Recommended hole size for dowel pins

ANSI ASME Dowel Pin Size Chart

All dimensions are in inches.
Click on image to enlarge a Nonpreferred sizes, not recommended for use in new designs b Lengths increase in 1/16-inch steps up to 3/8 inch, in 1/8-inch steps from 3/8 inch to 1 inch, in 1/4-inch steps from 1 inch to 2 1/2 inches, and in 1/2-inch steps above 2 1/2 inches. Tolerance on length is ± 0.010 inch. c These press hole sizes have been commonly used for press fitting Standard Series machine dowel pins into materials such as mild steels and cast iron. In other materials, such as aluminum or zinc die castings, hole size limits are usually decreased by 0.0005 inch to increase the interfearance of the press fit. Related:

American National Standard Hardened Ground Machine Dowel Pins ANSI/ASME B18.8.2

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