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Large engineering firms often subscribe to standards libraries (e.g., IHS Markit, Techstreet). Check if your company already holds a license to JIS G 3193.
A key aspect is the flatness tolerance. For this product, with both width and length under 2000 mm and a thickness of 80 mm (which falls in the 80 mm to 150 mm range), the permitted flatness is 8 mm according to the relevant table. jis g 3193 pdf