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Machine Dowel Pins Chart ANSI ASME

ANSI ASME Hardware Guide

Dowel Pin Slip and Press Fit Installation Tolerance Chart

The following chart is of Machine Dowel Pins Chart per. ANSI ASME B18.8.2

ANSI ground machine dowel pins (hardened) are furnished in two diameter series: Standard Series having basic diameters 0.0002 inch over the nominal diameter, intended for initial installations; and Oversize Series having basic diameters 0.001 inch over the nominal diameter, intended for replacement use.

All dimensions are in inches.
Click on image to enlarge

ANSI ASME Dowel Pin Size Chart

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.


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