAE unified bolt sizes, enabling parts from different brands to be interchangeable and eliminating the chaos of mismatched vehicles. Today, SAE is involved in autonomous vehicle testing standards, ensuring the safe deployment of new technologies. In short, it's a longstanding institution that drives industry progress, making car repairs and driving more reliable.
