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Casting tolerancedepend on the casting material and the production method used. General tolerances for metal alloy castings are specified by the International Organization for Standardization in their standard ISO 8062 for SG cast iron castings, manufactured using machine-produced sand molds. Suitable grades are Casting Tolerance (CT) 8 to 12. The capabilities of our green sand plant allow us to provide CT8 grade castings. The hand-produced castings are CT9 rated. Closer tolerances may be available in certain cases.