What is meant by the designation M20 2.5-6g6g? (What does the mean?)

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What is meant by the designation M20 × 2.5-6g6g? (What does the "×" mean?)
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Materials and process in manufacturing

ISBN: 978-0471656531

9th edition

Authors: E. Paul DeGarmo, J T. Black, Ronald A. Kohser

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