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Size buildup of manganese phosphate plating on G2 CAST IRON

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Hello,
My name is Buzz,I work for a precision machining co. in PA.WE have a new job we need some help with. We're machining G2 Cast Iron (hardened & tempered to 250-300 BHN).It is cylindrical in shape (8.5" long x 2.5" O.D. x 1.7500"-1.7510" dia. bore after plating). How much size buildup should we allow for from the manganese phosphate plating to hold the close tolerance bore?
Any help would be greatly appreciated.
Thanks,

Buzz Ponitz
Precision machining - New Stanton, PA, U.S.A.

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