CONCENTRICITY OF CASTINGS

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 & Estimating: (651) 312-4734 email

Directions

Use Good Design Principles

1. St. Paul Foundry is providing this information on metal characteristics for informational purposes only. Before making a final decision on alloy selection consider the following and all other appropriate design and specification principles. Please note that this is not an exhaustive list.

2. Consult the appropriate specification from an accredited specifying body (ASTM, SAE, Federal or Military) to determine current minimum values of this alloy.

3. Use appropriate design safety factors.

4. Use Failure Modes and Effects Analysis to help identify possible weaknesses in designs and specifications.

5. Use computerized stress analysis tools.

6. Use appropriate certification requirements for your casting suppliers. These may include test bars, chemical certifications, radiography, dye penetrant or other non-destructive testing methods.

7. Test your design to failure in a controlled environment. Then test it to failure in a simulation of its end use.

8. You and you alone are responsible for the suitability of your design and the materials that you select.

Disclaimer

WHILE EVERY EFFORT IS MADE BY ST. PAUL FOUNDRY (SPF) TO ENSURE ACCURACY, THIS INFORMATION IS PROVIDED FOR GENERAL INFORMATION PURPOSES ONLY AND NOT FOR ANY OTHER PURPOSE. BY ACCESSING THIS INFORMATION, YOU AGREE THAT IT MAY BE REVISED AT ANY TIME, IT IS PROVIDED “AS IS” AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, THAT NO WARRANTY OR REPRESENTATION IS MADE ABOUT ITS CONTENT OR SUITABILITY FOR ANY PURPOSE, AND THAT SPF EXPRESSLY DISCLAIMS WARRANTIES OF MERCHANTABILITY AND FITNESS. YOU ASSUME ALL RISK AND LIABILITY FOR ANY LOSS, DAMAGE, CLAIM, OR EXPENSE RESULTING FROM YOUR REVIEW, USE, OR POSSESSION OF THIS INFORMATION.

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