Some trucks used the metric system of fasteners while some cars used both metric and SAE fasteners. So, you don’t need to buy SAE tools to accomplish your most jobs. ​This is the reason, I mostly recommend filling up your socket set with metric tools and then choose any SAE tools if you think you need to.

The agency has decided to use metric units for all operations on the lunar surface, according to a statement released today. The change will standardize parts and tools. It means Russian wrenches could be used to fix an air leak in a U.S.-built habitat.

NASA claims its costs to convert its measurement systems would be over $370 million.

GM and other American car companies use metric on all new bolt applications. However, they still use S.A.E.

SAE is commonly used in North America to indicate United States customary units (USCS or USC) measuring systems in automotive and construction tools. SAE is used as a tool marking to indicate that they are not metric (SI) based tools, as the two systems are incompatible.

American cars are built with all metric parts. There are no SAE fasteners in US cars anymore and has been that way for many years. So the answer to your question in specific would be that American cars built in other countries will have metric fasteners.

In 1824 the British adapted the Imperial measure in which the gallon is based on 10 pounds or 277.42 cubic inches of water. As a result, the U.S. gallon is 83.3 per cent of the Imperial gallon; put it another way, the Imperial gallon is about one-fifth or 20 per cent greater in volume than the American gallon.

Why car engines are measured in litres? Car engines are measured in litres because litre is the commonly accepted unit of measuring volume.

According to the U.S. Central Intelligence Agency’s online The World Factbook (2016), the only countries that have not adopted the metric system are Myanmar (also known as Burma), Liberia and the United States.