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St. Paul Foundry

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ISO 9001:2015*



Concentricity is the position of two or more cylindrical surfaces (A and B) in respect to a common axis. Concentricity tolerance is one half the difference in the diameters of a cylindrical tolerance zone about which axis the feature so toleranced must lie.

Concentricity of cylindrical surfaces is affected by the design of the casting. Factors involved include the size, wall thickness, shape and complexity of the casting.

This standard applies to castings having maximum rigidity and uniformity of shape and wall thickness. Under these conditions castings may be slightly out-of-round but this ovality is included in the concentricity tolerances. Castings containing inserts are not covered by this standard. Concentricity tolerances will only apply when specified on the drawing.

For surfaces in fixed relationship in one mold section
Sand Permanent Mold
Up to 5 in. dia. +- 0.050 +- 0.025
Additional over 5 in dia. +- 0.005 +- 0.003

St. Paul Foundry
954 Minnehaha Avenue West
Saint Paul, Minnesota 55104
(651) 488-5567  Fax: (651) 488-0908
Sales: (651) 312-4734 email

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 Orion Registrar Inc. Registered to AS9100D(2016) and ISO 9001:2015  Defense Logistics Agency, Joint Certification Program, United States and Canada American Foundry Society Corporate Member