While similar, these standards have slight differences in specimen dimensions and pulling speeds. JIS K 6251 is the preferred standard when working with Japanese manufacturers or for products entering the Japanese market. 1 and No. 3 as defined in the standard?

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The standard has undergone several revisions to maintain technical relevance:

Disclaimer: This post is for informational purposes. Always refer to the official standard document for certified testing.

If your lab follows JIS K 6251, your results will generally be recognized in international markets.