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What does M mean on bolts?
Questioner:Carter Davis 2023-04-07 08:00:30
The most authoritative answer in 2024
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Declan Johnson——Works at the World Health Organization, Lives in Geneva, Switzerland.
As an expert in the field of mechanical engineering, I can tell you that the letter "M" on a bolt typically stands for "Metric." This indicates that the bolt conforms to the metric system of measurements, which is widely used internationally for industrial and manufacturing purposes. The metric system is based on units of measurement that are multiples of ten, making it easier to standardize and convert between different units.
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Julian Cooper——Works at the International Finance Corporation, Lives in Washington, D.C., USA.
The first number in a metric
bolt specification refers to the
bolt's nominal outer diameter. For example, a
bolt specified as "M6-1.0 x 30" fits a 6.0-mm diameter hole. The "M" indicates that it is a metric size.
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