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What is the typical unit of measure for the pitch in ISO metric threads?

  1. Inches

  2. Millimeters

  3. Centimeters

  4. Feet

The correct answer is: Millimeters

The typical unit of measure for the pitch in ISO metric threads is expressed in millimeters. In the context of threaded fasteners, pitch refers to the distance from one thread to the next, measured along the length of the bolt or screw. ISO metric threads follow a standardized metric system, which is why they utilize millimeters as the unit of measurement for pitch, making it easier to specify and manufacture parts with precise dimensions that adhere to international standards. Using millimeters allows for more granular and accurate measurements, particularly in mechanical applications where precision is crucial. Inj industry, the pitch might be specified as a number, indicating how many millimeters are between adjacent threads, for example, a pitch of 1.5 mm means that each thread is 1.5 mm apart. In contrast, other units like inches, centimeters, or feet aren't used for this purpose, as they do not align with the metric system that ISO standards are based on.