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Table 303<br />
Standard Tap Dimensions<br />
Nominal Diameter Nominal Nominal Tap Dimensions- Inches<br />
Range-Inches Fractional Metric Overall Thread Square Shank Size of<br />
Over To (Incl.)<br />
Diameter Diameter Length Length Length Diameter Square<br />
Inches Millimeters A B C D E<br />
3.135 3.260 3.1/4 M80 5.3/4 2 1.1/2 2.100 1.575<br />
3.260 3.385 3.3/8 5.3/4 2 1.1/2 2.100 1.575<br />
3.385 3.510 3.1/2 5.3/4 2 1.1/2 2.100 1.575<br />
3.510 3.635 3.5/8 M90 6 2 1.3/4 2.100 1.575<br />
3.635 3.760 3.3/4 6 2 1.3/4 2.100 1.575<br />
3.760 3.88S 3.7/8 6 2 1.3/4 2.100 1.575<br />
3.885 4.010 4 M100 6 2 1.3/4 2.100 1.575<br />
Table 303<br />
Notes<br />
For tolerances see Table 302<br />
For standard thread limits and tolerances for Unified Inch Screw Threads see Tables 327A<br />
For standard thread limits and tolerances for Metric Threads see Tables 337 and 341<br />
For eccentricity tolerances of tap elements see Table 317<br />
V 1.0 – November 2011 Page 161
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